346 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



" Injury appears to be most frequent in late fall, but 

 may be due to earlier generations in midsummer. " In many 

 cases infestation can be traced directly to the insect having 

 bred in lambsquarters and similar weeds, which if not destroyed 

 by ordinary methods of cultivation mature and die during 

 October." 



Control. Where this pest occurs in small gardens it may be 

 controlled by picking and destroying the infested leaves, and 



FIG. 248. The beet leaf-miner (Pegomyia vicina Lintn.): , fly; b, head of; 

 male fly; c, head of female; d, surface of egg highly magnified; e, egg 

 /, maggot; g, head of same; j, anal segment; k, anal spiracles all 

 enlarged. (After Howard, U. S. Dept. Agr.) 



even in larger fields such a practice might prevent its increase 

 and consequent injury. Those insecticides which have been 

 tried as remedies seem to have had no effect. Deep plowing 

 and thorough harrowing of infested fields as soon as the crop can 

 be removed should greatly lessen injury the next year. As this 

 species seems to prefer spinach to beet, Dr. Chittenden has 

 suggested that spinach might be used as a trap crop in large 

 fields of sugar beets where the injury warranted such a measure. 



