柑桔大实蝇 Tetradacus citri(Chen.)和蜜柑大宴蝇 T.tsumeonis(Miyake)是为害桔、橙、柚、香橼等果实的两大检疫性害虫。由于二者外部形态、为害征状、生物学特性等都很相似,在混合发生地区,因其成虫某些种间特征个体间变化较大,不易区别,给初识者在鉴定时带来困难。1981年起,笔者先后从贵州南部12个县、市采集了两千多斤被大实蝇蛀害的蛆果,饲育出大量成虫并作了详细观察。现将这两 Tetradacus citri (Chen.) And T. tsumeonis (Miyake) are the two quarantine pests responsible for fruits such as orange, orange, grapefruit and citron. Because of their appearance, symptoms and biological characteristics, they are very similar. In mixed areas, because of the large variation between some interspecific characteristics of adults, . Since 1981, I have collected more than 2000 kilograms of maggots from the 12 counties and cities in the south of Guizhou for decaying Dianthus, breeding a large number of adults and making detailed observations. Now these two