Idenfficafon of Delia Spp. Flies

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Iden%ficaon of Delia spp. Flies onion maggot = D. anqua bean seed maggot = D. florilega seed corn maggot = D. platura cabbage maggot = D. radicum (ex. brassicae) males vs. females Male with clasper-like appendages Female with terminal slit or opening bent backward from %p along underside of %p of abdomen, %p of at end of abdomen, some%mes with flexible ovipositor protruding, %p abdomen may appear bulbous generally conical Delia anqua– onion maggot larger-sized (larger or similar to D. radicum) , but overall much lighter colored (similar to D. platura), host: found only on onions Best character is larger size (almost twice as large as platura/ florilega). Compared to platura, Top of head top of head between eyes more depressed depressed, “face” more protruding in front Delia platura Top of head flaer Front of head more protruding (wider gap Front of head between eye and Delia an(qua less protruding frontal ridge) (narrower gap between eye and frontal ridge) Delia florilega – bean seed maggot Delia platura – seed corn maggot Both species extremely similar in appearance and biology, but both generally smaller in size than D. anqua or D. radicum , found on many hosts Separang males: middle leg middle leg 1st tarsal segment 1st tarsal segment with long bristles, 2x with short bristles, as long as tarsal about as long as width tarsal width D. florilega - male D. platura - male Delia florilega – bean seed maggot Delia platura – seed corn maggot Separang females: Middle %bia with 4 or fewer Middle %bia with 5 or more bristles around middle bristles around middle (don’t count those at apex) (don’t count those at apex) D. florilega - female D. platura - female Delia radicum – cabbage maggot Slightly larger-sized than platura/florilega, darker-colored, very bristly appearing, hosts: only on plants in cabbage/mustard family Females may be lighter colored. No good characters for female except palps are long and thin, legs brownish Male – hind femur with long, dis%nc%ve bristles at base (short or absent on other species) .

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