近年来,葱蝇在黄河流域为害十分严重,葱、蒜被蛀食引起腐烂,使叶片枯黄、萎蔫,甚至死亡,一般被害株率达3O％—50％,严重的可达70％以上。韭菜被害造成缺苗断垄,严重时成片死亡。 一、发生规律 葱蝇在黄河流域一年发生3代。以滞育蛹在寄主根际及土中越冬。4月上、中旬,当日平均气温上升到8℃时开始羽化。第1代幼虫5月上、中旬盛发。第2代幼虫6月上旬末至中旬盛 In recent years, the onion fly in the Yellow River valley is very serious damage, onions, garlic decay caused by decay, so that leaves withered, wilting, and even death, the general rate of victim strains 3O% -50%, severe up to 70%. Chives killed lack of seedlings off the ridge, died in serious cases into pieces. First, the law occurs onion vermicelli in the Yellow River basin occurs three generations a year. With diapause pupa in the host rhizosphere and winter soil. April and mid-April, the average daily temperature rose to 8 ℃ began to emerge. The first generation of larvae in May on the mid-Sheng hair. The second generation larvae will reach mid-mid-early June