电子束处理对不同虫态烟草粉螟的辐照效应

Irradiation Effects of Electron Beam on Ephestia elutella Hübner of Different Development Stages

为控制烟草粉螟对烟叶、卷烟的危害,利用不同剂量的电子束对烟草粉螟卵、幼虫、蛹、成虫进行辐照处理,研究了其辐照效应。结果表明:不同虫态的烟草粉螟对电子束辐照的敏感性不同,其敏感性依次为:卵>幼虫>蛹>成虫;完全阻止卵、幼虫和蛹发育为成虫的辐照剂量分别为175,325和1000 Gy;幼虫、蛹和成虫经电子束辐照处理后在一定时期内全部死亡,幼虫、蛹和成虫的致死率与辐照剂量呈正相关;成虫经600 Gy剂量辐照后其繁殖力为0,即无法产生下一代成虫,并且600 Gy的剂量辐照下可以阻止烟草粉螟卵、幼虫发育为成虫,600 Gy剂量辐照处理烟草粉螟蛹虽然其仍可以羽化,但羽化的成虫在辐照后第6 d就完全死亡。因此,600 Gy的剂量可以作为辐照防治烟草粉螟的最低有效剂量。

In order to control the damage by Ephestia elutella Hübner（E.elutella） to tobacco leaves and cigarettes,the effects of electron beam irradiation on the egg,larva,pupa and adult of E.elutella were investigated.The results showed that the life stages of E.elutella in the order of susceptibility to electron beam irradiation were egglarvapupaadult.The radiation doses which could prevent egg,larva and pupa from developing to adults were 175,325 and 1000 Gy,respectively.In addition,all of the larvae,pupae and adults would die in a period of time after irradiation,and the mortality of larvae,pupae and adults positively correlated with the irradiation of dose.A 600 Gy irradiation caused adults not able to produce offspring and prevented the development of eggs and larvae.All the adults would die in 6 days after emergence from pupae which had been exposed to 600 Gy irradiation.Therefore,600 Gy irradiation could be considered as the lowest effective dose for tobacco moth control.