Influence of different temperatures on the tachinid parastite,Sturmiopsis inferens [Dip.]

The influence of constant temperatures of 27, 29, 31 and 33°C and alternating temperature of 31/33°C (18/6 h) onSturmiopsis inferens Townsend was studied during 12 successive generations. The larval and pupal periods for male parasites were 13.5±0.5 and 11.0±0.3 days respectively and for female 12.8±0.5 and 11.1±0.3 days respectively in the 1st generatioin at 27°C. It decreased progressively with increase in temperature. Survival of females, fertility and fecundity were adversely affected at higher temperatures. A temperature range of 27–29°C appeared to be optimum for mass rearing of the parasite in the laboratory. The higher premature mortality observed at a constant 33°C was not observed at temperatures fluctuating between 31/33°C. Presumably under field conditions, where temperature is constantly fluctuating, the flies will be able to withstand a comparatively higher temperature.