牯牛降自然保护区座落于石台和祁门两县交界处。海拔800m至主峰均有黄山松分布。近年来黄山松遭到松针小卷蛾的危害,虫害由主峰开始逐渐向低海拔地区蔓延,面积逐年扩大,1994年已达4500余亩。黄山松受害程度随海拔的升高而加重,主峰虫株率高达100%,单株虫口万余条,松针损失率达90%以上。黄山松松针小卷蛾一年一代,以幼虫吐丝缀叶成苞在内危害,虫体隐蔽,自然死亡率较低,10月下旬开始吐丝下垂入土越冬,翌年6月成虫羽化。针对牯牛降虫害严重,省、地、县林业部门十分重视,组织技术人员考察现场、提出对策。于1994年10月针对性地在主峰,采取氰戊菊酯烟剂化学防治。目前保护区管理单位正密切监视虫情,开展基础研究,力争使虫害损失降低到最低程度。 牯 cattle drop Nature Reserve is located in Shitai and Qimen two counties at the junction. 800m above sea level to the main peaks are Pinus taiwanensis distribution. In recent years, Pinus taiwanensis has been endangered by pine needles, insect pests began to gradually spread from the main peak to the low altitude areas, and the area has been expanding year by year. In 1994, it reached 4,500 mu. The damage degree of P. dahurica aggravated with the elevation increasing. The main peak insect strain rate was as high as 100%. The number of insect population per plant was more than ten thousand, and the loss rate of pine needles reached more than 90%. One-year-old Pinus taiwanensis pine needles, with larvae sprout silkworm bud endocarpus endangered, insects hidden, natural mortality is low, in late October began to spit silk drooping into the soil overwintering, adult feathers in June the following year. In view of the severe cow drop pests, the provincial, prefectural and county forestry departments attach great importance to organize technical personnel to inspect the site and put forward countermeasures. In October 1994 targeted at the main peak, to take fenvalerate smoke chemical control. At present, the reserve management unit is closely monitoring the insects and conducting basic research so as to minimize the pest losses.