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灌溉的同时进行生物防治美国农业研究中心的昆虫学家筛选出一种病毒，可混在灌溉水中使用，以消灭使玉米减产１５％的玉米铃和棉铃虫属（Ｈｅｌｉｃｏｖｅｒｐａ－Ｈｅｌｉｏｔｈｉｓ）害虫。据田间试验，可减少玉米铃幼虫２５～１００％。以成穗时使用１次，吐丝后３次效...
Biological Control While Irrigating Entomologists at the American Agricultural Research Institute (IRC) have screened a virus that can be mixed in irrigation water to kill corn and Helicoverpa-Heliothis pests that cut corn by 15%. According to field trials, corn germ can reduce 25 ~ 100%. Spike to use 1 time, 3 times after silking ...