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10-Minute Paper

Physiology, Biochemistry, and Toxicology

PBT: Cold Physiology and Nucleotides

Cold storage of Ganaspis brasiliensis immature stages for optimized classical biological control of Drosophila suzukii

Sunday, November 5, 2023
11:12 AM – 11:26 AM ET
Location: Gaylord National Resort & Convention Center, National Harbor 11
In-Person
The importation, rearing and release of the Asian parasitoid Ganaspis brasiliensis (Ihering) (Hymenoptera: Figitidae) is ongoing in the major countries threatened by its host Drosophila suzukii (Matsumura) (Diptera: Drosophilidae). Despite wasp mass rearing and release planning are expensive and time-consuming procedures, cold storage could optimize parasitoid production and the host-parasitoid synchronization during field releases. In this study we tested the effects of low temperatures (10 and 15 °C) and four cold exposure times (2, 4, 6, 8 weeks) on the development time and emergence rate of G. brasiliensis exposed at larval, pupal and pharate stages. Results showed that storage of G. brasiliensis at larval stage at 10°C for 2, 4 and 6 weeks would allow to delay wasp adult emergence by 12, 20 and 35 days, respectively, but reducing emergence rate by 25%. Parasitoid pupae can be successfully stored at 15 and 10°C for 2 weeks without affecting their viability and delaying adult emergence by 15 and 17 days. These findings provide new insights on the parasitoid susceptibility to low temperatures and provide multiple options to better schedule mass rearing and wasp releases close to the fruit growing season.