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刺槐外斑尺蛾Extropis excellens Butler一年发生4代,以蛹在土中越冬。翌年4月上旬成虫开始羽化、产卵。第2代卵出现在5月中旬,第3代卵出现在7月上旬,第4代卵出现在8月中旬,第4代幼虫危害至9月下旬开始入土化蛹越冬。
Extropis excellens Butler occurs 4 generations a year, pupa in winter in the soil. In early April the following year, adults begin to emerge and spawn. The second generation of eggs appeared in mid-May. The third generation of eggs appeared in early July. The fourth generation of eggs appeared in mid-August. The fourth-generation larvae harmed the pupation beyond winter in late September.