Ecorational insecticides and compensatory growth responses for crucifer flea beetle management in canola.

摘要

tudies were undertaken to determine the efficacy and economic potential of ecorational insecticides versus conventional insecticides as alternative management tactics for crucifer flea beetle, Phyllotreta cruciferae (Goeze). Yield to feeding injury relationships and compensatory growth responses were also determined for actual and simulated P. cruciferae feeding injury. Percent mortality, pairwise comparison analysis and LT50 values showed the efficacy to be in descending order of Helix XTra > Capture > SpinTor > BotaniGard > Neemix > Surround. LT50 values were 1 to 4 d after exposure to Helix XTra, Capture and SpinTor; and 2 to 7 d for BotaniGard, Neemix and Surround. Field studies showed that SpinTor had the best efficacy against the crucifer flea beetle among the ecorational insecticides tested. Using partial budgets analysis, the ecorational insecticides SpinTor, BotaniGard, Neemix and Surround, when substituted for the chemical insecticide Helix XTra, resulted in net losses of