缙云山位于重庆北碚,是全国重点自然保护区之一,素有“小峨嵋”之称。1986年—5月间,出现一次暴发性虫灾,数千亩林木树叶被吃光,用13吨农药防治仍未见效,因虫害致死而被砍伐的木材约200立方米。经调查,这次虫灾的优势虫种为一种尺蠖(种名待鉴定),1975年春少量出现,1986年暴发成灾。这 Jinyun Mountain is located in Chongqing Beibei, is one of the national key nature reserves, known as “small Emei” said. Between 1986 and May, an outbreak of pest extermination occurred. Thousands of acres of trees and leaves were eaten, 13 tons of pesticides were still on the battlefield, and about 200 cubic meters of timber were harvested for infestation. After investigation, the insect pests for the advantages of a kind of wormwood (species to be identified), a small amount in the spring of 1975, the outbreak of disaster in 1986. This