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Pam Bennett, Barb Bloetscher, Joe Boggs, Cindy Burskey, Jim Chatfield, Erik Draper, Dave Dyke
Gary Gao, David Goerig, Tim Malinich, Becky McCann, Amy Stone, and Curtis Young
Buckeye Yard and Garden onLine provides timely information about Ohio growing conditions, pest, disease, and cultural problems. Updated weekly between April and October, this information is useful for those who are managing a commercial nursery, garden center, or landscape business or someone who just wants to keep their yard looking good all summer.
Home BYGL BYGL Listing BYGL - June 25, 2009
BYGL - June 25, 2009 Print E-mail

This is the 12th 2009 edition of the Buckeye Yard and Garden Line (BYGL). BYGL is developed from a Tuesday morning conference call of Extension Educators, Specialists, and other contributors in Ohio.

BYGL is available via email, contact Cheryl Fischnich This e-mail address is being protected from spambots. You need JavaScript enabled to view it to subscribe. Additional Factsheet information on any of these articles may be found through the OSU fact sheet database http://plantfacts.osu.edu/ .

BYGL is a service of OSU Extension and is aided by major support from the ONLA (Ohio Nursery and Landscape Association) http://onla.org/ ; http://buckeyegardening.com/ to the OSU Extension Nursery, Landscape and Turf Team (ENLTT). Any materials in this newsletter may be reproduced for educational purposes providing the source is credited.

BYGL is available online at: http://bygl.osu.edu , a web site sponsored by the Ohio State University Department of Horticulture and Crop Sciences (HCS) as part of the "Horticulture in Virtual Perspective." The online version of BYGL has images associated with the articles and links to additional information.

Following are the participants in the June 23rd conference call: Pam Bennett (Clark); Joe Boggs (Hamilton); Jim Chatfield (Horticulture and Crop Science and Plant Pathology); Erik Draper (Geauga); Dave Dyke (Hamilton); Gary Gao (Delaware); Becky McCann (Agricultural Business Enhancement Center (ABE)); Dave Shetlar (Entomology); Amy Stone (Lucas); Nancy Taylor (Entomology/C. Wayne Ellett Plant and Pest Diagnostic Clinic (CWEPPDC)); and Curtis Young (Hancock).

In This Issue:

  1. WEATHERWATCH.
  2. HORT SHORTS: Growing Degree Days (GDD); Vegetable Gardening 101 - June 25, 2009 - Sweet Corn Tips; Bark Splitting - What Can Be Done?; Who You Gon'na Call? (Possible Poisonings); and Plants of the Week: Annual (Calibrachoa), Perennial (Geranium or Cranesbill), Woody Ornamental (Japanese Maple), and Weed (Common Chicory).
  3. GREEN SHORTS: Contour Infiltration Planting News Release.
  4. CLINIC CLIPS.
  5. BUGBYTES: Japanese Beetle Adults Emerge; Mimosa Webworm; Fall Webworm Nest Expansion; The Case of the Disappearing Catalpa Cats (Paper Wasps); and EAB Update.
  6. DISEASE DIGEST: Report from Crablandia (Early Disease Ratings).
  7. TURF TIPS: Dog-Day Cicadas Emerge, Cicada Killers Soon to Follow; Buckeye Turf and Brown Patch Disease; and A Cut Above (Blade Sharpening).
  8. INDUSTRY INSIGHTS: White Pine Weevils a Top Problem; Hail and Hardy Diagnostic Challenge; Members of OSU Extension Toured Scotts in Marysville; and Plant Industry Building Dedicated.
  9. COMING ATTRACTIONS: The OSU Chadwick Arboretum Open House; Greater Cincinnati Branch of the Professional Grounds Management Society Annual Regional Meeting and Site Visitation; Northwest Ohio Green Industry Summer Session; Pesticide Applicator Training Offered; Wood Destroying Insect Inspection Training; and Dates Set for Commercial Applicator Recertification Conferences.
  10. BYGLOSOPHY.

 

1. WEATHERWATCH.

The following weather information summarizes data collected at various Ohio Agricultural Research Development Center (OARDC) Weather Stations spanning the dates: June 1-24, 2009, with the exception of the soil temperatures which are readings from Wednesday, June 24, 2009 at 6:05 p.m.

In the last several weeks, many of the stations had been recording lower than normal precipitation totals. Recent rains have at least increased actual monthly totals, and in the case of Wooster, Hoytville, and Piketon, precipitation totals are higher than the respective averages. Summer officially arrive on Sunday, June 21 with summer-like temperatures arriving simultaneously with much of the state experiencing highs in the 90s on Wednesday.

