3.Life Cycle of Small white butterfly >4-5 generations/year in northeast,Huabei and eastern northwest China;5-8 in mid- downstream of Yangtse River;8-9 in Changsha. Overwinter as pupae in all kinds of refuges near vegetable orchards,such as on fences, plant trunks and in soil gaps and weeds
¾ 4-5 generations/year in northeast, 5 generations/year in northeast, Huabei and eastern northwest China; 5 and eastern northwest China; 5-8 in mid 8 in middownstream of downstream of Yangtse Yangtse River; 8 River; 8-9 in Changsha. Changsha. ¾ Overwinter Overwinter as pupae in all kinds of refuges as pupae in all kinds of refuges near vegetable orchards, such as on fences, near vegetable orchards, such as on fences, plant trunks and in soil gaps and weeds. plant trunks and in soil gaps and weeds. 3. Life Cycle of Small white butterfly 3. Life Cycle of Small white butterfly
3.Life Cycle of Small white butterfly Causes severe damage in spring (April to June)and autumn (Sep.to Oct.)in most parts of China.Or July to Aug.in colder areas,especially higher altitudes. Overwintered pupae come to eclosion in March in mid- downstream of Yellow River.Newly hatched larvae appear in April.Damage peaks from May to June. Population decreases from Jul.to Aug.It increases again in Sep.Then the second damage peak appears,which is less severe than the first
¾ Causes severe damage in spring (April to June) and Causes severe damage in spring (April to June) and autumn (Sep. to Oct.) in most parts of China. Or July to autumn (Sep. to Oct.) in most parts of China. Or July to Aug. in colder areas, especially higher altitudes. Aug. in colder areas, especially higher altitudes. ¾ Overwintered Overwintered pupae come to pupae come to eclosion eclosion in March in mid in March in middownstream of Yellow River. Newly hatched larvae downstream of Yellow River. Newly hatched larvae appear in April. Damage peaks from May to June. appear in April. Damage peaks from May to June. Population decreases from Jul. to Aug. It increases again Population decreases from Jul. to Aug. It increases again in Sep. Then the second damage peak appears, which is in Sep. Then the second damage peak appears, which is less severe than the first. less severe than the first. 3. Life Cycle of Small white butterfly 3. Life Cycle of Small white butterfly
3. Adult Behavior of Small white butterfly Adults active during daytime. Favor sucking nectar. Attracted by mustard oil(芥子油)spread by cruciferous plants in fields. Deposit eggs individually on leaves;mostly on backsides in summer and mostly on faces in winter.Each female lays about 300-400 eggs
Adults active during daytime. Adults active during daytime. Favor sucking nectar. Favor sucking nectar. Attracted by mustard oil ( Attracted by 芥子油) spread by ) spread by cruciferous plants in fields. cruciferous plants in fields. Deposit eggs individually on leaves; mostly on Deposit eggs individually on leaves; mostly on backsides in summer and mostly on faces in backsides in summer and mostly on faces in winter. Each female lays about 300 winter. Each female lays about 300-400 eggs. 400 eggs. 3. Adult Behavior of Small white butterfly Adult Behavior of Small white butterfly