Log Bioassay of Residual Effectiveness of Insecticides Against Bark Beetles

摘要

Residual effectiveness of nine insecticides applied to bark was tested against western, mountain and Jeffrey pine beetles. Ponderosa and Jeffrey pine trees were treated and longs cut from them 2 to 13 months later, and bioassayed with the three beetles. The insecticides were sprayed at the rate of 1 gal (3.81) per 40- or 80- cuft2 bark surface at varying concentrations. Effectiveness of treatment was based on reduction in length of egg galleries 2 to 3 weeks after initiating bioassay. All chemicals were quite effective for 2 to 13 months, except for malathion and Imidan which were relatively ineffective, depending largely on concentration and application rate.