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紫云英是湖南双季稻田主要绿肥植物,一般在9月下旬播种,至次年早稻移栽前犁翻,历时6个多月。以往只注意紫云英田是一些水稻害虫如黑尾叶蝉、灰稻虱和螟虫等的越冬场所;同时从增产绿肥出发,只注意一些绿肥害虫如蓟马、潜叶蝇和蚜虫等的为害。从未注意绿肥田中潜在的天敌昆虫的存在与作用。因而强调在紫云英开花期喷洒农
Astragalus is the main green manure in Hunan double cropping paddy field, generally sowing in late September, to the next year before plowing early transplanting plow, lasted more than 6 months. In the past, only the attention of Ziyunyingtian is a wintering place for some rice pests such as the black-tailed leafhopper, the gray flies and the stem borers. At the same time, starting from increasing the green manure, it only pays attention to some green manure pests such as thrips, leafminers and aphids. Never mind the existence and role of potential natural enemy insects in green manure field. Thus emphasizing the spraying of farmers in the flowering period