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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 date 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. 285-286. |
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| Publishing Information: | Annapolis, MD: Entomological Society of America |
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| # of Pages: | 2 |
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| Abstract/Contents: | "Ethoprop (Mocap 10G), imidacloprid (Merit 75SP), isazophos (Triumph 4E) and isofenphos (Oftanal 2F) were applied on 18 Apr (Forsythia in early bloom) or 2 May (Cornus florida in early 'full bloom') to 7 X 7 ft plots, which were replicated 5 times in CRB design. The plots were established on a golf course fairway in Scarborough, NY consisting primarily of annual bluegrass (30-40%) and creeping bentgrass (60-70%) 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 inch irrigation ca. 1 h after application of the last material on each date. Soil pH was 6.3, water pH of water used for application was 6.2 on 18 April and 6.4 on 2 May. Product efficacy was evaluated on 6 Jun by removing 2 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 25% early instars (1st-3rd), 25% 4th instar, and 50% 5th instar. None of the treatments was significantly different from the untreated control. Population reductions were in the range of 0 to 60%, with only one treatment (Mocap 10G on the May application) providing more than 70% control. Population pressure was low to moderate (28 larvae per sq. ft. in the untreated control), so all of the plots (including the control) had 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 early spring application and most larvae were still in the grass stems at the time of the second application." |
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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 date of application on efficacy of four insecticides against annual bluegrass weevils, golf course fairway, 1994. Arthropod Manage. Tests. 20:p. 285-286. |
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