Weather
Station
Region of
Ohio
Ave. High
Temp F
Ave. Low
Temp F
Total
Precip."
Normal
Precip."
Soil Temp F
2"/3"
Ashtabula
NE
72.1
52.4
3.073.70
85.28/83.58
Wooster
NE
77.4
54.73.33
3.10
82.07/79.65
HoytvilleNW81.4
58.8
3.15
2.80
98.07/93.04
ColumbusCentral
81.7
59.4
1.77
3.50
86.59/82.47
Piketon
South
81.4
59.7
2.742.30
86.61/83.54

 

For a link to the OARDC Weather Stations, visit: http://www.oardc.ohio-state.edu/centernet/weather.htm

 

2. HORT SHORTS.

 

A. GROWING DEGREE DAYS (GDD)

GDD is a measure of the daily maximum and minimum temperature and directly relates to growth and development of plants and insects. The GDD of any zip code location in Ohio is estimated using the GDD of ten OARDC weather stations and available on the web at the site http://www.oardc.ohio-state.edu/gdd/ .

The range of GDD accumulations in Ohio from north to south is 795 to 1,348. Following is a report of GDD for several locations around Ohio as of June 24, 2009: Painesville, 795; Cleveland, 867; Toledo, 1,070; Canfield, 916; Findlay, 1,118; Wooster, 994; Coshocton, 1,119; Columbus, 1,250; Springfield, 1,246; Dayton, 1,250; Cincinnati, 1,298; Ironton, 1,301; Portsmouth, 1,305; and Piketon, 1,348.

To put these GDD accumulations into perspective, the following is an abbreviated listing of plant and insect species with their respective phenological event and average GDD accumulations at which these events occur. Due to variations in weather, temperature, humidity, etc., these events may occur a few days earlier or later than predicted by the average GDD. By looking at a city, town or village near you from the above list or visiting the above web site, you can see what could be taking place in the landscape around you.

Greater peach tree borer, adult emergence, 775; rhododendron borer, adult emergence, 815; northern catalpa, full bloom, 816; mountain laurel, full bloom, 822; dogwood borer, adult emergence, 830; oakleaf hydrangea, first bloom, 835; cottony maple scale, egg hatch, 851; panicle hydrangea, first bloom, 856; fall webworm, egg hatch (first generation), 867; mimosa webworm, egg hatch (first generation), 874; fuzzy deutzia, full bloom, 884; winged euonymus scale, egg hatch, 892; spruce budscale, egg hatch, 894; winterberry holly, full bloom, 897; panicled goldenraintree, first bloom, 924; June bride littleleaf linden, first bloom, 953; azalea bark scale, egg hatch, 957; Japanese beetle, adult emergence, 970; rosebay rhododendron, first bloom, 1,010; June bride littleleaf linden, full bloom, and 1,115; bottlebrush buckeye, first bloom, 1,158; Ural falsespirea, first bloom, 1,170; panicled goldenraintree, full bloom, 1,251; rose-of-sharon, first bloom, 1,347; and pine needle scale, egg hatch - 2nd generation, 1,349.

For more information, see:

Search PlantFacts.osu.edu

 

B. VEGETABLE GARDENING 101 - JUNE 25, 2009 - SWEET CORN TIPS. Dave Dyke recently had the pleasure of working with some community gardeners to critique their efforts. Common sweet corn production mistakes included planting too closely in rows and between rows, inter-planting inappropriate crops, planting one long row rather than at least 3 short ones, planting an entire plot at one time, and lack of awareness of the impact of different corn varieties on pollination. Sweet corn should be planted in rows 30-36" apart with 8-12" between plants. Seeds should be planted about 4" apart and then thinned to the desired density after germination. Incorrect spacing will provide less than optimum growing conditions and make cultivation very difficult. Planting crops such as squash or melons along with the corn is often recommended; however, that can also often make cultivation and weed control very difficult and should be done with great care. Sweet corn is wind pollinated. Insufficient pollination will result in poor kernel set on ears. Corn should be planted in block of a minimum of 3 rows. It is better to plant 3 short rows than 1 long one.

While there are numerous sweet corn varieties, there are three main types of sweet corn: standard (su); sugar-enhanced (se); and shrunken-2 (sh2). These types vary in sweetness, keeping quality after harvest, and cold soil vigor. Since different types of corn can cross-pollinate and contaminate one another, they should be isolated from one another. All sweet corn types should be isolated from field corn, popcorn, and ornamental corn. Shrunken-2 varieties must also be isolated from sugar-enhanced and standard sweet corn varieties. Cross-pollination between the sh2 and se or su varieties will destroy the quality of both. Another isolation method is to stagger planting dates or to select varieties that mature at different times. A minimum of 14 days should separate the tasseling time of the different types. It is not essential to isolate sugar-enhanced varieties from standard sweet corn. Finally, sweet corn should be enjoyed throughout the growing season! For a continuous supply of sweet corn, plant early, mid- season, and late varieties or plant every 2 or 3 weeks. Sweet corn planting may begin in early May and the last practical date for planting early varieties is around July 1, depending on location and weather conditions.

For more information, see:


C. BARK SPLITTING - WHAT CAN BE DONE? Gary Gao reported receiving several phone calls about bark splitting in maples trees. BYGLers had a lively discussion about this challenging situation. Some of the common causes for bark splitting in maple are frost cracks, the bending of the tree trunk by strong wind and heavy snow, insects, lightening, mechanical injuries or rapid growth that exceeds the elasticity of the existing bark.

