溴氰菊酯和甲胺磷引起稻飞虱再猖獗问题的研究

室内测定和田间试验的结果表明，溴氰菊酯引起稻飞虱再猖獗的现象非常明显，其原因首先是稻飞虱对溴氰菊酯具有极高的自然耐药力，连续施药以后，耐药力还会进一步提高；其次是药剂会使飞虱的产卵量增多，并杀伤天敌。这种再猖獗在用药量偏低时更为明显。甲胺磷在常用剂量下，对飞虱的再猖獗不明显。

Studies on the resurgent question of planthoppers iuduced by deltamethrin and methamidophos

This paper dealing with some results from laboratory and field tests indicated that the resurgence of Nilaparvata lugens and Sogatella furcifera populations induced by deltamethrin was remarkable. There appear to be two reasons for the occurrence. First, the natural tolerance of Nilaparvata lugens and Sogatella furcifera to deltamethrin was extremly high. After deltamethrin was sparged continuously in the field, the resistance of hoppers could be increased further. Second, deltamethrin stimulated hoppers to oviposite and killed the natural enemies. The resurgence was more obvious when the deltamethrin was applied at low dosage, but it was not evident that the resurgence effect of hoppers can be observed as treated with methamidophos at its regular dosage.