INJURIOUS TO CARROT AND RELATED CROPS 199 



vised. After the flower-heads have opened, many of the 

 caterpillars may be destroyed by spraying or dusting with an 

 arsenical. 



References 



Riley, Insect Life, 1, pp. 94-98. 1888. 



Mich. Agr. Exp. Sta. 3rd Rept., pp. 112-115. 1890. 



Brittain and Gooderham, Can. Ent., 48, pp. 37-41. 1916. 



The Parsnip Leaf-Miner 



Acidia fratria Loew 



Sometimes the leaves of parsnip are disfigured by the mines 

 of a small whitish maggot. This insect is never very abundant 

 but is widely distributed throughout the whole United States 

 and is probably identical with the European celery fly, Acidia 

 heraclei Linn?eus. The greenish translucent maggots are found 

 in the leaves from May till July, where they produce blotch 

 mines. Several larvse occupy the same leaf and the mines 

 coalesce. The mines are most abundant on the lower leaves 

 or on plants grown in partial shade. When mature, the maggots 

 are a little over i inch in length. They transform to straw- 

 colored puparia usually within the mine, and the flies emerge 

 in about two weeks. The fly is about ^ inch in length. The 

 head, thorax and legs are pale yellow and the abdomen green. 

 The wings are beautifully marked with yellowish brown curved 

 bands. The number of generations annually has not been 

 definitely determined. 



Reference 



U. S. Bur. Ent. Bull. 82, pp. 9-13. 1909. 



The Parsley Stalk-Weevil 



Listronotus latiusculus Boheman 



This insect has been recorded as injuring parsley planted on 

 low land in Virginia and in coldframes in Connecticut. The 



