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纵卷叶螟绒茧蜂Apanteles cypris Nixon是稻纵卷叶螟幼虫的优势种天敌。它寄生低龄幼虫,能把害虫消灭在暴食阶段之前,现将二年来的观察结果整理如下。 一、田间消长 通过饲养调查,稻纵卷叶螟的幼虫自然寄生率,二代为6.9—18.75％、三代为28.75—30.3％、四代为4.78—11.9％。 田间消长情况:据1977年调查,纵卷叶螟绒茧蜂于6月下旬初见,11月消失。田间总的趋势是低、高、低(表1)。
Apanteles cypris Nixon is the dominant species of rice leaf roller larvae. It parasites young larvae, pests can be eliminated before the gluttony stage, the results of two years are now organized as follows. First, the field of growth Through the feeding survey, the natural larval rice leaf roller borers, the second generation of 6.9-18.75%, three generations of 28.75-30.3%, four generations of 4.78-11.9%. Field growth and decline: According to a survey conducted in 1977, the leafhopper Culex pipiens pallens first saw it in late June and disappeared in November. The overall trend in the field is low, high and low (Table 1).