250 MANUAL OF VEGETABLE-GARDEN INSECTS 



INIichigan the maggots were found to winter in the onions. 

 There are said to be three or four broods annually. 



References 



Insect Life, 7, pp. 352-354. 1895. 



Mich. Agr. Exp. Sta. Bull. 200, pp. 206-208. 1902. 



The Black Onion Fly 



Tritoxa flexa Wiedemann 



Occasionally associated with the insect last treated are found 

 the maggots of another fly. This species is native to America 

 and ranges through the northern states from New Jersey to 

 Minnesota. The fly is tg inch in length and dull black in color. 

 The wings are dull brown marked with three oblique whitish 

 bands. There are thought to be two broods annually. The 

 maggots sometimes continue to work in stored onions, reduc- 

 ing them to mere shells. 



No satisfactory control for this onion pest is known. 



Other Onion Insects 



Cabbage web worm : 16 

 Seed-corn maggot : 36 

 Yellow bear caterpillar : 357 

 Sugar-beet webworm : 97 

 Belted cucumber beetle : 115 

 Garden springtail : 139 

 Bean aphis : 76 

 Spotted cutworm : 262 

 Greasy cutworm : 265 

 Dark-sided cutworm : 268 

 Striped cutworm : 270 

 Clay-backed cutworm : 274 

 Black army-worm : 275 

 Variegated cutworm : 276 

 Army cutworm : 287 

 Beet army-worm : 294 

 Black blister-beetle : 307 

 Root-knot nematode : 338 



