论文部分内容阅读
1962年在北京夏玉米上用顆粒剂防治玉米钻心虫的結果表明:心叶末期施5％DDT顆粒剂,防治一次,每株2克,在一般年份,从产量上来看是很有利的。同时对药剂残效,幼虫在玉米不同生育期植株上的分布,以及顆粒剂在心叶期施药至抽雄后在植株上的分布测定,并結合顆粒剂小区防治試驗。分析結果说明:心叶末期施药,影响药效的主要原因,不是5％DDT残效的問題,而是抽雄后药剂在植株上部分布較少,尤其是包在雄穗节外的第一叶腋没有药,而此时期,幼虫在植株上部分布較多,同时DDT速效也不如666。
The results of the control of corn borer by granules on summer maize in Beijing in 1962 showed that the application of 5% DDT granules at the end of the heart leaf for one control and 2 grams per plant in the general year was favorable from the standpoint of yield. At the same time, the distribution of pesticide residues, the distribution of larvae on the plants at different growth stages of corn, and the distribution of the granules on the plants after the application of the granules to the tasseling stage at the leaf stage were analyzed. The results showed that the main cause of drug effect was not the problem of 5% DDT residue but the less agent on the upper part of the plant after tasseling, especially in the first leaf axils not wrapped in the tassel node In this period, the larvae spread more on the upper part of the plant, and DDT was not as effective as 666 at the same time.