采用田间网捕和室内外饲养等方法研究了关中大蒜根蛆葱地种蝇（葱蝇）Ｄｅｌｉａａｎｔｉｇｕａ（Ｍｅｉｇｅｎ）和灰地种蝇（种蝇）Ｄ．ｐｌａｔｕｒａ（Ｍｅｉｇｅｎ）的生活史与发生规律。优势种葱蝇一年发生３代，以围蛹在土中越冬。世代历期：室内３６．５～５９．５ｄ，田间３２～７４ｄ．其年生活史可分为春季为害、越夏、秋季为害和越冬４个阶段，以春季第１代为害最重，是造成大蒜减产的主要原因。混合种群为害程度受５ｃｍ土壤温度及含水量、大蒜生育期和施肥的影响 The methods of field net catching and indoor and outdoor feeding were used to study Deliaantigua (Meigen) and Drosophila melanogaster (Drosophila melanogaster) D. platura (Meigen) life history and the law. The dominant species of onion fly occurs 3 generations a year, with the pupae overwintering in the soil. Generations: indoor 36.5 ~ 59.5d, field 32 ~ 74d. Its annual life history can be divided into spring damage, summer, autumn damage and winter 4 stage, the spring of the first generation of the most damaging, is the main reason for the garlic yield. The degree of mixed population damage is affected by 5 cm soil temperature and water content, garlic growth period and fertilization