棉大卷叶螟主要生物学习性研究

Study on Biological Habit of Cotton Leaf Roller

本文通过对棉大卷叶螟生物学习性的研究观察,发现成虫多在夜间羽化,羽化当天或第二天晚上交配,交配时间多在夜间20:00～2:00,交配时雌雄个体附于攀附物上呈"-"字形,交配持续时间1～4h。交配后的成虫一般于第2天或第3天开始产卵,少数在第4天产卵。成虫不同世代、同世代不同雌虫产卵量差异大,从73～638粒不等。成虫性比随世代的不同有着一定变化,不同补充营养条件下的实验种群性比也有所不同。幼虫多在下午及夜间孵化,上午孵化量少,同一天产的卵孵化时间比较整齐。幼虫共有5龄,主要在夜晚蜕皮,5龄幼虫老熟后即觅地化蛹,预蛹持续期2～4d。

The paper by studying biological habit of cotton leaf roller, we found adult usually began eclosion at night, and started mating in the day of eclosion or the next day, the time was from 20：00 to 2：00, it continued 1 to 4 hours, and often oviposited after 2nd or 3rd day from its＇ mating, few after 4th day. The eggs laid by Female of different generations and different female of same generation was difference, the number of eggs laid by one female is from 73 to 638. The adult sex ratio was different with different generations or different plants in laboratory. The larvae usually hatched in afternoon and night, few in forenoon. The larvae had five instars, and exuviated at night, pupated at 5th instar old larvae, pupation time need 2 - 4 days.