近年来,京郊耕作改制后,套种玉米面积迅速扩大,约占整个玉米种植面积的80%以上,二代玉米螟的幼虫孵化期,常与套种玉米的喇叭口期相吻合,往往造成对套种玉米的严重危害。为解决套种玉米的二代螟害,曾进行了心叶末期撒颗粒剂和穗期药剂防治的试验,虽有一定防治效果,但因颗粒剂来源问题和工效低等原因,未能大规模推广。1974年开始试 In recent years, after the reform in the suburbs of Beijing, the area of ​​intercropping maize has rapidly expanded, accounting for more than 80% of the total area planted with corn. The larvae hatching period of the second generation of maize borers often coincides with the bell stage of intercropping corn, Serious damage to corn. In order to solve the second generation of rice intercropping maize damage, had carried out at the end of the heart of leaf particles and sprinkling agent prevention and control of the test, although a certain control effect, but due to sources of granules and low efficiency and other reasons, failed to promote large-scale . 1974 test