184 



PESTS OF GARDEN AND FIELD CROPS 



on which the first generation often is raised. There are from three 



to five generations annually. The adult is a yellowish moth, 



expanding three fourths of an inch. 

 Winter is passed as larva or pupa in 

 the soil. 



In garden or small areas, the pest 

 may be controlled by prompt appli- 

 cation of Paris green or arsenate of 

 lead. Fall plowing will help for the 

 next season. Alfalfa should be well 



disked. No pigweed should be allowed to grow in or near the 



garden or field. 



^^f^^i^f^ 



Fig. 223. — The Garden Web- 

 worm. Original. 



The Sugar-beet Webworm {Loxostege sticticalis Linn.) 



The work of this species is practically identical with that of the garden 

 webworm. Recently it has developed into a serious pest of sugar beets 

 in some of the Western states. The larva is an inch long when full grown, 

 brownish in color, with a narrow dark stripe edged with white down the 



Fig. 224.— The Sugar-beet Web- 

 worm. Original. 



Fig. 225. — Adult of the Sugar-beet 

 Webworm. Original. 



middle of its back, and a light stripe down each side. There are 

 numerous dots over the surface of its body. It webs up the foliage 

 as it works. 



Winter is passed in a silk cocoon in the soil. The moths emerge in 

 the spring and lay eggs on the leaves of pigweed and alfalfa. There is a 

 second generation in July and a third in August. It is the last that is 

 usually most injurious to sugar beets. 



