INSECTS INJURIOUS TO BEETS AND SPINACH 



301 



they will be found to be worse on lands previously in sod, which 

 should therefore be avoided when known to be badly infested with 

 either of these insects, as both are difficult to fight after they have 

 once commenced doing noticeable injury. 



The life histories and means of control for these pests will be 

 found discussed in Chapter VII. 



The Sugar-beet Webworm * 



The sugar-beet webworm is very similar to the garden web- 

 worm, and is so named because it has developed as a serious 



FIG. 255. The sugar-beet webworm (Loxostege sticticalis Linn.): 1, moth; 

 2, eggs; 3, 4, larvae; 5, pupa; 6, winter tube of larva, opened at a to 

 show pupa 1, 3, 4, 5, enlarged. (After Gillette, Colo. Agr. Exp. Sta.) 



pest of the sugar-beet in Kansas, Nebraska, and Colorado. It 

 has been noted as injuring tansy in Michigan, and feeds on 



* Loxostege sticticalis Linn. Family Pyraustida. See C. P. Gillette, 

 Bulletin 98, Colo. Agr. Exp. Sta., and references there given. 



