播种时用6%可湿性六六六粉每亩3斤撒施畦面,苗床期两片真叶开始,连续用乐果及二二三、六六六混合液治蚜4次,与加强肥水管理,效果达84.7%。

• By surface dressing of the seed-bedwith 6%25 of wettable benzene hexachloride(BHC)followed by spraying the seed-lings with Rogor and a mixture of DDT and BHC 4 times,beginning from the2-leaf stage,together with three applications of liquid fertilizer reduced the dis-ease by 84%25 over the plot which received only one spray of DDT+BHC and twoapplications of liquid fertilizer.