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近年来,二化螟、稻飞虱和稻卷叶螟在水稻上发生量大,世代重叠,防不胜防,更为严重的是施药效果不理想,甚至越用药,害虫发生就越严重。调查发现,菊酯类、有机磷等类农药在稻田上的大量使用,杀死了大量的天敌,失去了天敌对害虫的控制作用。因此,只有合理施药并切实保护好水稻害虫的天敌,才能破解当前“越施药→虫害越严重→越施药”的恶性循环。
In recent years, the occurrence of rice stem borer, rice planthopper and rice leaf roller occurred in rice large, overlapping generations, very hard to guard against, even more serious application is not satisfactory, and even more medication, the more serious the occurrence of pests. The survey found that pyrethrins, organophosphate pesticides and other large-scale use of rice in the field, killing a large number of natural enemies, lost the control of natural enemies of pests. Therefore, only through reasonable application of pesticides and effective protection of natural enemies of rice pests can the current vicious circle of “more pesticides applied → more serious pests → more pesticides applied” can be solved.