我们于1981年开始在氏沙东郊进行稻纵卷叶螟为害穗期水稻的种群密度与产量损失及经济阈值的研究。三年的摸索,对试验及分析方法产生一些想法。一、有关试验方法方面我们试用过田间小区,网室小池,盆栽笼罩方法,采用了接虫与剪叶,受害穗分级考种及小区产量实测等方法。感到从同一田块不设空行过道的田间小区比笼罩或网室处理更真实;建立幼虫密度——累积为害量——稻谷减收量的相关关系比虫量——减产的直接关系好;实测产量比考种推算好;使用叶面积损害指数比卷叶百分率好。1.关于虫量维持单位水稻上一定虫量直至化蛹,例如接同期二龄虫,中途死亡则补足是常用的基本方法。不过实际上,卷叶螟着卵稻株后,种群受气候、天敌、水稻等影响,密度 We started in 1981 in the eastern suburbs of sand in the rice thrip leaf borer rice heading population density and yield loss and economic threshold. Three years of exploration, the test and analysis methods have some ideas. First, the method of testing we have tried the field plot, net cell pool, potting methods, using the pick and cut leaves, ear damage grading test and cell yield measurement and other methods. Feeling that the field plots from the same field without emptying aisles were more real than the shrouded or cymbal treatments; the establishment of larval density-cumulation damage-rice correlation was more direct than worm mass-yield reduction; Measured yield better than the test species; the use of leaf area damage index is better than the percentage of leaf curl. 1. On the amount of insects to maintain a certain amount of rice on the pupal until the pupation, for example, the second instar of the same period, the middle of the death is to make up is a common basic method. However, in fact, the rolling leaf borer rice plant, the population affected by climate, natural enemies, rice and other effects, the density