| BYGL - July 9, 2009 |
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This is the 14th 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 July 7th conference call: Pam Bennett (Clark); Barb Bloetscher (Entomology/C. Wayne Ellett Plant and Pest Diagnostic Clinic (CWEPPDC)); Joe Boggs (Hamilton); Cindy Burskey (Clermont); Jim Chatfield (Horticulture and Crop Science and Plant Pathology); Erik Draper (Geauga); Dave Dyke (Hamilton); Gary Gao (Delaware); Dave Goerig (Mahoning); Amy Stone (Lucas); Nancy Taylor (CWEPPDC); Curtis Young (Hancock) and Randy Zondag (Lake). In This Issue:
1. WEATHERWATCH.The following weather information summarizes data collected at various Ohio Agricultural Research Development Center (OARDC) Weather Stations spanning the dates: July 1-July 7, 2009, with the exception of the soil temperatures which are readings from Wednesday, July 8, 2009 at 6:05 a.m. Temperatures continue to be on the cool, but "enjoyable" side for many BYGLers. Many parts of the state remain dry.
For a link to the OARDC Weather Stations, visit: http://www.oardc.ohio-state.edu/centernet/weather.htm
2. HORT SHORTS. A. VEGETABLE GARDENING 101 - JULY 02, 2009 - IS SUCKER REMOVAL IN SWEET CORN HELPFUL? Gary Gao received a phone call from a home gardener who grew about 200 sweet corn plants. The gardener asked whether it would be beneficial to remove suckers from his sweet corn plants. It turns out that there is not much benefit, if any, to remove suckers. Removal of suckers might eliminate some competition. However, research data have not shown any significant increase in sweet corn yield or improvement to quality. Hence, there is no need to remove suckers. Less work, and more time to worry about other things! For more information, see:
B. PLANTS OF THE WEEK.
For more information, see:
3. GREEN SHORTS.A. THE ENVIRONMENTAL BENEFITS OF TURFGRASS. Turf has many attributes that makes it use in the landscape desirable, these include: *Its deep green carpet-like growth enhances other landscape features. However, turf also has some significant environmental benefits that also be considered when selecting plant materials and landscape designs. Here are some facts relating to those benefits: *The 8.5 million grass plants in a healthy 10,000 sq. ft. lawn absorb 6,000 gallons of rainwater.
4. CLINIC CLIPS.Barb Bloetscher, the CWEPPC entomologist identified chewing damage from the pear slug on crabapple and old oviposition scars from a tree cricket. An empty praying mantis egg case was submitted. Also submitted was a branch from a black cherry tree, suspected to have killed a llama. Since only wilted branches are known to sicken llamas, the reason for its untimely death is still unknown.
5. BUGBYTES.A. ORNERY HORNETS.
Ohio enjoys several species of hornets including the smaller GROUND DWELLING YELLOW JACKETS (Paravespula vulgaris and P. maculifrons) and several aerial species of yellow jackets including the GERMAN YELLOW JACKET (Paravespula germanica) which make paper nests in wall voids or tree hollows. Yellow jackets are easily identified by their vivid black and yellow striped bodies, although each species has its own distinct banding pattern. Bald faced and EUROPEAN HORNETS (V. crabro) both build large paper nests, the bald faced hornet's nest typically seen hanging from tree branches. The European hornet's nest is usually enclosed in a void or hole in the ground and made of wood fiber. CICADA KILLERS (Sphecius speciosus) are the largest hornet and the least likely to sting. Instead they are busy scooping up cicadas to drag into their tunnels in the ground. All can be identified by their relatively thick, heavy body (similar to a bee) and colorful striping. All species are beneficial as they are great predators of common garden pests such as cutworms and other soft bodied insects (except for the cicada killer), however at times they chose to build their nests in high traffic areas. If the hornets are in an area where people play, eat or pass where the hornets are flying in and out of their nests, treatment may be required. To date, the best control for nests in the ground or other accessible entrances is carbaryl dust (e.g. Sevin) or the new product, Eight. Make sure that the dust will not blow or land anywhere except into the entrance hole. Wearing gloves and a dust mask, and having an instrument that will funnel the dust into a small hole, blow several puffs of the insecticidal dust into the entrance hole at early dawn. Bees and wasps are rather lethargic and slow moving after a cool night. Leave the area immediately after blowing the insecticide dust into the entrance and avoid the nest until the following day. The activity of the yellow jackets should have declined dramatically. Never dump gasoline into a nest near a structure as concentrated fumes could cause an explosion! For the bald faced hornet's head-sized paper nests, direct an insecticidal wasp spray that shoots a stream into the nest from 50' away. Use the same precautions mentioned above. Because of the tenacious habit of these black and white hornets, contacting a reputable pest control professional is a sage alternative. For more information, see: B. SQUISHED SQUASH.
