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近年来,由于二化螟日趋严重,用药量不断增大,特别是杂交稻用药多成本高,带来一系列问题.为寻求解决途径,1982年以杂交稻汕优3号为主要对象,采用田间笼罩接卵方法,研究水稻不同生育期二化螟的卵量与为害和不同为害程度与产量损失的关系,探讨防治指标,以供商榷.卵块密度对不同生育期杂交稻的为害与损失(一)分蘖期(播种后第31天接虫)有卵量就有为害,卵量愈大为害愈重.卵量与枯心相关值为0.9489,相关极显著.每亩170个卵块枯心率10.83%,2660个卵块枯心率27.53%.但有为害并不等于有损失,一定量的枯心率对产量没有影响,有的反而增产.如
In recent years, due to the increasingly serious stem borer, the increasing dosage, especially the high cost of hybrid rice drug use, resulting in a series of problems.In order to find a solution, in 1982 to hybrid rice Shanyou 3 as the main object, using The method of covering eggs in field was used to study the relationship between egg weight, damage and different damage degree and yield loss of rice stem borer (Chilo suppressalis (Walker)) at different growth stages, and to discuss the control index for discussion.Dissociation and damage of egg weight to hybrid rice at different growth stages (1) At the tillering stage (on the 31st day after seeding), the number of eggs is harmful, and the larger the amount of eggs, the harder the more weight.The correlation between the amount of eggs and the amount of dead is 0.9489, and the correlation is extremely significant. The dry weight of 170 eggs per mu is 10.83 %, 2660 eggs, 27.53% withered heart rate, but there is harm does not mean that there is a loss, a certain amount of dry heart rate has no effect on the yield, while some increase.