| Abstract/Contents: | "Merit, Oftanol, Tempo, Turcam, and Triumph were tested for efficacy against annual bluegrass weevil larvae on a golf course fairway in Scarborough, New York. The fairway consisted of 60% creeping bentgrass, 30% annual bluegrass, 10% perennial ryegrass, and was mowed at ca. 0.8 inches. Treatment plots were 7 ft by 7 ft, replicated 5 times, arranged in a RCB. All applications were made between 9:15 and 10:45 AM on 17 Apr 95. Liquid formulations were applied by hand with a watering can, 3 liters per plot. Conditions at the time of application were as follows: air temp. 55°F, sunny, calm; soil temp. (2 inch), 48°F; forsythia at peak blossom; soil type, silty loam; soil pH 6.5; water pH, 7.4; thatch 0.6 inch thick with moderate density. The trial was irrigated with 0.1 inch water 90 min after application. Product efficacy was evaluated on 30 May (43 DAT) by inspecting 12 cores (2.1 inch diam) from near the center of each plot, and recording the number of small (1^D]st, 2ⁿd, or 3^D]rd instar), medium (4^D]th instar), and large (5^Dth instar) larvae, pupae, and adults. At the time of sampling, the population was: 60% small larvae, 25% medium larvae, 15% large larvae. Each observation consisted of 3 cores, and there were 4 observations per plot. All applications were made as adult weevils were migrating to turf sites, and targeted toward pre-oviposition females. Several of the treatments reduced weevil populations significantly relative to the untreated control. Merit + Tempo, applied as a tank mix, provided 100% control. While this was not significantly better than either material alone, it was notable because 100% control is seldom obtained with this insect. The labeled rate of Oftanol and the lower rate of Turcam failed to reduce populations significantly." |
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