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经1984—1985两年大区试验,用0.04%除虫精粉防治菜青虫效果良好。据唐山新区刘庄子试验,1984年5月22日在0.5亩早甘蓝田调查,虫口密度三点平均百株活虫86.7头,用药后24小时检查,杀虫率94.7—97.4%,平均96.0%。1985年5月17日在1亩早甘蓝田试验,三点平均百株活虫60头,用药24小时检查,杀虫率94.3—97.6%,平均96.4%。每亩用药量2—2.5公斤,每亩成本0.7—0.8元。0.04%除虫精粉是锦州市农科
After 1984-1985 large area test, with 0.04% demetonase powder Pieces of Pieris good control. According to the test of Liuzhuangzi in Tangshan New District, on May 22, 1984, in 0.5 mu of early sweetpotato field investigation, the average population of 86 live insects at three-point population density was 86.7. After 24 hours of treatment, the insecticidal rate was 94.7-97.4% with an average of 96.0% . May 17, 1985 in 1 acres of early cabbage field test, average of three live 60 live insects, medication 24 hours inspection, insecticidal rate 94.3-97.6%, an average of 96.4%. 2-2.5 kg per mu dosage, cost per acre 0.7-0.8 yuan. 0.04% Cordyceps powder is Jinzhou City Department of Agriculture