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田间采集老熟幼虫或蛹,在室内分时段观测杨扇舟蛾成虫羽化、交尾和产卵规律。结果表明:杨扇舟蛾在河北沧州地区1 a发生4代,个别5代。成虫主要在傍晚羽化,雄虫羽化高峰出现在15:00—18:00,雌虫在18:00—21:00,单体成虫羽化需13～28 min。雌虫自羽化至初次交尾时间为34.82～54.62 h,成虫交尾起始时间在04:00—05:00,交尾结束时间在19:01—20:00,整个交尾持续时间15.4～16.17 h。雌雄成虫均可进行2次交尾,交尾高峰期和羽化高峰期相差7～11 h。成虫羽化后多在第2和第3天交尾,7日龄以后雌虫不再释放性信息素与雄虫交尾。雌虫交尾后大多当晚或第2天晚上产卵,产卵时间主要集中在20:00—24:00,产卵方式为块产,个别单产。单个卵块平均卵量50～80粒,卵块单层平铺,总卵量220～420粒。雌虫可孤雌产卵,但卵不能孵化。
Mature larvae or pupae were collected in the field, and the emergence, mating and oviposition of adults of Anopheles stephensi were observed indoors. The results showed that the genus Helicoverpa armigera occurred 4 generations a year in Cangzhou, Hebei Province, with 5 generations each. The adults mainly emerge in the evening, the male emergence peak appears at 15: 00-18: 00, the female at 18: 00-21: 00, and the adult adults need 13-28 min. Females migrated from emergence to initial mating for 34.82-54.62 h, adult mating start time was 04: 00-05: 00, mating end time was 19: 01-20: 00, and the entire mating duration was 15.4-16.17 h. Male and female adults can be 2 mating, the peak of mating and emergence of the peak difference of 7 ~ 11 h. After the emergence of adults more than 2 and 3 days of mating, after 7 days of age female no longer release pheromone and male mating. Most females lay their eggs on the night or the second night after mating, oviposition time is mainly concentrated in the 20: 00-24: 00, spawning way to block production, individual yield. The average number of eggs of a single egg 50 to 80, egg monolayer tiling, the total amount of 220 to 420 eggs. Female parthenogenetic eggs, but eggs can not hatch.