用滴滴涕防治粘虫用量大,成本高,666效果又差。我們用0.5％666粉和5％滴滴涕粉,按1:1、1:2和1:3混合,每亩用3.5斤进行防治示范,经群众实地检查参观,都异口同声說效果很好。由試驗和大田防治检查中証明5％滴滴涕粉剂的殘留药效約10天左右,1:1混合粉剂約5—6天,1:2混合粉剂3—4天,而1:3混合 With DDT large amount of control armyworms, high cost, 666 effect is poor. We use 0.5% 666 powder and 5% DDT powder, mixed by 1: 1, 1: 2 and 1: 3, 3.5 kg per acre for prevention and treatment demonstration, the masses of field visits, all say the same effect. The residual drug efficacy of 5% DDT powder was demonstrated by tests and field control examinations for about 10 days, 1: 1 mixed powder for about 5-6 days, 1: 2 mixed powder for 3-4 days, and 1: 3 mixed