Progress 08/15/05 to 09/30/06
Outputs
Progress Report 4d Progress report. This report serves to document research conducted under a grant agreement between ARS and Washington State University. Additional details of research can be found in the report for the parent project 5358-22000-032- 00D, Development of Biologically-Based Strategies for Managing Insect Pests of Horticultural Crops. Dr. Lynell Tanigoshi and collaborators conducted the following research towards the agreements objectives: Field efficacy of four registered adulticides and two experimentals, Mustang Max (zeta-cypermethrin), Clutch (clothianidin), were studied in a three-year-old Totem field in Brush Prairie, WA infested with rough strawberry root weevils (RSRW) and strawberry root weevils (SRW) and economic levels of weeds. Treatments were replicated four times, applied in 100 GPA with a tractor-mounted plot sprayer equipped with a three-row boom configured with six Turbo TeeJet 11006, wide angle flat spray tips and a central drop
hose/row equipped with 8006 TwinJet flat spray tips allowed to penetrate within the plant row canopy. This application configuration was designed to apply insecticides to where the RSRW resides in the soil, debris and crown foliage during the harvest period. Hand and knee field searches indicate the RSRW is often in a quiescent/non-feeding state from late June through August. Applications were made on 24 June 2005 to plots six rows wide and 50 feet long. Post treatment, naked-eye searches of four 2 ft2 samples per plot were made at 3 and 7 days after treatment. Compared with the untreated check, the percentage of live SRW for Brigade, Malathion, Actara, Provado and the two experimentals averaged between 45 to 80 percent at 7 DAT. Results for RSRW were judged acceptable with 3 and 7 DAT percentages live for Actara (14, 20%), Brigade (9, 7%), Clutch (14, 20%), Malathion (9, 20%), Mustang Max (9, 0%) and Provado (0, 7%). Given the weedy condition the field this last year, results for
adult RSRW control were excellent when applied with the nozzle configuration described above. Precision applications of three very systemic, neonicotinoid soil formulations were applied as 400 GPA drenches with a Hudson hand held sprayer (22 February) and a garden watering can (5 March). Applications were made in early March, 2005 with ten maturing root weevil larvae placed in soil-filled stainless steel strainers replicated five times and buried singly 2-3 inches deep alongside strawberry plants in 1 ft2 plots. Treatments consisted of 1 and 2X concentrations of experimental Belay (clothianidin), Platinum (thiamethoxam), 1 and 2X concentrations of Admire (imidacloprid) and Malathion. Larval mortality was assessed 7 days after application by sifting the contents of the tea strainers with water. As was expected, there were no linear trends between insecticides and mode of delivery of the tested compounds when applied to soil. Percent mortality for Malathion and Platinum drenches were
slightly less than Admire and Belay against late instar root weevil larvae. The Hudson sprayer-applied drenches showed the l lb(AI)/ac rate of Admire gave 70% morality compared with 68% for the 0.4 lb(AI)/ac rate of Belay. Whereas, the water can drenches showed a high of 90% larval mortality from Belay (0.8 lb(AI)/ac, followed by 69% for the lower rate of Belay.
Impacts
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Publications
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