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根蛆是大蒜上的重要害虫,是常发、重发虫害之一。过去我市大蒜栽培面积小,发生也较轻。近年随着大蒜栽植面积的增加,发生逐年加重,尤其近两年更为严重。据统计,全市大蒜栽培区全面发生,蒜头虫蚀率一般为15～20%,重者达30%以上,减产在10%以上,严重影响了大蒜的产量、品质。大蒜根蛆主要有葱蝇、灰地种蝇两种,以葱蝇为主。两种根蛆均一年发生两代,以蛹越冬,为害盛期在秋季和翌年4月上旬至5月上、中旬。
The root maggot is an important pest on garlic and is one of the most common and repeated pests. In the past, the city of garlic cultivation area is small, happen to be lighter. In recent years, with the increase of the planting area of garlic, the occurrence has been increasing year by year, especially in the past two years. According to statistics, the garlic cultivation area in the city takes place in a comprehensive way. The worm eradication rate of garlic is generally 15-20%, and the weight is more than 30%. The yield reduction is over 10%, seriously affecting the yield and quality of garlic. Garlic root maggots are mainly Onion fly, two kinds of ash to fly, mainly onion fly. Two kinds of root maggots occur in two generations a year, with the pupae overwintering, damaging the peak in autumn and early April the following year to May, mid.