心叶期防治玉米螟一般多采用666液剂灌心叶的方法,一、二年来部分地区开始试用毒土防治,效果很好。为了进一步明确666和滴滴涕毒土防治玉米螟的效果,着重研究防治适期及施药次数,我们于1959年4—6月在山东聊城上关公社春玉米地进行试验。拌毒土所用的泥土取自当地农田(土壤待分析),拌药前先过筛,土粒大小在40-60筛孔之间。666毒 Centered leaf stage corn borer prevention and control more commonly used 666 liquid filling heart method, one or two years in some areas began to try toxic soil control, the effect is very good. In order to further clarify the effect of 666 and DDT to prevent and control corn borer, we focused on the appropriate period of prevention and treatment and the number of pesticides application. We conducted the experiment in spring maize land in Shangguan Commune, Liaocheng, Shandong Province in April-June 1959. The soil used for mixing toxic soil is taken from the local farmland (soil to be analyzed), sieved before mixing, soil size between 40-60 mesh. 666 poison