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所谓有效低浓度,一般是指在48小时内,防治病虫害效果达85—95%,使农药的不良影响降低到最低限度时的农药浓度或用量。采用农药有效低浓度,可在防治病虫害的同时,尽可能减轻农药的不良影响。一、采用有效低浓度施药的效果据仁舍公社东升大队试验,采用50%甲胺磷乳剂有效低浓度防治黑尾叶蝉等效果良好。详见表1。表1 甲胺磷防治黑尾叶蝉、稻纵卷叶螟的效果
The so-called effective low concentration, generally refers to within 48 hours, pest control effect of 85-95%, so that the adverse effects of pesticides to a minimum when the pesticide concentration or dosage. The use of pesticides at low concentrations can be pest control in the same time, as far as possible to reduce the adverse effects of pesticides. First, the use of effective low concentrations of pesticide application results according to Ren she commune Dongsheng Brigade test, the use of 50% methamidophos emulsion effective low concentration of prevention and control of black tail leafhopper and other good results. See Table 1 for details. Table 1 methamidophos prevention and control of leafhopper, rice leaf roller effect