Efficacy of plant protection products containing the botanical antifeedant, azadirachtin, against the large pine weevil (Hylobius abietis)

摘要

Two individual field trials in central and southern Scotland were used to test the efficacy of four different formulations of neem tree (Azadirachta indica) seed extract, against the forest pest the large pine weevil, Hylobius abietis. Weekly assessments over 8 weeks were made for one field trial which showed that feeding damage by the pine weevil can be reduced by applying neat formulations containing 5% and 1% AZA onto the seedling. Concentrations lower than these did not provide sufficient protection. Using an azadirachtin formulation known to significantly reduce damage, large scale field trials were used to assess damage at the end of the feeding peak for five different dilutions. All dilutions were found to reduce feeding damage significantly. Both trials were tested against the currently used synthetic chemical permethrin.