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| Publication Type:
| Report |
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| Author(s): | Vittum, P. J. |
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| Author Affiliation: | Department of Entomology, Fernald Hall, University of Massachusetts, Amherst, MA 01003-2410 |
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| Title: | Effect of rate of application on efficacy of four insecticides against annual bluegrass weevils, golf course fairway, 1994 |
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| Section: | Ornamentals
Other records with the "Ornamentals" Section
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| Source: | Arthropod Management Tests. Vol. 20, 1995, p. 286. |
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| Publishing Information: | Annapolis, MD: Entomological Society of America |
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| # of Pages: | 1 |
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| Abstract/Contents: | "Ethoprop (Mocap 10G), imidacloprid (Merit 75SP), fonofos (Crusade 5G), and bendiocarb (Turcam 2.5G) were applied on 18 Apr (Forsythia in early bloom) to 7 X 7 ft plots, which were replicated 5 times, in a CRB design. The plots were established on a golf course fairway in Scarborough, NY - annual bluegrass 50%, creeping bentgrass 50% maintained at 0.5 inch mowing height. All materials were applied by hand. Granular formulations were applied using glass jars with perforated lids. Liquid formulations were applied with watering cans, using 2 qt water per plot. All applications were made by applying ca. half of the material in one direction and then applying the remainder in the perpendicular direction. The entire test area received 0.25 in irrigation ca. 1 h after application of the last material. Soil pH was 6.4, water pH of water used for application was 6.1. Product efficacy was evaluated on 6 Jun by removing 12 cores (1.85 inch diam, 1.5 inch deep) per plot and inspecting the cores under magnificantion in the Amherst laboratory. Insect counts were made by combining totals from 3 plugs per recorded observation (4 observations per plot, 20 observations per treatment). At the time of sampling, the population was 60% early instars (1st-3rd), 20% 4th instar, and 20% 5th instar. None of the treatments was significantly different from the untreated control. Population reductions were in the range of 48 to 68%, which is below the preferred level of control of 70 to 80%. Population pressure was high (228 larvae per sq. ft. in the untreated control), and none of the treatments reduced the populations below the currently accepted threshold of 30 to 50 weevils per sq. ft. The application date may have been too early - most weevils were present as ovipositing females at the time of the application. The insecticides used in this trial apparently did not have a marked effect on those females, and did not have sufficient activity against the subseqent population of larvae, which feed inside grass stems during the first two instars." |
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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. 1995. Effect of rate of application on efficacy of four insecticides against annual bluegrass weevils, golf course fairway, 1994. Arthropod Manage. Tests. 20:p. 286. |
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