1a.Objectives (from AD-416):
Establish baseline responses to insecticides where feasible and evaluate longer term performance to safeguard against resistance development. Incorporate resistance management strategies into pest management programs for particular pests of cotton and associated crops including silverleaf whitefly, glassy-winged sharpshooter, and Lygus spp.
1b.Approach (from AD-416):
Develop bioassay methods for various insect pests that realistically depict the type of exposures that occur in the field. Collect target pests in their crop habitat and establish and maintain cultures for repetitive testing. Evaluate relative susceptibilities to crucial insecticides by examining dose-mortality responses of immature and adults stages. Determine stability of resistance when it occurs in populations and formulate effective strategies for mitigating resistance by incorporating information on resistance stability. Documenst SCA with UC Riverside. Formerly 5347-22620-017-12S (6/09) & 5347-22620-018-02S (12/09) & 5347-22620-017-14S (12/10).
This is the final report for project 5347-22620-021-06S. This Specific Cooperative Agreement is in support of Objective 5 – Refine insecticide-based management strategies; characterize factors influencing resistance to chemical insecticides and insecticidal proteins in transgenic crops; evaluate insecticide selectivity; support post-eradication pink bollworm resistance monitoring in Bt cotton, of the approved in-house project. The bagrada bug, Bagrada hilaris, is an invasive pest now widely established in agricultural regions of California and Arizona. This pest occurs in various crops throughout the year, but early-season populations concentrate in cole crops, often resulting in severe damage to young plants. Crop losses have been difficult to minimize, in part because of a lack of information regarding effective insecticides that can protect young crops from sudden and dramatic pest invasions. Numerous insecticide products, representing multiple modes of action, were tested in field trials and laboratory bioassays. Both field and laboratory studies showed the pyrethroid, bifenthrin, is the most effective chemical treatment so far evaluated against the bagrada bug. The determination of baseline responses of the bagrada bug to insecticides used in commercial field operations will provide a valuable reference to consultants and researchers in efforts to monitor for pesticide resistance and in management of this invasive pest.