370 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



The Carrot Rust-fly * 



The Carrot Rust-fly is a European species, being a serious 

 pest of carrots in England and Germany, which has been known 

 in Canada since 1885 and appeared in New York in 1901 and 

 since then in New Hampshire. The larva or maggot which does 

 the injury very much resembles the cheese maggot or skipper in 

 general appearance, is a rather dark brown, and a little less than 

 one-third inch long. The parent fly is about one-sixth inch 

 long with a wing expanse of three-tenths inch, and is a dark 



FIG. 312. The carrot rust-fly (Psila roses Fab.): "b, male fly; o , female flys, 

 side view; a, antenna of male; 6, full-grown larva from side; c, spiracle 

 of same; a, anal extremity from the end; e, puparium; /, young larva; 

 g, anal segment from the side eight times natural size except a, c, d, g, 

 more enlarged. (After Chittenden, U. S. Dept. Agr.) 



blackish-green color, sparsely clothed with yellow hairs, and with 

 pale yellow head and legs, except the eyes, which are black. 



"Attack on carrots is not difficult of recognition. The leaves 

 of the young plants early in the spring turn reddish, and the 

 roots are found to be blotched with rusty patches, particularly 

 toward their tips. The roots when stored for winter, although 

 not always manifesting any degree of injury on the outer surface, 

 may at times be perforated in all directions by dirty brownish 

 burrows, from which the whitish or yellowish larvse may be 

 found sometimes projecting." Celery is also attacked, the larvae 



* Psila rosv Fab. Family Psilidw. See Chittenden, Bulletin 33, n. s. 

 Division .of Entomology, U. S. Dept. Agr., p. 26. 



