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| Publication Type:
| Report |
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| Author(s): | Held, D.;
Potter, D. A.;
Williamson, C.;
Keathley, C.;
Kunkel, B. |
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| Author Affiliation: | Department of Entomology, S-225 Agric. Sci. Bldg. N., University of Kentucky, Lexington, KY |
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| Title: | Evaluation of Merit for preventative control of june beetle grubs in turf, 1995 |
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| Section: | Ornamentals
Other records with the "Ornamentals" Section
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| Source: | Arthropod Management Tests. Vol. 22, 1997, p. 360. |
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| Publishing Information: | Annapolis, MD: Entomological Society of America |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Low maintenance turfgrass species; Imidacloprid; Preventive control; Insect control; Cotinis nitida; Poa pratensis; Low maintenance; Application rates; Formulations
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| Abstract/Contents: | "This test was conducted in a mature, low-maintenance stand of Kentucky bluegrass and mixed weeds on the University of Kentucky intramural athletic fields, Lexington, KY. The turf was on a Maury silt loam (fine-silty, mixed, mesic Typic Paleudef) with pH = 6.4. There was no thatch. Plots (12 X 12 ft) were arranged in a RCB design with six replications. The turf was treated on 3 Aug, late in the flight of GJB. The site had a history of GJB infestation, and there was very heavy beetle flight for several weeks precedeing the treatment. Conditions at the time of treatment were 86°F, with winds < 10 mph. The liquid applications were given at 50 gpa using a low volume, CO² sprayer equipped with four Spraying System 8004 Tee Jet Nozzles that delivered 2109 g pressure per cm₂. Granular formulations were mixed with dry sand and applied to the plots by gloved hand. Each plot was syringed with about 1/8" water within 5 minutes after application, and the whole site was irrigated with about 3/4" (2 cm) of water as soon as the last treatment had been applied. There was 1.78 inches of rainfall on 5 Aug, and another 0.5 inch over the next 3 days. Plots were sampled on 26 Sep using an insecticide flush method that takes advantage of the fact that GJB grubs die on the turf surface following applications of conventional insecticides. Triumph 4E (isazophos) was applied at the labeled rate (2 lb(AI)/acre) using a Solo backpack sprayer. The flush spray was immediately syringed with 0.25" of water as before. Grub populations were assessed at dawn on the following day. A 2 X 2m frame made from PVC pipe was placed in the center of each plot, and dead GJB grubs within the sample area were counted. Data were analyzed by two-way analysis of variance with means separated by Fisher's protected LSD test. Two of the replicates at one end of the study site had almost no grubs in any plots (including checks). Because of this obvious heterogeneity in the study site, these replicates were excluded from the final analysis. Grub densities in untreated plots of the remaining four replicates were very high, an average of 35 per m₂. All grubs were third instars at the time of sampling. Merit 75WP provided excellent (94-99%) control. Merit 0.5G also provided significant control, but was not effective at the 75 WP formulation. There was no evidence of phytotoxicity from any treatment. The capacity to control GJB grubs with Merit applied during the beetle flight is noteworthy because it resolves a potential environmental hazard that results when convential control measures are used. When GJB are controlled curatively, the large, contaminated grubs die by the thousands on the turf surface, where they are fed upon by birds and other predators. They also pose a nuisance to golfers, homeowners, and other persons. Pre-hatch control with Merit does not result in grubs dying on the surface." |
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| Language: | English |
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| References: | 0 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Held, D., D. A. Potter, C. Williamson, C. Keathley, and B. Kunkel. 1997. Evaluation of Merit for preventative control of june beetle grubs in turf, 1995. Arthropod Manage. Tests. 22:p. 360. |
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