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为解决高树测报和防治技术问题,1985—1988年,我们对马尾松毛虫在树上越冬的分布规律进行了研究。按照立地条件,危害程度,不同树高,冬季气温等条件分组,采取随机抽样的方法,用刀子、锉子等工具逐段去粗皮清查虫数。工作中先把0—1米树蔸部位的虫口查清,再伐倒分段调查,以避免误差。调查分别在武冈、隆回、新宁、邵阳等县进行,共调查89株,从中看出,马尾松毛虫在树上越冬有明显的分布规律,96.98％分布在树干上,枝上仅占3.02％,且95.93％分布在7米以下,又主要集中在0—4米的范围。
In order to solve the technical problems of high tree forecasting and control, from 1985 to 1988, we studied the overwintering distribution of Dendrolimus punctatus in trees. In accordance with the site conditions, the degree of harm, different tree height, winter temperatures and other conditions grouped by random sampling method, with a knife, file and other tools to paragraph by paragraph to check the number of rough skin pest. Work first 0-1 m tree 蔸 parts of the mouth to identify, and then cut down sub-investigation, in order to avoid errors. The survey was carried out in Wugang, Longhui, Xinning, Shaoyang and other counties, a total of 89 surveyed, we can see that the masson pine caterpillars over the winter there are obvious distribution patterns, 96.98% distributed in the trunk, branches only 3.02%, and 95.93% distributed below 7 meters, and mainly concentrated in the range of 0-4 meters.