Effect of temperature on the development of the potato moth Phthorimaea operculella Zell. (Lepidoptera, Gelechiidae).
The results are given of laboratory investigations in the Republic of Georgia on development and reproduction of Phthorimaea operculella at temperatures between 10 and 35°C. Potato tubers were provided as food for the larvae. The results showed that development occurred within a fairly wide range but that at lower temperatures development times increased, hatching became increasingly asynchronous, activity of the newly emerged larvae decreased, pupal weight increased and the coloration of the adults became darker, until at 10°C, 60-70% of eggs and almost all larvae died. The optimum for development was 10-25°C. At 25-25°C males died before females, whereas at 15-20 °C males lived longer than females. The upper and lower thresholds and optimum for oviposition were 28-30, 13 and 20-25°C, resp.