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蒜和葱在生长过程中时有出现枯黄、甚至死苗现象,既不是因受旱、又不是肥害和药害造成,原因何在?可从被害株的根部扒开泥土便看到有一种很小的虫,这种虫便是危害蒜、葱的根蛆,其幼虫专门是蛀入蒜根、蒜头和葱根及分蘖节内取食,一个鳞茎可有幼虫十多头、甚至有些多达几十头,受害的部位被蛀食成孔洞、引起腐烂,植株上部叶片出现枯黄、萎凋至死亡。这些小蛆是一种叫种蝇和葱蝇的小苍蝇把卵产于蒜、葱的根际土壤和粪肥中而繁殖成小蛆进行危害的。
Garlic and green onion appear in the growing process of the phenomenon of yellow or even dead seedlings, neither because of drought, but also not fat and injury caused by pesticides? From the root of the victim plant will be clinging to the soil will see a very Small insects, this insect is endangering garlic, onion root maggots, the larvae are specialized in eating into garlic, garlic and onion root and tillering Festival feeding, a bulb may have more than ten larvae, and even some up to Dozens of head, the affected parts were eaten into holes, causing decay, the upper leaves of plants appear yellow, withered to death. These little maggots, a small fly called a fly and an onion fly, are harmed by the eggs that grow in the rhizosphere soils of the onions and in the manure and multiply into small maggots.