Full TGIF Record # 19264
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Author(s):Redmond, C. T.; Patterson, C. G.; Potter, D. A.
Title:Residual effectiveness of 3 insecticides for control of masked chafer grubs, 1989
Source:Kentucky Turfgrass Research. 1990, p. 41-42.
Publishing Information:Lexington, KY: University of Kentucky, College of Agriculture, Cooperative Extension Service
Series:Progress Report 328
Keywords:TIC Keywords: Poa pratensis; Cyclocephala lurida; Grubs; Insecticides; Root damaging pests; Insect control; Residual effects
Abstract/Contents:"Replicated plots (6x6 ft) were treated with isazaphos [isazophos] (Triumph 4E), trichlorfon (Dylox 80WP), or isofenphos (Oftanol 2F) on June 23, July 6, July 20, August 3, or August 17, corresponding to 10, 8, 6, 4, or 2 weeks before grubs were implanted into the turf. Rates (active ingredient per acre) were a) Triumph: 2 lb; b) Dylox: 8 lb; and c) Oftanol: 2 lb. Treatments were applied as liquids with a Carbon dioxide powered sprayer that delivered 1.3 gallons per 1000 ft2. Check plots were left untreated. All plots were irrigated with about 3/4 inch of water immediately following treatment. There were 4 replicates per treatment per date; the plots for each date arranged in a RCB design. On August 29, turf/soil cores (6" diameter, 6" deep) were removed from each plot and set inside sections of PVC pipe (6" diameter, 7" deep) with the bottom of the soil core even with the bottom of the pipe. A piece of fiberglass window screen was placed over the end of each pipe, and the pipes with cores were replaced in the plots. Plots were then irrigated. Third-instar southern masked chafer grubs were collected from an untreated golf course rough on August 30. Ten grubs were placed into each cylinder; grubs that did not burrow into the soil within 10 minutes were replaced. A "remedial" treatment was applied to one set of plots on August 31 after grubs had been implanted to provide comparative data on effectiveness of insecticides applied when grubs were present. Cyclinders were removed from the soil on September 15. Soil cores were broken apart and the number of living and dead or obviously moribund grubs was counted. All insecticides provided good control of masked chafer grubs when applied at the time when the insects were present. However, none of the treatments except Oftanol provided significant residual control, even for as short a period as 2 weeks. Oftanol applied 4 or 6 weeks before the target date gave residual control of 56% and 78% respectively (the apparently greater control at 6 weeks than at 4 weeks is probably due to biological and experimental variation and is probably not meaningful). Oftanol failed to provide significant residual control for more than 6 weeks. Control of white grubs is best done after the eggs have hatched (August 7-14 in most years) but before damage becomes severe. These data suggest that when treatments must be applied earlier than this target date, only Oftanol can be expected to provide significant residual control of grubs."
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Redmond, C. T., C. G. Patterson, and D. A. Potter. 1990. Residual effectiveness of 3 insecticides for control of masked chafer grubs, 1989. KY. Turfgrass Res. p. 41-42.
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