Effect of chlorpyrifos and methyl chlorpyrifos on controlling rice ieaffolder(Cnaphalocrocis medinalis Guenee)in field

摘要

Rice leaffolder (Cnaphalocrocis medinalis Guenee)has become a serious pest on rice in Jiangsu Province.The insect appeared in Jul and remained until Sep. A field trial with 5 treatments and three replications was laid out in a randomized complete block design in a farm field in Jiangsu,China in 1993. The hybrid rice tested was transplanted into 2×25m plots. Using a knapsack sprayer, we