1a. Objectives (from AD-416):
The main objective is to assess the effects of ionizing radiation on important invasive pests such as the light brown apple moth, spotted wing drosophila, and European grapevine moth.
1b. Approach (from AD-416):
Dose response test will be conducted with various life stages of each species to determine a radiation dose that retards development or sterilizes adults. Large scale tests with the most tolerant stage of the insect will validate whether the radiation dose provides quarantine security.
3. Progress Report:
The goal of this agreement is to assess the effects of ionizing radiation on important invasive pests such as the light brown apple moth, spotted wing drosophila, and European grapevine moth, which contributes to objective 1 of the in-house project. Light brown apple moth, Epiphyas postvittana (LBAM) and spotted wing drosophila, drosophila suzukii (SWD) are recent invasive pests introduced to California with the potential to spread widely in North America. LBAM populations have been contained in California through the use of inter and intra-state quarantines, but SWD spread quickly to more than a dozen states and continues to spread. A major concern with LBAM and SWD is trade restrictions on fruits and vegetables imposed by importing countries, such as Canada and Mexico. Irradiation is a postharvest quarantine treatment option for exported commodities such as fruits and vegetables to prevent movement of viable LBAM and SWD and prevent trade interruptions. The LBAM fifth instar is the most radiotolerant stage in fruit and a dose of 150 Gy was shown to provide quarantine control. The SWD late pupa is the most tolerant stage in fruit and dose-response studies suggest a dose of 60 Gy will sterilize the adult and provide quarantine control. Studies with European grape vine moth (EGVM) are just underway.