What should concerned homeowners do to help the tree? This is what is recommended by Cornell Extension Service: "Tracing the bark around the split can be very helpful in aiding wound healing. With a sharp knife, starting from one end of the split, trace around one side of the wound, about 1/2-1" back from the split bark. Stop at the other end and do the same procedure on the opposite side of the split. Knives should be sterilized between cuts by dipping them for several minutes in a 1:10 bleach:water solution or a 70% alcohol solution to avoid contaminating the cuts. Carefully remove the bark from inside the traced area." Follow this link for the complete fact sheet: http://plantclinic.cornell.edu/FactSheets/barksplitting/barksplit.htm .

This procedure may not always work. The degree of success depends on the vigor of the tree, width of the spit, and length of the exposure. Sometimes, trees can do some amazing things. Humans can help some.

For more information, see:

D. WHO YOU GON'NA CALL? The last several weeks BYGLers have been answering questions from itchy callers who have spent time outside and have developed rashes. It is important for one to understand the risk of exposure to poisonous plants, how to prevent exposures and protect yourselves, and what you should do if you come in contact with these plants.

Plants generally poison by: ingestion, when a person eats a part of a poisonous plant; contact, when a person makes contact with a poisonous plant that causes any type of skin irritation or dermatitis; or absorption or inhalation, when a person either absorbs the poison through the skin or inhales it into the respiratory system. Plant poisoning can range from minor irritation to death. For extensive lists of toxic and safe plants, see http://www.plantsciences.usdavis.edu/ce/king/PoisPlant/ or http://www.ansci.cornell.edu/plants/ .

The United States National Poison Hotline is 1-800-222-1222. When you call this number you will be automatically linked to the nearest poison center in the United States. Call this number 24 hours a day, 7 days a week to talk to a poison expert.

There is also an Animal Poison Control Center for any animal poison-related emergency, 24 hours a day, 365 days a year. If you think that your pet may have ingested a potentially poisonous substance, call (888) 426-4435. A $60 consultation fee may be applied to your credit card. For more information see http://www.aspca.org/pet-care/poison-control/plants/ .

If you think someone's been poisoned treat by the exposure. Mouth: Remove any remaining parts of the plant or mushroom from victim's mouth and clean out the mouth. Give a small amount of water. Skin: Wash any skin exposed to the plant with soap and cool water as soon as possible. Eyes: Flush eyes with lukewarm water for 10-15 minutes. Be very gentle, as vigorous or prolonged rinsing can hurt the eyes. If vomiting is recommended by the Poison Control Center or your doctor, use only Syrup of Ipecac. Do not use anything else, and do not put your finger in the throat to cause gagging, which can cause more injury. If advised to take the person to the hospital, bring the plant or a piece of it along with the label. Follow the first aid instructions if you can. Then call your poison center, 911 or your local emergency number right away.

 

E. PLANTS OF THE WEEK.

Read all about perennials and landscape trees and shrubs in the ONLA publications "Perennial Plants for Ohio" and "Landscape Plants for Ohio." The descriptions and photographs of plants were provided for these publications by the OSU ENLT Team along with other industry plant lovers. These full-color publications are available at http://Buckeyegardening.com for $5.00. Click on "garden store" and then "ONLA plant guides." ONLA members can purchase these in quantities at a reduced price at http://onla.org .

*ANNUAL - CALIBRACHOA (Calibrachoa xhybrida). Sometimes called million bells or trailing petunia, Calibrachoa is related to the petunia and has smaller blooms that resemble petunia blooms. It's an excellent annual for sun and does quite well in containers and hanging baskets. It does not tolerate high pH soils that are found in most of Ohio; therefore, it won't perform as well in the ground. The compact mounding plants grow to around 9" tall on trailing stems; some cultivars grow up to 24" in width. Flower colors are quite vivid and are various shades of violet, blue, red, pink, magenta, yellow, orange, bronze, and white.

For more information, see:

 

*PERENNIAL - GERANIUM or CRANESBILL (Geranium spp.) There are many species and cultivars in the hardy geranium group; they vary in flower color and size, leaf shape and texture, and plant size. The groundcover species are excellent fillers for the garden while the mound forms really show off when in full bloom. Many of the species and cultivars begin blooming in June and go well into the summer. When they finish blooming, shear the flowers and the plants still look great for the remainder of the season. Some produce a second, though smaller, flush of blooms. Flowers range from light pinks to violets to deep blues. Plants sometimes tend to fade in the heat of the summer; cut them to the ground and a new flush of growth and flowers appear. They should be planted in full sun or partial shade for best flowering.

