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| Publication Type:
| Report |
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| Author(s): | Vittum, P. J. |
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| Author Affiliation: | Department of Entomolgy, Fernald Hall, University of Massachusetts, Amherst, Massachusetts |
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| Title: | Effect of date of application on efficacy of reduced rates of Dursban against annual bluegrass weevils, golf course fairway, 1993 |
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| Source: | Arthropod Management Tests. Vol. 19, 1994, p. 317. |
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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: Chlorpyrifos; Poa annua; Agrostis stolonifera; Insecticide evaluation; Insect control; Application timing; Application rates
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| Abstract/Contents: | "Chlorpyrifos (Dursban 4E) was applied at reduced rates (1.1 or 2.2 kg (AI)/ha) on two of three dates. Applications were made on 28 apr (Forsythia in full bloom), 10 May (Cornus florida in full bloom), or 24 May using a golf course sprayer (FMC unit, operating at 700 liter/ha, 5.5 m boom width). Plots ran the width of the fairway (ca. 25 m) and were 5.7 m wide. Plots were replicated 4 times in a CRD and were established on a golf course fairway in Scarborough, NY; annual bluegrass (30%), creeping bentgrass (70%), maintained at 1.2 cm. Soil pH was 6.4, water pH used for application was 5.8 on Apr 28, 6.0 on 10 May, and 6.1 on 24 May. Product efficacy was evaluated on 14 Jul by removing 9 soil cores (5.7 cm diam, 4 cm deep) from both ends of each plot, at least 1 meter from the edge. Insect counts were made by combining totals from 3 plugs per recorded observation (6 observations per plot, 24 observations per treatment). At the time of sampling, the population was 1% 3rd instar, 6% 4th instar, 56% 5th instar, and 34% pupae. All four treatment combinations reduced the populations significantly relative to the untreated control. The population pressure in the untreated control was extremely heavy (350 weevils per 0.1 m2), but only one rate/date combination reduced the population below the currently accepted threshold (30 to 50 weevils per 0.1 m2). Large plots, as employed in this trial, may provide a more accurate indication of efficacy of materials, particularly when trials are directed against ovipositing females. It appears that split applications of reduced rates of Dursban may provide adequate control in early season control efforts." |
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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):
Vittum, P. J. 1994. Effect of date of application on efficacy of reduced rates of Dursban against annual bluegrass weevils, golf course fairway, 1993. Arthropod Manage. Tests. 19:p. 317. |
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