Occurrence and life-history of Melanagromyza sojae on soybean.
Field and laboratory observations were made on the biology of Melanagromyza sojae (Zhnt.) on soyabean at Taichung, Taiwan, in the spring of 1978 and 1979. The agromyzid attacked 50% of the plants in the field within 40 days of planting and was considered to be a serious pest of the crop. In the laboratory at 24.5 deg C and 75-90% RH, the egg stage lasted 2-7 days, the 3 larval instars 2.3, 2.5 and 2.9 days, respectively, and the pupal stage 6-12 days. Natural mortality of larvae in the 3 instars was 62.1, 24.1 and 20.0%. At 25.6 deg C and 70-90% RH, adult life-span was 19 days and females laid an average of 171 eggs.