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| Publication Type:
| Report |
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| Author(s): | Redmond, C. T.;
Patterson, C. G.;
Potter, D. A. |
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| Author Affiliation: | Dept. of Entomology, University of Kentucky |
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| Title: | Residual Control of Southern Masked Chafer Grubs |
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| Source: | Insecticide and Acaricide Tests. Vol. 15, 1990, p. 322. |
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| Publishing Information: | Lanham, MD: Entomological Society of America |
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| Keywords: | TIC Keywords: Poa pratensis; Cyclocephala lurida; Silty soils; Thatch; Loam soils; Isofenphos
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| Geographic Terms: | Kentucky |
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| Abstract/Contents: | "This study was conducted on a Kentucky bluegrass plot in Fayette County, Ky. The established turf was on a Maury silt loam soil (fine-silty, mixed, mesic Typic Paleudalf) with pH 6.2. Thatch accumulation was < 0.25 inches. Replicated plots (6 X 6 ft) were treated with isazaphos [Isazophos] (Triumph 4 E), trichlorfon (Dylox 80 WP), or isofenphos (Oftanol 2 F) on 23 Jun, 6 Jul, 20 Jul, 3 Aug, or 17 Aug, corresponding to 10, 8, 6, 4, or 2 wk before grubs were implanted into the turf. Rates (AI/acre) were a) Triumph: 2 lb; b) Dylox: 8 lb; and c) Oftanol: 2 lb. Treatments were applied as liquids using a CO2 powered sprayer that delivered 1.3 gal/1000 ft2. All plots were then irrigated with 0.75 inches water. There were 4 replicates/treatment/date, the plots for each date arranged in a randomized complete block design. On 29 Aug, turf/soil cores (6 by 6 inches) were removed from each plot and set inside 6-inch-diam by 7-inch-long sections of plastic pipe; the bottoms of the soil cores were 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 plot. Plots were then irrigated. Third-instar SMC grubs were collected from an untreated golf course rough on 30 Aug. Ten SMC were placed into each cylinder; those that did not burrow into the soil within 10 min were replaced. A "remedial: treatment was applied to one set of plots on 31 Aug after grubs had been implanted to provide comparative data on effectiveness of insecticides applied when grubs were present. On 15 Sep, the cylinders were removed from the plot, the soil cores were broken apart, and the living and dead or obviosly moribund SMC were counted. All treatments provided significant control when applied at the time when SMC were present. No treatment except Oftanol provided significant residual control, even for 2 wk. Oftanol applied 4 or 6 wk before the target date gave residual control of 56% and 78% respectively (the difference between 6 wk and 4 wk is probably due to biological and experimental variation). Oftanol did not give significant residual control for more than 6 wk. Control of SMC is best done after the eggs have hatched (7-14 Aug 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." |
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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):
Redmond, C. T., C. G. Patterson, and D. A. Potter. 1990. Residual Control of Southern Masked Chafer Grubs. Arthropod Manage. Tests. 15:p. 322. |
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