辐射不育棉铃虫交尾习性和交尾竞争能力的观察

对棉铃虫经３００ Ｇｙ γ射线照射后的成虫交尾习性和性竞争能力进行了观察。结果表明，在室内饲养条件下，棉铃虫成虫的交尾时间大多在清晨４ ～７ 时，少数在凌晨２ ～３ 时或早上８ ～９ 时，较田间野生种群在时间上延后２５ｈ 左右。不育虫的交尾习性和交尾竞争能力与正常虫无明显差异，但不育虫的有效交尾率为６１６ ％ ， 与正常虫相比减少１／３ 。辐射不育棉铃虫一生交尾次数大多为１ 次，少数达２ ～３ 次，最多达５ 次，可认为辐照不会改变其多配性的特点。辐射不育技术作为棉铃虫综合防治的措施是可行的。

INVESTIGATION ON MATING HABIT AND SEXUAL COMPETITION ABILITY OF HELICOVERPA ARMIGERA STERILIZED BY IRRADIATION

Mating habit and sexual competition ability of helicoverpa armigera irradiated with 300 Gy of γ rays were observed. The results showed that when reared in labratory,most adults mated at 4～7 o'clock, a small proportion of adults mated at 2～3 o'clock or at 8～9 o'clock in the morning, meanwhile wild population mated two and a half hours earlier than labratory populations did. No difference in mating habit and sexual competition ability was found between the irradiation sterilized and normal adults except that the effective mating rate of the former was 61 6%, one third less than that of the latter ones. Most irradiation sterilized adults mated one time in their whole lives, only a few could mate 2～3 times and even 5 times, indicating that the multi mating characteristic of Helicoverpa armigera was not changed by irradiation. It can be concluded that irradiated sterile insect technique is feasible for integrated controlling the cotton bollworm.