看本质 抓主流 在治螟工作中首先遇到的问题是主攻对象,究竟这一仗以三化螟为主?还是二化螟为主?正常情况下,可以根据上一代的虫口数量作为主要依据;但是,有时上一代占比例大的可以不治,占比例小的反而要治。1963年我们在防治单季晚稻二代螟害时曾碰到这个问题。从第一代数量来看,二化螟占三种 See the essence of the mainstream caught in the work of the management of borer first encounter is the subject of the problem, after all, this battle to borer-based? Or is the second to stem borer? Under normal circumstances, the population can be based on the previous generation as the main basis However, in some cases, the previous generation can not rule a large proportion of the population, but the proportion of small ones should be controlled instead. In 1963, we encountered this problem when we were dealing with the single-season late rice second-generation pest damage. From the first generation of quantitative point of view, borer accounted for three