 

*WOODY - JAPANESE MAPLE (Acer palmatum). Location! Location! Location! If this small tree likes its location, it provides the landscape with an elegant touch. However, put it in the wrong spot and it won't be happy and neither will the owner! Japanese maples prefer partial shade and moist, well-drained soil. When in the full sun, they tend to suffer with quite a bit of leaf scorch. The rounded tree has graceful, layered horizontal branches and outstanding foliage, depending upon the cultivar. The purple, cut-leaf cultivars make a nice delicate accent to a shrub or perennial border. They grow to around 20' tall but there are smaller cultivars available as well.

For more information, see:

Cultivars of Japanese Maple
Japanese maple cultivar descriptions

 


* THE WEEKLY WEED - COMMON CHICORY (Cichorium intybus
). Chicory is actually a bushy perennial herb with attractive blue, lavender, or white, 1" daisy-like flowers. It is commonly cultivated as a coffee substitute and cultivated forms are used as a bitter salad greens.

Although considered a respectable herb by some, common chicory is an extremely common roadside weed, most easily recognizable because of its big blue flowers, and is also found in pastures, hayfields, and turfgrass. This weed is often confused with dandelion when in the rosette stage but quickly becomes erect and branching. Chicory grows on any type of soil, reaching over 4' tall. It blooms prolifically from May to October and reproduces by seeds and from roots.

Search PlantFacts.osu.edu

 



 

3. GREEN SHORTS.

A. CONTOUR INFILTRATION PLANTING NEWS RELEASE. Candace Pollock, Media Relations Coordinator/Technical Editor, Communications and Technology, The Ohio State University recently wrote and distributed a press release on the rather unique green storm water management efforts and collaborations that are taking place in the Cincinnati area by OSU Extension and other institutions in a effort to mitigate the estimated 14 billion gallon of sewage that annually is discharged into its rivers. For the full text of that release please go to: http://www.ag.ohio-state.edu/~news/story.php?id=5212 .

 

4. CLINIC CLIPS.

The C. Wayne Ellett Plant and Pest Diagnostic Clinic (CWEPPDC) has entered its peak season. Samples examined and diagnosed in the past week include: black vine weevil feeding injury on yew; arborvitae leafminer and arborvitae spider mite injury on arborvitae; Dothistroma needle blight on Austrian pine; aphids whose feeding damage was contributing to leaf scorch on European beech; Arabis mosaic virus on hosta; Botryosphaeria canker on juniper; fire blight on fruiting pear; pearleaf blister mite injury on ornamental pear; and bacterial canker on tomato. A wave petunia sample was exhibiting chlorosis due to iron deficiency when the plants were installed into high pH soil.

Despite many meetings this week, Barb Bloetscher has still had time to identify some globular springtails that were caught crawling out of a drain. The resident had cleaned the drain several times with cleaners to no avail. It was suggested that the resident in the apartment below her check for springtails to help determine where in the drain line the springtails are residing. Spruce spider mite damage was diagnosed on a juniper and several calls were received requesting control of Japanese beetles and bagworms.

 

5. BUGBYTES.

A. JAPANESE BEETLE ADULTS EMERGE.

BYGLers in central and southern Ohio reported that Japanese beetle (Popillia japonica) adults are beginning to emerge. The game is afoot! Dave Shetlar noted that these early-birds represent the tip of the iceberg with numbers gradually climbing as the season progresses. Indeed, Dave indicated that based on data from his "grub digs" earlier this season, localized beetle populations could be heavy this year.

Landscape managers should consider a few points as they develop plans to respond to the annual appearance of Japanese beetles. First, the beetles are on the wing for a relatively short period of time with peak populations typically occurring in July in Ohio. Most woody plants such as roses have time to recover from the damage. While the beetle's leaf skeletonizing damage may affect the aesthetics of favored hosts such as lindens, the damage is unlikely to cause serious long-term harm to the overall health of the tree. Thus, a valid management plan for Japanese beetles is to do nothing.

Second, where it is possible to do so, physically removing and destroying the beetles will help to reduce seasonal plant damage. When Japanese beetles find a suitable host plant, they emit a chemical attractant to let other beetles know about the good eats. Removing the "scout" beetles early on will help to reduce the eventual arrival of hungry hoards. Dropping the beetles into a bucket of soapy water will do the trick.

Third, if an insecticide application is deemed necessary, using the naturally occurring insecticide azadirachtin (e.g. Azatin, Neem-a-Way) will help to preserve beneficial insects. Japanese beetles are also susceptible to a wide range of traditional insecticides including pyrethroids and carbamates. As with all pesticides, read and follow label directions and make certain the target plant is not listed as sensitive to damage from the pesticide.

Finally, Japanese beetle traps will not protect landscape plants. In fact, research at the University of Kentucky has shown that instead of protecting plants, the traps can actually enhance plant damage by attracting far more beetles to the landscape than would otherwise appear naturally. While Japanese beetle traps may be a satisfying method to apply a bug coup de grace, their true impact on a beetle management program may fall under the heading of unintended consequences.

