INSECTS INJURIOUS TO CELKRV, PARSNU'S, ETC. I77 



pearaiicc in 1901 in New York in celery fields. In attack on 

 celery the leaves of young plants early in spring turn reddish, 

 and the roots are blotched with rusty patches, particularly 

 toward their tips. Roots of carrot when stored for winter, al- 

 though not manifesting any degree of injury on the outer 

 surface, are at times perforated in all directions by dirty brown- 



Fig. 115— Carrot rust fly. $ . Male fly; ? , female fly; a, antenna of male; b, full- 

 grown larva, lateral view; c, spiracles of same, d, anal extremity; e, puparium; /. young 

 larva; g anal segment from side. Flies, young and mature larva, and puparium, eight 

 times natural size; other portions more enlarged. (Author's illustration, U. S- Dept. 

 Agr.) 



ish burrows, from which these whitish yellow maggots may be 

 found projecting. When celery is infested the larvae seem to 

 begin eating into the thick part of the root when the plant is 

 about half grown, stunting it so as to make it worthless for 

 market. 



This species is quite minute, the parent Hy measuring only 

 about one-sixth of an inch in length, with a wing expanse of 

 a little more than three-tenths of an inch. The body is dark 

 green and is rather sparsely clothed with yellow hairs. The 

 head and legs are pale yellow, and the eyes black. The two 

 sexes are shown at $ and $, figure 115. According to Curtis, 

 when the imago issues from the puparium an oval lid on this 

 portion lifts up, permitting the fly to crawl out. The posteiior 

 extremity ends in two minute dark tubercles. 



The carrot rust fly is a pest in Europe, whence it has been 

 introduced in this country. It is a northern species and is 



