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| Web URL(s): | https://listings.lib.msu.edu/iowat/1988.pdf#page=79
Last checked: 01/12/2017
Requires: PDF Reader |
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| Publication Type:
| Report |
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| Author(s): | Lewis, D. L.;
Christians, N. E. |
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| Author Affiliation: | Lewis: Associate Professor, Entomology Department; and Christians: Professor, Turfgrass Science, Iowa State University |
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| Title: | Comparative effectiveness of insecticides against annual white grubs - 1987 |
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| Source: | 1988 Iowa Turfgrass Research Report. 1988, p. 74-76. |
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| Publishing Information: | Ames, Iowa: Iowa State University Extension |
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| # of Pages: | 3 |
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| Series: | FG-454 |
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| Keywords: | TIC Keywords: Melolonthinae; Chlorpyrifos; Diazinon; Bendiocarb; Ethoprophos
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| Abstract/Contents: | The objective of this study was to evaluate and compare the efficacy of several registered and experimental insecticides against annual white grubs infecting turfgrass. The study was done on a golf course with soil of Waukegan loam (fine-silty over sandy, mixed, mesic typic hapludoll). The plots were at the crest of an east-facing slope. The grass was Kentucky bluegrass and is low-maintenance and mowed at 3 inches. Grub damage was apparent throughout the plot vicinity at the time of insecticide application. The treatments were applied on August 18, 1987. A second application of Diazinon AG500 and 15G (the 'split' treatments) was applied a week later on August 26. Grub population counts were made September 10, 1987. The experimental design consisted of 13 treatment plots and one untreated plot, randomly assigned in each of three replication. Each plot consisted of 25 square feet. All insecticides were applied at the rate specified on the manufactures label or product guidelines. Annual white grub population counts were made three weeks after treatment by randomly selecting four 6-inch square sample sites in each plot. The count was taken from the sod and 2 inches into the soil. In five years of conducting this test with insecticide, this was our best study. The study site was ideal; it had a large uniform population of white grubs; treatments were applied without difficulty and watering was timely and plentiful. The average population density in the untreated check plots was 27 white grubs per sq ft. This exceeds population density thresholds sufficient to cause damage in irrigated, healthy turfgrass. Dursban 4E and ME formulations had were effective at both 0.5- and 1.0-lb rates, however this is a common complaint within the turfgrass industry. Turcam in the high rate (7.0 lb ai/A) did show some reduction in group populations. Both diazinon formulations (AG500 and 14G) in both regular and "split" treatment produced significant grub reduction. The single application, high rate, diazinon plots had fewer grubs, but the control was not significantly better than in the plots receiving two treatments at the lower rate. The top performing compounds in this study were Diazinon AG500, Mocap 5G and Triumph 4E. |
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| Language: | English |
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| References: | 0 |
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| See Also: | See also article summary "Annual white grub test results" Iowa Turfgrass Grower, 12(2) June 1988, p. 8, R=322393 R=322393 |
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| Note: | "July, 1988"
Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Lewis, D. L., and N. E. Christians. 1988. Comparative effectiveness of insecticides against annual white grubs - 1987. Iowa Turfgrass Res. Rep. p. 74-76. |
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| Web URL(s):
https://listings.lib.msu.edu/iowat/1988.pdf#page=79
Last checked: 01/12/2017
Requires: PDF Reader |
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MSU catalog number: SB 433 .A1 I55 |
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