For more information, see:

Search PlantFacts.osu.edu

 

B. MIMOSA WEBWORMS.

Joe Boggs reported spotting newly developing nests of first generation mimosa webworms (Homadaula anisocentra) on honeylocusts in southwest Ohio. Despite their common name, mimosa webworms are most often found on honeylocusts in Ohio. The caterpillars feed gregariously as skeletonizers within webs spun over the foliage. Attention is usually drawn to an infestation by clusters of orangish-brown "torched" leaves and leaflets that are tightly encased in webbing.

There are two to three overlapping generations per season in Ohio and female moths often lay eggs on nests from which they developed. Consequently, the nests are expanded by each new crop of caterpillars. Eventually, the nests become so dense that insecticides will fail to penetrate to kill the caterpillars. This means that effective management strategies should focus on targeting the current first generation caterpillars.

Mimosa webworms on honeylocust are generally considered an aesthetic and nuisance pest problem. The nests make trees unsightly and caterpillars will occasionally drop from infested trees to visit backyard gardeners and grillers. There is seldom enough leaf damage in a single season to cause long-term weakening of trees; however, defoliation over multiple successive seasons could present a challenge to tree health.

Standard insecticides labeled for use on honeylocusts are effective in controlling mimosa webworms. However, the numerous predators and parasitoids that naturally deplete the caterpillars can be preserved by using products based on the naturally occurring bacterium Bacillus thuringiensis (Bt). Two applications of Bt products spaced 7-10 days apart and targeting the first generation caterpillars is recommended. Preventing first generation nests will reduce the attraction of trees to second and third generation females.

For more information, see:

Search PlantFacts.osu.edu

 

C. FALL WEBWORM NEST EXPANSION.

Joe Boggs also reported that a number of first generation fall webworm (Hyphantria cunea) nests have reached truly spectacular sizes in southwest Ohio. Normally, first generation nests are seldom as numerous or as large in size as those produced by the second generation. In fact, first generation nests often involve only a few leaves. As with mimosa webworms, female fall webworm moths often lay eggs on or near the nests from which they developed. The nests of the second generation caterpillars usually reach their maximum size in the fall, thus the common name.

Fall webworms only feed on leaves that are enveloped by their silk nest. As caterpillars grow in size, they expand their nest by casting silk over more leaves to accommodate their expanding appetites. Although the webworms will feed on almost any shade, ornamental, and fruit tree, except conifers, the first generation seldom produces appreciable defoliation. However, it is recommended that the current nests be destroyed to prevent the appearance of the much more obvious and damaging second generation.

If nests are few in number and easily accessible, the best control approach is to physically remove and destroy the nests and caterpillars. Insecticide applications should be used sparingly since insecticides may limit the impact of bio‑allies. There are over 50 species of parasitoids, and 36 species of predators known to make a living off of fall webworm. In past seasons, parasitoids have proven to be very effective in reducing year‑to‑year populations of this defoliator.

For more information, see:

Search PlantFacts.osu.edu

 

D. THE CASE OF THE DISAPPEARING CATALPA CATS.


Dave Shetlar sadly reported that the population of CATALPA SPHINX MOTH CATERPILLARS (Ceratomia catalpae) that he has been monitoring is no more. The caterpillars reached the third instar stage and were then all whisked away on the wings of paper wasps (Polistes spp.). As Dave noted, "the caterpillars became pulp to be fed to wasp larvae." Wasps, yellowjackets (Vespula spp.), and baldfaced hornets (Dolichovespula maculate) may buzz around sugary or fermented drinks in the fall; however, during the summer they focus their attention on providing protein in the form of harvested caterpillars, sawfly larvae, etc., to their young. Thus, they are considered beneficial insects.

Catalpa sphinx moth caterpillars are also called catalpa hornworms owing to a distinctive black "horn" on their posterior end. The caterpillars have two "color forms;" a dark form and pale form. Dark form caterpillars have a broad, black stripe running down their backs, and their sides are yellow to yellowish-white with black spots. Pale form caterpillars are light green or greenish‑yellow and may have a row of black spots down the back rather than a black stripe. The caterpillars have two generations per year in Ohio. They spend the winter as pupae 2-3" inches beneath the soil surface.


The caterpillars feed exclusively on their namesake host and high populations can produce noticeable defoliation. However, as Dave's report indicates, between egg hatch and pupation, the caterpillars must run a gauntlet of beneficial insects. The parasitoid wasp Contesia congregata (Family: Braconidae) is a well known nemesis of catalpa hornworms. This is a "gregarious parasitoid" meaning that multiple wasps develop inside a single caterpillar. Heavy parasitism by this wasp typically exerts significant suppressive pressure on catalpa hornworm populations. Indeed, this wasp is considered a major factor in producing dramatic year-to-year fluctuations in catalpa hornworm populations. Hornworm caterpillars festooned with the white, oblong, silken cocoons of this parasitoid wasp are a common site in Ohio.

For more information, see:

Search PlantFacts.osu.edu


E. EAB UPDATE. On June 18, 2009, 's EMERALD ASH BORER quarantine was expanded by the Ohio Department of Agriculture (ODA) to include Clark County. The quarantine, which is in place to slow the spread of the ash tree-killing insect, prohibits the movement of all hardwood firewood and ash tree materials.

