韭菜是冬春保护地栽培的主要品种之一,但每年都有不少棚室因韭蛆为害而严重减产。韭蛆又名韭菜根蛆。据调查,河北省为害韭菜的根蛆主要有迟眼蕈蚊和陆氏迟眼蕈蚊两种,以前者为主,同时还有葱蝇幼虫混生。韭蛆幼虫钻食韭菜地下部分,轻者地上叶片瘦弱、枯黄、萎蔫断叶,重者成墩死亡。幼虫常集在鳞茎(俗称“葫芦”)里或钻炷假茎中,引起腐烂,可造成整畦毁种。连茬地块蛆害严重时则可毁棚,损失极大。 一、发生规律。韭蛆一般以幼虫在韭根周围3—4厘米深的土中或鳞茎内休眠过冬,翌年大棚韭菜1月末至2月初扣棚后,3月当韭菜萌发时,幼虫开始活动取食,3月下旬至5月中旬大部分越冬幼虫移至地表1—2厘米处化蛹,4月至5月中旬羽化为成虫,并交尾产卵。一般4—5月是扣棚和露地韭菜被 Leek is one of the main varieties cultivated in winter and spring protected areas, but every year many of them have severe yield loss due to leek maggot damage. Leek maggot, also known as leek root maggots. According to the survey, the root maggots that cause damage to leeks in Hebei Province are mainly two kinds of larvae and two larvae of Muscidae, the former mainly, while there are mixed Alternaria larvae. Leek maggot larvae eat underground parts of leeks, the light leaves on the ground thin, yellow, wilted leaves, severe death into pier. The larvae often gather in the bulbs (commonly known as “gourds”) or in the fake stems, causing decay, which can cause ruin. Stubble block maggot damage can be destroyed when the block shed, great loss. First, the law occurs. Leek maggot larvae generally 3-4 cm in the soil around the roots or bulb dormancy winter, the following year the greenhouse leeks from late January to early February after shedding, when the leek germination in March, the beginning of activity feeding, March Most of the overwintering larvae migrate to the surface at 1-2 cm from the end of May to mid-May to pupae. From April to mid-May, most of the overwintering larvae become adult and oviposit. General 4-5 month is shed and exposed leeks