30 



FAEMEES BULLETIN 856. 



BEET AKMY WORM. 



The beet army M^orm (fig. 30) is more injurious to beets than to 

 other plants; hence the name. When numerous it is found also on 



potatoes, peas, onions, and other 

 vegetables and grasses. It is a 

 "western form and capable of 

 doing much damage. 



Control. — When occurring in 

 moderate numbers this insect 

 can be held in control b}^ lead 

 arsenate; when unusually 

 abundant, remedies used for the 

 true army worm are necessary. 

 (See Farmers' Bulletin 835, pp. 

 9-11.) 



IG. 30.— The beet army worm (Caradrina 

 exiQua) : a. Moth; &, larva, side view; 

 c, larva, dorsal view ; d, head of larva ; 

 e, egg, viewed from above ; f, egg, from 

 side. All enlarged.- 



BEET WEBWORM. 



Several forms of webworms 

 attack beets by eating the leaves, 

 which become Avebbed together 

 in the growing plants. The 

 most injurious species is illustrated in figures 31 and 3-2. 



Control. — Arsenate of lead spray. Gardens should be kept free 

 from such weeds as pigweed and lamb's- 

 quarters, since these encourage web- 

 worms and permit their spread. 



WHITE GRUBS AND 

 WIREWORMS. 



Fig. 32. — The fugar- 

 beet webworm (Lox- 

 osteye sticticaJis) : 

 Full - grown larva. 

 Enlarged. 



White grubs and 

 wireworms do con- 

 siderable damage to 

 beets, especially if 

 beets are grown in 

 prairie and alkali 

 land. For control, 

 see "White grubs" and " AV ire worms " (])p. IG 

 and 17). 



LEAF-SPOT. 



Fig. 31. — The sugar-beet webworm 

 (Loxustcyc sticticalis) : Moth. 

 Twice natural size (Howard 

 and Riley). 



In leaf-spot, circular, brown, dead spots appear 

 on the leaves (fig. 33). Spray with Bordeaux 

 mixture when the first spots appear and repeat at 10-day intervals. 