Confirmation was received from USDA officials after a sample was submitted to the Ohio State University Extension office in Clark County. The infested tree is located near the intersection of Innisfallen Avenue and Montgomery Avenue in Springfield. This is Clark County’s first known EAB infestation, and quarantines the entire county.

Since EAB was first discovered in Ohio in 2003, ODA has placed 45 of the 88 counties under quarantine. The quarantine makes it illegal to transport ash trees, parts of ash trees, and all hardwood firewood from any quarantined county into a non-quarantined county without a compliance agreement from the ODA. For the latest quarantine map, visit the department's Web site at: http://www.agri.ohio.gov .

Firewood dealers, landscapers, arborists, or woodlot owners interested in transporting ash trees, portions of ash trees, or firewood from quarantined areas can do so only with a department-approved compliance agreement. These agreements stipulate handling practices that mitigate the artificial spread of EAB.

Additionally, there has been an infestation discovered and confirmed in New York, and the quarantine area in Kentucky has recently been expanded to include 20 counties.

For more information, see:

 

6. DISEASE DIGEST.

A. REPORT FROM CRABLANDIA. The OSU crabapple team of Erik Draper, Jim Chatfield and Bruce Cubberley made their first disease ratings this Monday at the Crablandia plots at Secrest Arboretum at the OARDC in Wooster. Their first declaration: unfortunately, it is a very good year for apple scab. Fireblight is about average, some taxa with many strikes, but some of the usual suspects not quite as bad as some years, possibly due to their not having many blossom infections due to their sparse overall bloom this spring. Fireblight incidence in the plot was greatest on 'Foxfire', 'Sinai Fire', and 'Golden Raindrops'. Frogeye leaf spot is about average, showing up heavily on 'Coralburst', 'Professor Sprenger', 'Red Splendor' and 'Dolgo'.

As to scab: of the 79 taxa in the randomized replicated Crablandia II plot, 18 taxa had no incidence of scab. These were 'Adirondack', Malus baccata 'Jackii', 'Calloway', 'Canterbury', 'Dolgo', 'Firebird', 'Foxfire', 'Holiday Gold', 'King Arthur', 'Lollipop', 'Louisa', 'May's Delight', 'Prairie Maid', 'Pumpkin Pie', 'Rawhide', Malus sargentii, 'Silver Moon', 'Spring Sensation', 'Strawberry Parfait', and M. sargentii 'Tina'. Crabapples averaging ratings of 3 or higher already (significant yellowing or defoliation) were 12 and included 'Adams', 'American Masterpiece', 'American Salute', 'American Spirit', 'Canary', 'Harvest Gold', 'Indian Magic', 'Pink Satin', 'Red Splendor', 'Snowdrift', 'Spring Snow' and 'Thunderchild'. We continue to see a bit more scab on 'Prairifire' each year, though ratings still are below the significant aesthetic impact that would be noticed by consumers.

 

7. TURF TIPS.

A. DOG-DAY CICADAS EMERGE, CICADA KILLERS SOON TO FOLLOW.


BYGLers reported that the buzzing of ANNUAL DOG-DAY CICADAS (Tibicen spp.) is now being heard in central and southern Ohio. This means that cicada killer wasps (Sphecius speciosus) will soon be making low-level flights over poorly managed lawns, golf course sand traps, and sand volleyball courts.

Annual dog-day cicadas develop underground just like their periodical 17-year cousins (Magicicada spp.). Although it takes 2-3 years for them to complete their development, some adults emerge every year due to overlapping generations. The emergence occurs during the "dog-days" of summer, thus the common name. The cicada males sing to attract females, just like periodical cicadas; however, dog-day cicadas never emerge in apocalyptic numbers. Their songs are heard as a mild, sporadic buzzing in landscapes and woodlots.

An abrupt halt in the buzzing of a cicada, often punctuated by a high-pitched screech, usually means a cicada killer wasp has committed an insecticidal act. It is no accident that the arrival of the wasps coincides with the arrival of the cicadas. The wasps range in size from 1 1/8-1 5/8" long. Their black bodies are marked with yellow to white patches on the first three abdominal segments. The head, thorax and legs are rusty red and the wings russet-yellow. As with all hymenoptera (wasps, bees, etc.), only the females possess stingers (ovipositors); however, they are not aggressive.

The females spend their time digging and provisioning burrows with paralyzed cicada-prey. The males spend their time establishing and defending territories that encompass the females. The males will aggressively buzz any transgressor who dares to enter their territory … including people. Of course, it's all a ruse since the males lack stingers.

The females prefer to dig their brood burrows in sandy, bare, well-drained soil that is exposed to full sunlight. Although the wasps are considered solitary, they all practice the same nesting behavior. Thus, it is not unusual for there to be numerous burrows, and wasps, in relatively small sandy patches. Cultural practices that promote a thick growth of turf usually eliminate a cicada killer infestation in one or two seasons. Since these are beneficial insects, chemical control should be reserved for severe infestations located in close proximity to human activity. Following label directions, a dusting with carbaryl (e.g. Sevin), or a powdered formulation of a pyrethroid, around the burrows is normally effective in killing the wasps.

