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萝卜地种蝇[Delia floralis(Fallen)]又名白菜蝇、菜根蝇,是甘肃省大白菜、冬萝卜、冬油菜等十字花科作物上的主要地下害虫。分布全省,以西秦岭一线以北、海拔1700米以下的农业区密度大,危害重。1982年调查,酒泉、张掖、武威、兰州、天水等地,大白菜、冬萝卜受害率高达30—70%。1987年在西峰调查冬油菜,受害率达53—100%,越冬死苗率达19.7—93.1%,翻耕改种面积达油菜播种面积30%以上。被害后的冬萝卜不能食用,
Delia floralis (Fallen), also known as cabbage fly and root-knot flies, is the major underground pest on cruciferous crops such as Chinese cabbage, winter radish and winter rapeseed in Gansu Province. The distribution of the province, west of Qinling Mountains to the north, 1700 meters above sea level agricultural area density, serious harm. 1982 survey, Jiuquan, Zhangye, Wuwei, Lanzhou, Tianshui and other places, cabbage, winter radish victims as high as 30-70%. In 1987 the Xifeng winter rape survey, the victimization rate of 53-100%, overwintering dead seedlings rate of 19.7-93.1%, tillage area of up to rapeseed sown area of more than 30%. After the victim’s winter radish can not eat,