major heading meaning in English

主标目
主辞标目

There are several insect pests and diseases breaking out simultaneously in xiangshui county in 1998 while rice is in the ear . for integrated controlling these pests effectively as well as using less manpower and cost . we took such measures as taking account of all the major heading pests , selecting the appropriate insecticides and fungicides at the same time only once , which reaches the goal of overall - control pests . all of these measures are well received by local peasants
响水县98年水稻穗期多种虫害，病害并发、重发应采取的综合控制对策是在病虫害集中发生和防治适期内采取适当调佳用药时间，瞻前顾后，一药多用，多药合用，病虫兼治，主次突出，达到全面控制病虫害的目标，省工节本，深受群众的欢迎。