论文部分内容阅读
按生产上常规用量，每亩喷施２０％灭多威乳油６０毫升防治二代棉铃虫，施药后７天在棉叶上及１４天在土壤中其降解率分别为９８．８１％及８８．０９％；半衰期分别的１．５６天及４．９８天。防治二、三、四代棉铃虫，按有效剂量施药６次，有效成分７２克／亩，棉籽和土壤中的最大残留量分别为０．０２３及０．０８４微克／克；再加大５０％用量，有效成分１０８克／亩，最大残留量仅为０．０３４及０．２１４微克／克。结果表明，灭多威在棉叶上及土壤中降解较迅速，常规用量下，对棉籽及土壤污染较轻。
According to the production of conventional dosage, sprayed 20% methomyl EC 60 ml second-generation cotton bollworm, 7 days after spraying on cotton leaf and 14 days in the soil degradation rate was 98.81% and 88 .09%; 1.56 days and 4.98 days respectively. Prevention and control of the second, third and fourth generations of cotton bollworm, the effective dose of 6 times, the active ingredient of 72 g / mu, cottonseed and soil maximum residue were 0.023 and 0.084 micrograms / g; % Dosage, the active ingredient 108 grams / mu, the maximum residue is only 0.034 and 0.214 micrograms / gram. The results showed that methomyl degraded rapidly on cotton leaves and soil, and polluted cottonseed and soil under normal dosage.