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1965年以前,本省防治松毛虫所用农药主要为666和滴滴涕,其中1961—1964年666粉剂用量占总用药量85%以上。这两种药剂在使用过程中有不少缺点或问题:1.长期连续使用一种药剂,杀虫率会降低,据1964年北云台、东进和东善桥等林场反映:6%666粉剂每亩用薪量7.5斤防治4—5龄幼虫平均杀虫率只有46—63%,2%666粉剂杀虫率低到20—30%,用
Prior to 1965, the main pesticides used in the prevention and control of pine caterpillars in the province were 666 and DDT, of which 666 used 1966 to 1964 accounted for more than 85% of the total dosage. There are many shortcomings or problems in using these two kinds of medicaments: 1. Long-term continuous use of one kind of medicament will reduce the insecticidal rate. According to the records of Beiyuntai, Dongjin and Dongshanqiao in 1964, such as: 6% 666 Powder per acre with a salary of 7.5 kg Prevention of 4-5 instar larvae average insecticide rate of only 46-63%, 2% 666 powder insecticide rate as low as 20-30% with