摘要
杨扇舟蛾是湘北平原湖区欧美杨人工林的重要食叶害虫之一,1年发生5代。主害代第3～4代(6～8月),每头幼虫的平均危害量分别达到143.27 cm^2和141.42cm^2。人工模拟第3代幼虫的危害状况,受害1次就能对当年材积生长造成极显著影响。经测定分析表明,50%的失叶量为受害的允许临界值。并确定第2代幼虫的防治指标为3头/100片叶,第3～4代幼虫的防治指标为20头/100片叶。
Clostera anachoreta is one of the chief defoliators of Populus× euramericana in the region of Dongting Lake. The pest break out 5 generations a year. The most active populations break out at the third and fourth generations (June-August). On average, each larva of the third generation can harm 143.272cm^2 of leaf, and each larva of the fourth generation can damage 141.416cm^2 of leaf. Simulation shows that the poplar will suffer significant loss in increment of the timber volume even if it is damaged by the pest for only one time. The permissibility of leaf damage is also determined, and the critical value is 50 per cent. As for the indices of control, the second-generation caterpillars should be checked within 3 larvae per 100 pieces of leaf, whereas the third and fourth generations 20 larvae per 100 pieces of leaf.
出处
《中南林学院学报》
CSCD
1993年第2期158-163,共6页
Journal of Central South Forestry University
关键词
杨扇舟蛾
防治
食叶害虫
Clostera anachoreta, index of pest control, defoliator, Populus× euramericana, plantation
