稻纵卷叶螟的经济损害水平和经济阈值

Economic Iuiury Levels and Economic Thresholds for the Rice Leaf-roller, Cnaphalocrocis medinalis Guenee

以室内接虫、剪叶模拟以及田间调查等方法研究稻纵卷叶螟的为害对水稻产量的影响.初步确定了该虫在综合防治区的经济损害水平为39条幼虫/百丛(剑叶期)和58条/百丛(分蘖期).并提出用害虫种群潜在密度确定卷叶螟经济阈值的方法.

Economic injury levels for the rice leaf—roller were determined based on the artificial leaf removal and on the number of larva per hill.It was reported that the EILs in tillering stage and in booting stage are 58 and 39 larvae per one hundred hill respectively.Economic threshold for this pest insect was estimated by measuring the increasement rate of population density.