1a. Objectives (from AD-416):
1) Conduct preliminary laboratory tests and develop small field plot bioassays to evaluate soil treatments for efficacy against MFF, OFF, and MF. 2) Conduct field tests of most promising diazinon replacements against larvae and pupae of MFF, OFF, and MF.
1b. Approach (from AD-416):
1) Obtain insecticides. 2) Begin laboratory screening against Mediterranean fruit fly, oriental fruit fly, and melon fly larvae and pupae. 3) Begin field plot studies. 4) Summarize and publish results.
3. Progress Report:
The goal of this agreement is to develop small field plot bioassays to evaluate soil treatments for efficacy against melon fruit fly (MFF), oriental fruit fly (OFF), and medfly (MF), which contributes to Objective 6 of the in-house project. Conventional fruit fly control methods such as bait sprays, male annihilation, and ground treatments rely heavily on organophosphate insecticides. Continued registration of many organophosphate insecticides for use in the U. S. is in doubt. A current example is the loss of diazinon as a ground treatment for fruit flies. Previously, we conducted laboratory soil treatment studies of the following non-organophosphate products for three species of fruit flies (Mediterranean fruit fly (MFF), oriental fruit fly (OFF), and melon fly (MF)): Admire (Imidacloprid), Regent (fipronil), Force (Tefluthrin), Platinum (Thiamethoxam), and Warrior (Lamda Cyhalothrin). These insecticides were compared to Diazinon Ag 500. Force and Warrior were the most promising insecticides for all 3 fruit fly species. Regent was a good control for OFF and MF. Admire and Platinum were good controls for MFF and OFF. In the present study, we are doing additional studies of six promising compounds: Warrior II (Lambda-Cyhalothrin), Gardstar (Permethrin), Cyazypyr (Cyantraniliprole), Entrust (Spinosad), Intrepid 2F (Methoxyphenocide) and Radiant (Spinetoram) in the laboratory for replacement of diazinon against MFF, OFF, and MF. The efficacy of the test compounds will be compared to that of Diazinon Ag 600. Subsequently field plot efficacy tests will be conducted. These studies are important to fruit fly area-wide suppression/eradication programs worldwide.