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为了摸清益鸟在纯松林中对马尾松毛虫的抑制作用,我们于1982年4—8月在安徽省全椒县瓦山林场5万余亩纯松林中,对越冬代马尾松毛虫定点、定株、定时留虫和放虫观察,现将观察的结果分述如下。
In order to find out the inhibitory effect of the beneficial bird to Pinus massoniana in pure pine forest, we fixed the overwintering dendrolimus punctatus from April to August in 1982 in the 50,000-hectare pure-pine forest of Wushan Forest Farm in Quanjiao County of Anhui Province Strain, timing insects and pest repellent observations, the results will now be observed as follows.