韭菜棚室和露地均可发生韭菜根蛆、如除治不好可造成严重减产。韭蛆幼虫钻食韭菜地下部分，其表现症状：地上叶片瘦弱、枯黄、萎蔫断叶，幼虫常聚集在根部鳞茎里或钻蛀假茎中引起腐烂，严重时可造成整畦毁种，损失很大。一、韭蛆的发生规律韭蛆一般以幼虫在韭根周围3～4厘米深 Leeks sheds and open leek root maggots can occur, such as bad governance can cause serious cuts. Leek maggot larvae drill underground parts of the leek, the performance of symptoms: the leaves on the ground thin, yellow, wilted leaves, the larvae often gather in the root bulbs or stem borers cause decay, in severe cases can cause the whole breed destroyed, the loss is very Big. First, the occurrence of leek maggot leek maggot larvae generally in general around 3 to 4 cm deep