银杏大蚕蛾俗称白毛虫,近几年在保康县危害猖獗。1990年危害核桃、漆树、银杏等树种的面积达1万亩,损失价值3万元。1991年蔓延扩大至9个乡镇53个村,危害面积达5. 5万亩,损失价值142万元。是我县林业生产上第一大虫害。为了摸清银杏大蚕蛾在我县发生发展规律,我们于1991年对此进行了专题调查,现将情况总结如下。 Ginkgo biloba moth commonly known as white caterpillars, in recent years, rampant in Baokang County. In 1990 endangered walnut, tree, ginkgo and other tree species of an area of ​​1 million mu, the value of the loss of 30,000 yuan. The spread spread in 1991 to 53 villages in 9 townships, with an area of ​​5.5 million mu and a loss value of 1.42 million yuan. Is the county’s forestry production in the first pest. In order to find out the law of occurrence and development of Ginkgo biloba moth in our county, we carried out a special investigation in 1991, and the present situation is summarized as follows.