For more information, see:

Search PlantFacts.osu.edu

B. BUCKEYE TURF AND BROWN PATCH DISEASE. Recently, the Buckeye Turf website has been updated to include information on brown patch disease posted by Joe Rimelspach from the OSU, Department of Plant Pathology. Description of the fungus and awesome photos are a must see. Check out the website at http://buckeyeturf.osu.edu . This is a great site to have bookmarked for the latest turf news. Don't forget to check back often.

For more information, see:

 

C. A CUT ABOVE. While dull mower blades can cause leaf injury and looks unsightly, it can also cause greater water loss in the lawn too. A clean cut lawn generally looks better, the grass recovers more quickly from mowing, there is a decrease in water loss, and an increase of photosynthesis activity occurring. It is recommended that homeowners typically sharpen their mower blades twice a year or when needed. A quick glance at the turf following a mowing can give an indication if the blades need to be attended to. Signs of dull blades include white fibrous tissue sticking out from the top of the leaf blade.

 

8. INDUSTRY INSIGHTS.

A. WHITE PINE WEEVILS A TOP PROBLEM.


BYGLers throughout Ohio reported that damage caused by white pine weevil (Pissodes strobi) larvae to the main leaders of conifers in landscapes, nurseries, and Christmas tree plantations is becoming very evident. As tops of infested conifers turn reddish-brown, weevil infestations become easy to spot.
In the spring, overwintered females deposit eggs in the terminals of a wide range of conifers including: Douglas-fir; all spruces; and eastern white, Scotch, jack, red, and pitch pine. The resulting white, legless, slightly curved, grub-like larvae tunnel downward just beneath the bark, feeding on phloem tissue until pupation. The tops of weevil infested trees become wilted, turn brown, and die. Main leaders are often curved into a "shepherd's crook." Removing the paper-thin bark from infested leaders will reveal reddish-brown frass (insect excrement) and weevil larvae.

It is too late to apply insecticides to kill the developing larvae. However, it is not too late to reduce populations by removing infested terminals. Wilted terminals should be pruned from trees and the cut ends closely examined to determine if the entire infestation has been removed. Infested material must be destroyed since the weevils will complete their development in cut tops left on the ground. Larval development is typically completed by mid-to-late summer. There is only one generation per year.

For more information, see:

Search PlantFacts.osu.edu


B. HAIL AND HARDY DIAGNOSTIC CHALLENGE.


Diagnosing plant symptoms associated with environmental calamities such as high winds, flooding, drought, heavy snows, and ice storms may present a serious challenge because symptoms often appear long after the event. For example, BYGLers discussed the possibility that bark cracking and branch dieback symptoms currently being seen on some maples may be associated with the hurricane force winds experienced over much of Ohio last September. Parts of Ohio also experienced ice loading on trees this past winter. Both of these weather related episodes must be considered within the mix of all diagnostic possibilities.

Hail damage may present a different diagnostic challenge based on geographical distribution. Hail events are often highly localized with serious damage occurring within a few miles of locations with no hail damage. Plant diagnosticians may be totally unaware of the hail event unless they had first-hand experience with the hail storm, or they are told of the storm.

Joe Boggs reported visiting with a nursery grower this past weekend in southwest Ohio who pointed out hail damage on containerized Canaan fir (Abies balsamea var. phanerolepis). The symptoms appeared as random dieback of the new growth with the affected tips becoming off-colored and eventually turning brown. The damaged new growth drooped but remained attached to the trees. The symptoms mimicked a number of possible plant maladies including some form of tip blight or twig canker. Only a very close inspection revealed the miniscule points of impact where the hail stones caused vascular damage. Symptoms were not obvious on other tree species. Apparently the Canaans were at just the right growth stage to be highly susceptible to the hail damage.

Joe noted that had he not learned from the grower that the new growth had been subjected to a hail event around one week prior to his visit, he would have had a serious challenge with diagnosing the damage. His report is a reminder that with plant problem diagnostics, communication is just as important as observation.


For more information, see:

 

Search PlantFacts.osu.edu



C. MEMBERS OF OSU EXTENSION TOURED SCOTTS IN MARYSVILLE. Ten members of the OSU Extension Nursery, Landscape, and Turf Team (ENLTT) visited The Scotts MiracleGro Company in Marysville, OH on June 19. These team members got to see the research plots on soil amendment, turfgrass fertility, and modular turf growing program. They also saw the raised beds loaded with beautiful vegetables. These vegetable gardens are a part of the one million pound produce challenge where Scotts associates grow vegetables to help feed the hunger. Log on the web at: http://scotts.mediaroom.com/index.php?s=43&item=84 for more information. It was a great experience for the ENLTT members to see the very high productivity of the vegetables and herbs in those raised beds. All of the cool season vegetables were ready for harvest. Warm season vegetables are progressing very well with some of the summer squash almost ready for harvest. The ENLTT members were also very impressed by the creative names for each garden plot and all of the garden structures.

