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七十年代中、后期以来,湖南各地的二化螟种群数量先后大量回升,除与杂交水稻和迟熟早稻的普及推广有关外,与施肥水平的提高,特别是氮素化肥施用量的增加亦有密切关系。笔者于1983年11月晚稻收割后,在湖南省水稻研究所的“杂交晚稻规范化栽培”试验田内,进行了尿素不同施用量与二化螟的螟害率、虫口密度以及幼虫的体重、体长和越冬后幼虫羽化的雌蛾抱卵量等关系进行了考察。
Since the mid and late 1970s, the population of stem borer (STI) populations in various parts of Hunan Province has picked up a lot in succession. Except for popularization and popularization of hybrid rice and early maturing early rice, the increase of fertilization level, especially the increase of nitrogenous fertilizer application rate There is a close relationship. After the late rice was harvested in November 1983 in the experimental field of “normalized cultivation of late hybrid rice” of Rice Research Institute of Hunan Province, the author studied the effects of different application rates of urea on stem borer rate, population density and body weight of larvae, body length And overwintering larvae fecundity females ovulation and other relations were investigated.