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近年来,银杏大蚕娥(Dietyopvoq japonien Moove)严重为害我县核桃,直接影响核桃产业的发展。为明确银杏大蚕娥在本地的生活习性及发生规律,笔者进行了田间调查和幼树套网饲养,得到成虫,经鉴定为银杏大蚕蛾,查阅大量资料,没有为害核桃的报到。为此对为害核桃的原因及防治技术做了3年研究。该虫在甘肃康县年发生一代,以卵越冬,卵期190d,幼虫期80d,以幼虫暴食夏初嫩叶为害,以蛹越夏,蛹期70～75d,有成虫时间持续50～60d,成虫产卵后初冬死亡。并查明银杏大蚕蛾在该县猖獗为害的原因,认定为本地森林害虫。发生原因是栽培管理不当,生态条件破坏,暖流气候影响和种群数量增加4种因素所致。暴发为害原因是核桃树成为最适新寄主。经综合防治试验,以农业防治、物理防治、药剂防治相结合,取得了良好的防治效果。
In recent years, Dietyopvoq japonien Moove has seriously damaged the walnut in our county, which has a direct impact on the development of the walnut industry. In order to clarify the local habits and laws of Ginkgo biloba, in this paper, the author conducted field surveys and saplings breeding to obtain adults. After identification as large ginkgo silkworm moth, access to a large amount of information, there is no report of damage to walnuts. To do this for the reason and prevention and treatment of walnut damage done 3 years of research. The insects occurred in Kangxian County, Gansu Province in a generation, with the egg overwintering, oviposition 190d, larvae 80d, larvae damaging early summer leaves damage to the pupal more summer, pupal 70 ~ 75d, adult time lasted 50 ~ 60d, Adult early winter death after spawning. And find out why the giant silk moth in the county is rampant and identified as a local forest pest. Occurred due to improper cultivation and management, the destruction of ecological conditions, the impact of warm climate and the population increased by 4 factors. The reason for the outbreak is that the walnut tree has become the most suitable host. After comprehensive prevention and control experiment, with agricultural prevention and control, physical prevention and treatment, combined with chemical control, and achieved good control effect.