乐果是防治蔬菜蚜虫的理想药剂。1961年南京市化工研究所和上海农药厂合成了一些样品,做成50％乳剂,经田间试验确有良好的防治效果。但蚜虫繁殖甚速,为害期长,必需连续防治方能收效。有些国家规定乐果在蔬菜中的残留量为2ppm(Chilwell等,1960)。目前我国尚缺乏使用经验。为此,除在大田进行喷药试验外,又考查在南京秋季气候条件下,乐果在蔬菜上的残效期及内吸残留量以供生产需要。 测定有机磷农药在农作物上的残留量,通常用酶的方法。但某些对胆碱酯酶抑制能力较低,以及不易通过 Dimethoate is the ideal agent to control vegetable aphids. 1961 Nanjing Chemical Industry Institute and the Shanghai Pesticide Factory synthetic samples, made of 50% emulsion, the field test does have good control effect. However, the aphids reproduce very quickly, the damage period is long, continuous prevention and treatment can only be effective. Some countries require dimethoate residues in vegetables at 2ppm (Chilwell et al., 1960). At present, China still lacks experience in using it. To this end, in addition to spray test in the field, but also to examine the Nanjing autumn climatic conditions, the dimethoate residues in vegetables and residual capacity for production needs. Determination of organophosphorus pesticide residues in crops, usually by enzyme method. But some of the lower inhibition of cholinesterase, as well as difficult to pass