Abstract
Egg and nymphal periods and body size (body length and pronotal width) of emerged Orius sauteri (POPPIUS) adults were examined under 16 L : 8 D combined with four different temperatures : 15, 22, 25 and 30°C. First and second instar nymphs of Myzus persicae SULZER on potato leaflets were used as prey. The mean developmental time at 15, 22, 25, and 30°C was 15.2, 5.2, 4.3 and 3.1 days for the egg, 48.2, 14.7, 11.6 and 8.8 days for the nymph, and 63.4, 19.9, 15.9 and 11.9 days for the period from egg to adult emergence, respectively. The developmental threshold and effective accumulative temperature were calculated to be 11.0°C and 58.8 day-degrees for the egg, 11.3°C and 163.9 day-degrees for the nymph, and 11.4°C and 220.9 day-degrees for the period from egg to adult emergence, respectively. The body size of the female was always larger than the male at each temperature. The higher the temperature, the smaller the body size in both sexes.
