CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS 277 



The Barred-winged Onion Maggot {Chaitopsis oenea Wied.) is also 

 injurious to onions (Michigan). 



Control. — Apply poisoned bait spray composed of sodium arsenite 

 and molasses to kill adults; apply hellebore, pyrethrum and carbolic 

 wash. 



Seed Com Maggot (PhorbiafuscicepsZett.). — (Consult Bull. 12, Ent. 

 Br. Dep. Agric. Can.). Injurious frequently to beans, peas and corn. 



Adult. — Smaller than Onion Maggot Fly, }-^ inch long; bands on 

 back of thorax indistinct, those on abdomen distinct; inner side of pos- 

 terior tibiae of male with a row of short bristly hairs. Body of female 

 pointed, eyes widely separate. June-July. 



Eggs. — ^Laid on or about the seed in the soil, or on the seedling. 



Larva. — Smaller than Cabbage Root Maggot or Onion Maggot, 3^^ 

 inch long; whitish, cylindrical, footless, blunt at caudal end and pointed 

 at the head. Caudal tubercles simple, rather close together with a 

 trace of additional tubercles. Feeds mostly on the seed. 



Pupa. — Puparium }i inch long, light brown to dark reddish-brown; 

 duration 12 days. 



Number of generations not yet known. Injury seems most severe 

 when a wet period follows immediately after planting the seed. 



Control. — Difl&cult. Use mineral fertilizers; carbolic acid emulsion. 



Raspbeny Cane Maggot (Phorbia rubivora Coquillet). Adult. — A 

 grayish-black fly, smaller than the house-fly. April. 



Eggs. — White, elongate, 3^^ 5 inch long, laid in the axil of young 

 leaves at the tip of shoot. Hatch in a few days. 



Larva. — Maggot bores into the pith of the shoot, and tunnels 

 downward, making a tortuous path. About halfway down it girdles 

 the wood beneath the bark. It continues burrowing downward and 

 becomes full grown in June. Wilting occurs in May. 



Pupa. — Formed at lower end of burrow in June and July. 



Control. — Cut off and burn the wilting canes as soon as observed. 



Beet Leaf Miner {Pegomyia vicina Lintner). — It is sometimes de- 

 structive to beets in late fall. Whitish blotches are formed on the 

 leaves. There are several generations each year, and the winter is 

 passed in the pupal condition under fallen leaves or in the soil. The 

 eggs are placed on the lower side of the leaves, and the maggots mine 

 in the leaves; life-cycle about a month. 



Control. — Pick and burn infested leaves where practicable; use 



