Mating and survival of sterile Drosophila suzukii, in presence and absence of food

Drosophila suzukii (Matsumura) (Diptera: Drosophilidae) is a widely distributed pest species of soft-skinned fruits. Recent studies suggest the use of Sterile Insect Technique (SIT) as a control method for this species, however, many are the factors that can impact effectiveness of a SIT program, including environmental condition. Thus, we aimed to verify the influence of temperature and relative humidity on mating and survival of fertile and sterile D. suzukii, when insects were food provided or deprived. Highest mating rates were obtained when food provided flies (either fertile or sterile) were exposed to 25 ºC or 81-100% relative humidity, while extreme temperatures (10 and 35 ºC) and low humidity (below 60%) impaired mating. Overall, mating rate among food deprived flies was low in all temperatures and humidity levels tested, but fertile insects were more prone to mate when compared to sterile flies. Survival was negatively influenced by high temperatures, low relative humidity and food deprivation. The information present in this study is useful to be considered for transport and release of sterile D. suzukii.