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杨卷叶螟Botyodes diniasalis Walker是杨柳科的主要害虫之一,以幼虫卷叶为害,常吐丝把邻近几片树叶包裹成团,幼虫在树叶丛间取食。据实地观察幼虫喜食苗木的顶梢嫩叶,大发生时3—5日内即可把嫩叶吃光,形成秃梢,严重影响苗木的正常生长。1982年7月下旬,凤山国营苗圃,40亩当年生北京杨插条苗木(平均高2.3米,平均胸径2.1厘米)遭受此虫为害。为寻求经济有效的防治方法,我们于1982年8月上旬,采取了不同
Botyodes diniasalis Walker is one of the main pests of the genus Mytilus, which infects the larvae. Leaves are often lined with clusters of larvae and the larvae feed on the foliage. According to the field observation of larvae edible seedlings top tip of young leaves, large when 3-5 days to eat young leaves, the formation of bald, seriously affecting the normal growth of seedlings. In late July 1982, Fengshan state nursery, 40 acres of current Beijing poplar seedlings (average height 2.3 m, average diameter 2.1 cm) suffered this pest. In order to find a cost-effective prevention and control method, we adopted a difference in early August 1982