The moth belongs to the family Sesiidae; the clearwinged moths. Clearwinged moths are so named because many species lack scales on their wings. They mimic wasps both in the membranous appearance of their wings and the shape of their bodies. However, squash vine borer moths only slightly resemble wasps. Their front wings are covered in dark metallic-green scales, and only their hind wings are clear. The moth's thorax is greenish-black, and their abdomen is a flamboyant reddish-orange topped with a dorsal row of black dots. There is typically only one generation of this moth per season in Ohio; however, occasionally a partial second generation may occur in the southern part of the state. Adults fly during the day, and they may be observed from early-June through early-August. Management strategies to minimize the overall impact of this insect include catching and killing moths that are resting on leaves in the afternoon before they lay eggs; hand-picking the dull red eggs from main stems before they hatch; wrapping stems in strips of old nylon to prevent egg laying; excavating larvae from infested stems then burying the stem nodes to produce new plants. Plants may also be protected by covering them with cloth "row covers" that are available at many garden centers. Of course, the covering will also exclude pollinators which means gardeners must hand pollinate the flowers. Standard insecticide applications may also be used, but multiple applications are required and insecticides applied near the flowers will kill bees and other pollinators. For more information, see:
C. SLIMY SLUG SPOTS.
If control is necessary, the first step should be to remove the mulch from under the plants being eaten, so that the slugs have no place to hide. Reduce the irrigation if the soil surface remains moist. Metaldehyde, sold as "Bug Getta" and other trade names, is the standard mulloscicide available. A product is labeled for vegetable gardens as well, copper sulfate which supposedly electrocutes the slimy mullosks. Diatomaceous earth may slow the common garden slug, however the large leopard can slime right over it unharmed. Handpicking and crushing is another option. Slugs become active at dusk, sliding out from under mulch, leaves, and other moist hideouts to chew edges of leaves and make ratty looking holes on the bottom leaves. The best way to determine if slugs are active is to shine a light at an angle on the leaves. A shiny, slightly iridescent coating will be on the leaves where the slug has slimed its way across the leaves. To investigate further, go outside at dusk with a flashlight and examine the leaves in question. You may be able to catch the slugs in the act! Presently, the evening observer may have the opportunity to observe the gray or large leopard slugs partaking in their magical, mysterious mating behavior. Although hermaphroditic and able to produce eggs on their own, apparently the slugs will seek a mate on cool, cloudy summer evenings when dew or moisture is present. This unusual procedure is not for the casual voyeur, as the slugs will crawl several feet up a vertical surface, twist and turn then hang from a slimy bungee cord forming a spiral, and remain hanging for several minutes! After the slugs have formed their love knot, a mucous cord hangs which contains the fertilized eggs. This mass will drop then the slugs will unwind and slide off into the night. For more information, see: 6. DISEASE DIGEST.A. LATE BLIGHT UPDATE - TOMATOES AND POTATOES. Gary Gao and other BYGLers received phone calls or emails about the LATE BLIGHT OF TOMATO. Sally Miller, Department of Plant Pathology, and Nancy Taylor, Plant and Pest Clinic, The Ohio State University, provided an update about this disease in the VegNet 14-09 http://vegnet.osu.edu/ . Here is an excerpt from the update. "Late blight was confirmed in a non-commercial tomato sample in Ohio on June 25. As reported last week in VegNet #12-09, late blight has also been found on tomatoes from home gardens in Pennsylvania and New York, and from commercial farms in Pennsylvania and Virginia. It has also been confirmed on potatoes from Pennsylvania. Infected plants were found at a Lowes in New York, and since Lowes retails plants from a limited number of suppliers, it is possible that infected plants may be now widely distributed across the country. It is also possible that diseased plants may have been/are being distributed by other retailers. Weather conditions (cool-warm with high moisture - rain or heavy dew) in Ohio have been very favorable for late blight. Potato and tomato growers should protect plants with appropriate fungicides as long as favorable environmental conditions persist. Heirloom and conventional tomato varieties alike are susceptible to late blight. Home gardeners need to destroy plants already infected by pulling out the entire plant(s), immediately bag it (them) in a plastic bag, and dispose of the closed (tied or knotted) bag in the garbage. Do not put the plants on a compost pile or in a composter, or leave them lying about. Live plant tissues serve as a source of inoculum, and uprooted plants may support active spores of the pathogen for some time. Healthy-looking plants should be protected with a fungicide containing chlorothalanil or copper; several brands are available in garden centers and other retail outlets. Chlorothalanil is more effective than copper in controlling late blight." Refer to the OSU Extension FactSheet, HYG#3102, "Late Blight of Tomato and Potato" for more information. The factsheet is available online at: http://ohioline.osu.edu/hyg-fact/3000/3102.html For more information, see:
