536 



INJURIOUS AND BENEFICIAL INSECTS OP CALIFORNIA. 



THE WESTERN RADISH MAGGOT 2 " 



Phorbio planipalpis (Stein) 

 [Pegomyia planipalpis (Stein)] 

 (Chortophila planipalpis Stein) 



(Figs. 33 4-339) 



Description.— The flies are rather robust, dark blue or black and 

 covered with many large black hairs, which give them the appearance 

 of the tachina flies. The length averages f inch from the face to the 

 tip of the wings. The females have two continuous and two broken 



Fig. ;!:!!. — Radishes showing the work of the Western 

 radish maggot, Phorbia planipalpis (Stein). Natural size. 

 (Original) 



longitudinal lines on the dorsum of the prothorax. In the males the 

 median black stripe on the dorsum of the abdomen is continuous. The 

 eggs are long and slender, slightly curved, pure white with very fine 

 longitudinal depressions and fa inch long. The maggots vary from 

 white to yellow and when full grown are from j- to § inch long. They 

 are distinctly segmented, truncate at one end and pointed at the other. 



-'-The cabbage maggot, Phorbia brassicw (Bouche) does not occur in California 



"rding to the recent findings of Prof. J. M. Aldrich. who has kindly identified all of 



the material for me. All previous mentions of this species probably refer to the 

 western radish maggot. 



