| Abstract/Contents: | "This trial was conducted on a bentgrass green at Farmington Country Club, Farmington, NH. Each treatment was replicated four times, using 6-inch diameter PVC cylinders (28 sq inches), arranged in a RCB design. For each subplot, six cylinders were marked A1, A2, A3, B1, B2, B3, and placed in the subplots within the block. On 7 Sep, the A cylinders were infested with 10 larvae each, and covered with a 60%-shade netting. On 8 Sep the netting was removed from the A cylinders. Three rates of aqueous Provaunt and one rate of aqueous Talstar were then applied to the A and B cylinders. The B cylinders were then infested with 10 BCW larvae each. All of the cylinders were covered with the netting. The larvae used for this trial were second - third instar. Treatments were applied using a 32-fl oz hand-pump sprayer, at a vol of insecticide and water of 2 gal/1000 ft2. There was no precipitation within 24 hr prior to, or after the applications; none of the treatments were watered. The soil conditions were as follows: texture, loamy sand; sand, 83%; silt, 9%; clay, 8%; organic matter, 1.6%; moisture, 10.9%; pH, 6.1; surface temp, 75°F; at 1-inch depth, 78°F. Weather conditions were as follows: sky, partly cloudy; wind, less that 5 mph; air temp, 71°F. The trial was rated for live BCW larvae by removing the cylinders marked 1, 2 and 3, at 1 DAT, 2 DAT and 3 DAT, respectively. Live larvae that were not sitting on the green surface were forced out of the turf by a solution of Joy dish soap and water poured onto the green. Data were subjected to ANOVA and means were separated using DMRT (P ≤ 0.05). The analysis of the data show that Provaunt was less effective at controlling BCW exposed to freshly treated turf than the standard Talstar. At 1 DAT and 2 DAT, Provaunt gave significantly less control than Talstar in the B cylinders (Table 1). By 3 DAT, there was no difference between Talstar, and Provaunt at the high rate (0.108 lb) (Table 2). However, when larvae were directly treated (A cylinders), the high rate (0.108 lb) of Provaunt performed as well as the standard Talstar (96.2% versus 100% control) at 1 DAT (Table 1). The medium rate of Provaunt (0.54 lb) required two days to equal Talstar. These data suggest, since contact activity of Provaunt is less than the standard pyrethroids (Talstar), cutworms entering from outside the treated area will not be controlled as quickly. Control with Provaunt took 1 to 3 days, depending on the rate." |
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