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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, MA 01003 |
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| Title: | Effect of date of application on the efficacy of Dursban and Oftanol against annual bluegrass weevils, golf course fairway, 1993 |
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| Source: | Arthropod Management Tests. Vol. 19, 1994, p. 316. |
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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: Poa annua; Agrostis stolonifera; Listronotus maculicollis; Insect control; Insecticide evaluation; Application timing; Chlorpyrifos; Isofenphos
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| Abstract/Contents: | "Chlorpyrifos (Dursban 4E) and isofenphos (Oftenol 2F) were applied on 28 Apr (Forsythia in full bloom) or 10 May (Cornus florida in full bloom) or on both dates to 2 x 2 m plots, which were replicated 5 times and arranged in a CRD. The plots were established on a golf course fairway in Scarborough, NY-annual bluegrass (60%), creeping bentgrass (40%), maintained at 1.3 cm. All materials were applied with watering cans, using 2 liters of water per plot. The entire test area received 0.4-0.6 cm irrigation within 1 h after application on each date. Soil pH was 6.2, water pH of water used for application was 5.8 on 28 Apr, 6.0 on 10 May. Product efficacy was evaluated on 14 Jun by removing 12 soil cores (5.7 cm diam, 4 cm deep) per plot and inspecting the cores under magnification in the Amherst laboratory. Insect counts were made by combining totals from 3 plugs per recorded observation (4 observations per plot, 20 observation per treatment). At the time of sampling, the population was 18% 3rd instar, 24% 4th instar, 50% 5th instar, and 9% pupae. There was no significant difference in insect populations with Dursban applications made at 2 lb (AI)/acre or at 4 lb (AI)/acre, regardless of the application date. All of the applications made at the higher rate (4 lb (AI)/acre) reduced insect populations significantly relative to the untreated control, while only the later application at the lower rate (2 lb (AI)/acre) reduced the population significantly. Only the later application of Oftanol reduced the insect populations significantly relative to the untreated control. With all three treatments (two rates of Dursban, one rate of Oftanol), the plots receiving applications on both dates were not significantly different than either of the treatments which were applied on one date only. This would indicate that a dual application (at the rates tested here) would be difficult to justify, economically and environmentally." |
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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 the efficacy of Dursban and Oftanol against annual bluegrass weevils, golf course fairway, 1993. Arthropod Manage. Tests. 19:p. 316. |
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