论文部分内容阅读
我区菜田从1961年起广泛使用乐果药剂防治菜蚜,效果良好,很受群众欢迎,但是,近两年来,一些菜农反映乐果治蚜不灵了,有的提高使用浓度,增加防治次数,但结果仍然不够理想。为澄清这一问题,我们曾在73年、74年两年到天木、柳滩、王庄、宜兴埠等大队了解访问。群众反映,在地块、作物、品种、栽培管理及打药技术与以往相同情况下,过去乐果治蚜效果很好,可是近二年来效果显著减退。这一情况是否由菜蚜对乐
Vegetable zone in our district since 1961, the widespread use of dimethoate prevention and control aphids, the effect is good, very popular with the masses, but in the past two years, some farmers reflect the dimethoate treatment is not working, and some increase the use of concentration, increase control However, the result is still not satisfactory. To clarify this issue, we visited the brigades of Tianmu, Liutan, Wangzhuang and Yixingbu in 1973 and 1974 respectively. The masses said that in the past, landraces used to cure aphids very well in the past under the same conditions as the previous land plots, crops, varieties, cultivation and management, and drug-fighting techniques. However, the effect has been significantly diminished in the past two years. Whether this situation is aphid-to-music