B. DOWNY MILDEW OF CUCURBITS.
If not already started, commercial cucumber growers in northern Ohio counties should begin treatment of cucumber fields with the more effective fungicides against downy mildew such as Presidio, Ranman and Previcur Flex. These products must be used in a program with other effective fungicides and must be alternated to reduce the possibility of fungicide insensitivity developing in the downy mildew pathogen population. Please see the Ohio Vegetable Control Guide (OSU Extension Bulletin 672) and previous Vegnet issues for details. It is also recommended that growers consult the cucurbit downy mildew forecasting website http://www.ces.ncsu.edu/depts/pp/cucurbit/ for information on weather patterns and predicted risk of downy mildew development. An intensive fungicide program is not recommended yet for other vine crops at this time but these crops should be protected with a broad spectrum protectant fungicide such as Bravo or Manzate." OSU Extension professional need to contact Sally Miller of Plant Pathology, OARDC/OSU, or Nancy Taylor of C. Wayne Ellett Plant Pest Diagnostic Clinic, if they suspect that a cucumber sample has downy mildew. A sample should be sent to Sally Miller or Nancy Taylor for a confirmation. Follow this link for their contact information: http://plantpath.osu.edu/faculty-and-staff/ For more information, see:
7. TURF TIPS.A. JAPANESE BEETLES AND GRUBS. For more information, see: OSU FactSheet on Japanese BeetleOSU FactSheet on Management of Turfgrass Pests, Weeds, Diseases and Insects 8. INDUSTRY INSIGHTS.A. AMBROSIA BEETLES.
The tiny 1/8" long beetles produce shot-sized entrance holes in tree bark. As the beetles bore through trees, they release fungi from special oral structures called mycetangia. The fungi colonize the wood, and serves as food for the beetle larvae. The larvae do not eat wood; they eat the fungal "ambrosia." As the beetles tunnel forward into trees, they push a mixture of excrement (frass) and wood particles backwards. The sticky mixture clings together as it is extruded from the entrance holes and has been commonly described as looking like "frass toothpicks." In recent years, this toothpick-like symptom has been almost exclusively associated with non-native ambrosia beetles such as the GRANULATED AMBROSIA BEETLE (Xylosandrus crassiusculus ), which was formerly known as the ASIAN AMBROSIA BEETLE. However, there are a number of native ambrosia beetles that also produce frass toothpicks. These include the YELLOW-BANDED TIMBER BEETLE (Monarthrum fasciatum) that focuses their boring attention on oak, maple, birch, sweetgum, blackgum, and hickory; and the BEECH TIMBER BEETLE (Xyloterinus politus) that targets its namesake as well as oak, maple, birch, hickory, ash, and magnolia. While these beetles target stressed, dying, or dead trees, the bottom line is that frass toothpicks do not always point in the direction of non-native ambrosia beetles. Ambrosia beetle management strategies include addressing tree stress issues such as poor fertilization, irrigation, etc. Heavily infested trees should be removed and destroyed and trees located nearby should be protected with bark applications of insecticides formulated as long-residual borer sprays, such as Onyx (bifenthrin) or Astro (permethrin). Applications must be made to trunks and branches at 4-week intervals throughout the growing season. For more information, see: 9. COMING ATTRACTIONS.A. SOUTHWEST OHIO BYGLIVE! WALK-ABOUT. The fourth monthly Southwest Ohio BYGLive! Diagnostic Walk-About for 2009 will be held Monday, July 13, from 12:00-3:00 p.m. at Glenwood Gardens (Hamilton County Park District), 10623 Springfield Pike, Woodlawn, 45215. This monthly hands-on training for Green Industry professionals focuses on diagnosing plant pest, disease, and physiological problems. ISA Certified Arborist CEU's will be available. Participants will meet in the parking lot furthest from the entrance to the Gardens. For more information, contact Joe Boggs at 513-946-8993. B. SPRAY OPTIMIZATION WORKSHOP. Optimizing spray rates for nurseries can save time, material and money. This workshop will be held on July 15, 2009 at Natorp's Nursery, 5373 Merten Drive, Mason, OH (a.m. sessions) and 8601 Snider Road, Mason, OH (p.m. sessions). To register for the workshop contact OSUE Lake County, phone: 440-350-2582. Make checks payable to: Associated Green Industries. C. 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 D. 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 . E. 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. F. 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 . G. 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 . H. DATES SET FOR COMMERCIAL APPLICATOR RECERTIFICATION CONFERENCES. The following dates have been set for recertification conferences this winter. Mark your calendars now!
10. BYGLOSOPHY.From the BYGLers traveling in Minnesota teaching the Minnesotans about EAB, "Burn it where you buy," especially during peak camping season.
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| Last Updated on Friday, 10 July 2009 15:49 |













