落叶松丝角叶蜂的生活习性及防治

１９９０年以来，落叶松丝角叶蜂在山西省太行山林局为害落叶松林，以幼虫取食当年嫩叶。该虫一年发生一代。６月下旬老熟幼虫吐丝下垂在枯枝落叶层内结茧越冬。翌年４月下旬开始化蛹，５月上旬至６月上旬陆续羽化，５月中下旬为产卵盛期，５月下旬至６月上旬为卵孵化盛期，防治试验结果表明，６月上旬，以林丹喷粉，幼虫死亡率可达９５％以上，见效快，且经济。

Life Habit and Control of Nematus sp.

Since 1990, Nematus sp. has been found to damage the larch forest in the way that the larva fed on the annual leaves in Taihang Mt. Shanxi province. It occurs one generation a year. In last June, the old larva got down to the litter to cocoon and overwinter. The pupal stage started in last April of the next year,and the emergence period was from early May to early June.The spawning time was in middle May and the incubation period was from last May to early June.The result of control experiment showed that dusting lindane in early June was a effective and economical measures to control this insect,the larva death rate could amount to 95%.