334 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



the one most injurious in Colorado. Most of these larva? hibernate 

 over winter, but there is a partial fourth generation in Colorado- 

 The larva) defoliate the plants, and cover them with a web the 

 same as the native garden webworm, with which the life history 

 seems to be practically identical. 



Control. The same means of control as for the garden web- 

 worm are advised. 



The Beet Army Worm * 



" This caterpillar, which replaces the fall army worm (L. 

 frugiperda see page 118) in the Western States, differs from 



FIG. 240. The beet army worm (Laphygma exigua Hiibn.): a, moth; b, 

 larva, side view; c, larva, back view; d, head of larva; e, 0gg from above; 

 /, egg from side all enlarged. (After Chittenden, U. S. Dept. Agr.) 



it by its more decidedly mottled ground-color, by a row of white 

 dots at the lower margin of the lateral dark band, and by the 

 yellower color of the light stripes. It is an interesting fact that 

 while the preceding species w r as doing serious, unusual, and wide- 

 extended injury in the Eastern and Southern States (1899), 

 the present one was similarly abundant in Colorado, where, 

 besides destroying many kinds of weeds and grasses, it com- 



* Laphygma exigua Hbn. Family Noctuidoe. 