The second part of the tour took the ENLTT members to the Scott's customer call center. The ENLTT members were impressed by the shear volume of the phone calls. The call Center handled between 800,000 to 1,000,000 customer contacts a year! The ENLTT members were able to listen to some of the conversations. It was an excellent learning experience for all! The ENLTT members would like to thank Nancy Reynolds, a manager at Scotts and an Ohio Master Gardener from Delaware County, for arranging this wonderful tour, Mr. Tom Mendenhall, Ms. Claire Nelson, Mr. Jordan Hoewischer, Dr. Phil Dwyer, Mr. John Koenig and Ms. Janis Steed for being great hosts to the ENLTT members!

For more information, see:


D. PLANT INDUSTRY BUILDING DEDICATED. On June 24, 2009, the Ohio Department of Agriculture (ODA) dedicated the department's new Plant Laboratory. During the ceremony held on Wednesday, Director Boggs announced a special partnership with The Ohio State University College of Food, Agricultural, and Environmental Sciences. The lab, located on the Reynoldsburg Campus, will house plant pathology and entomology labs, which provide the resources to quickly identify and take action against dangerous plant pathogens, diseases, and invasive species. Quick reaction time will better protect Ohio’s agricultural resources and prevent plant diseases and pests from damaging the state’s crops, natural resources, and nursery stock.

The lab is a $10.1 million investment in Ohio's future, made possible by the state's Capital Improvement funds. The ODA is also home to the state's Consumer Analytical Laboratory and Animal Disease Diagnostic Laboratory. These labs are considered to be among the finest in the country and were selected to be a part of the Federal Emergency Response Network.

For more information, see:

 

9. COMING ATTRACTIONS.

A. THE OSU CHADWICK ARBORETUM OPEN HOUSE takes place Sunday, July 19, 2009 from 2:00-5:00 p.m. Enjoy root beer floats, music and garden tours - this is a free event! Location: Howlett Hall, 2001 Fyffe Ct., Columbus, OH 43210

B. GREATER CINCINNATI BRANCH OF THE PROFESSIONAL GROUNDS MANAGEMENT SOCIETY (PGMS) ANNUAL REGIONAL MEETING AND SITE VISITATION is scheduled for July 23 and 24, 2009 in Cincinnati, Ohio. Program information, schedules, and registration forms are available on the PGMS website at: http://www.pgms.org .

C. NORTHWEST OHIO GREEN INDUSTRY SUMMER SESSION. Remember to SAVE the date for the 12th annual Northwest Ohio Green Industry Summer Session on August 5, 2009. The event will be held once again at Owens Community College. We are especially pleased of this year's great line up of speakers: OSU Extension; Pam Bennett, Dr. Dave Shetlar, Jim Chatfield, Gary Gao, Joe Rimelspach, and Joanne Kick-Raack; Dr. Roger Funk, The Davey Institute; Stephanie Miller, ODNR; and Matt Ross, Toledo Botanical Garden.

Once again we will have a three hour manager session with Dr. Bernie Erven, OSU Extension, Columbus, Ohio, working with you as you look at Managing for Success. This session will be both informative and very interactive as you look at your business and where you want to grow.

Continuing education credits will be given for ONLA certified technicians, ISA recertification, OLA, and Master Gardener recertification. Contact OSU Extension, ABE Center at 419-354-6916 or http://abe.osu.edu/upcoming-events for more information.

D. PESTICIDE APPLICATOR TRAINING OFFERED. Trained Serviceperson and New Applicator Commercial Schools are planned for August 26, 2009 and September 30, 2009. These sessions will be taught at the Ohio Department of Agriculture (ODA) in Reynoldsburg, Ohio. For additional information on these schools, and other educational opportunities, check out the Pesticide Education website at http://pested.osu.edu .

E. WOOD DESTROYING INSECT INSPECTION TRAINING. Mark your calendars for training on September 16, 2009. This training will be held at ODA in Reynoldsburg. Recertification credit will also be available in Core, 10b and 12. For additional information, check out http://pested.osu.edu .

F. DATES SET FOR COMMERCIAL APPLICATOR RECERTIFICATION CONFERENCES. The following dates have been set for recertification conferences this winter. Mark your calendars now!

  • January 13, 2010, Dayton Convention Center, Dayton
  • February 17, 2010, Kalahari Conference Center, Sandusky
  • March 3, 2010, John S. Knight Center, Akron
  • March 9, 2010, Columbus Convention Center, Columbus

 

10. BYGLOSOPHY.

"The clearest way into the universe is through a forest wilderness." - John Muir

 

 

 

OSU Extension

Where trade names are used, no discrimination is intended and no endorsement by Ohio State University Extension is implied. Although every attempt is made to produce information that is complete, timely, and accurate, the pesticide user bears responsibility of consulting the pesticide label and adhering to those directions.

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