灰地种蝇[Delia platura(Meigen)]群众称根蛆、土蛆,是蔬菜上的主要害虫。过去本地未见该虫在烤烟田为害。近年来,为防治青枯病、黑胫病、根黑腐病等土传病害,本县大力推广先进的漂浮式育苗方法,即用珍珠岩颗粒加生物肥做基质的育苗方法,对防治土传病害起了很大作用。但是,漂浮 Delia platura (Meigen)] The masses said the root maggots, soil maggots, are the major pests on vegetables. In the past, there was no insect found in flue-cured tobacco fields in the country. In recent years, in order to prevent soil-borne diseases such as bacterial wilt, black shank disease and root black rot, the county vigorously promotes advanced floating seedling raising methods, that is, seedling raising methods using perlite granules and biological fertilizer as matrix, Disease transmission plays a big role. However, floating