Fig. 1. Sterility curves, after logistic adjustment as a function of growth temperature for two temperate (Prunay and Draveil) and two tropical (Niamey and Delhi) populations. Each point is based on the data from 50 males grown in at least three different vials. Characteristic values for Prunay and Delhi are given in Table 2. For Draveil and Niamey, the slope coefficients at inflection point (SIPs) are, respectively, 11.21±1.56 and 3.51±0.32, and the temperatures at inflection point (TIPs) are 29.22±0.03°C and 30.24±0.03°C.