LIST OF TEXT FIGURES 



Page 



Fig. 1 A good type of traction sprayer for field use. (Original) 33 



Fig. 2 Knapsack sprayer. (Original) 36 



Fig. 3 Hand sprayer. (Original) 36 



Fig. 3-a A Home-made sprayer 



Fig. 4 Scales from wing of moth of western army cutworm, highly 



magnified. (Original) 42 



Fig. 5 Adult snapping-beetle, Alans ocutatus. The larvae of this 



beetle feed upon decaying wood. (Original) 52 



Fig. 6 A sugar beet infested with sugar beet namatodes. The white 

 bodies of the female nematodes can be seen clinging to the 



rootlets. (Original) 60 



Fig. 7 A sugar beet affected with curly-top, showing the character- 

 istic dense mass of rootlets. (After C. O. Townsend, 

 Farmers' Bulletin No. 122, U. S. Department of Agri- 

 culture) 60 



Fig. 8 Small sugar beets infested with the root-knot nematode. The 

 bead-like swellings on the small roots and the enlarge- 

 ments of the main root are caused by the nematodes. 



(Original) 64 



Fig. 9 Sugar beet badly damaged by webworms 69 



Fig. 10 Sugar beets badly damaged by webworms 70 



Fig. 1 1 Field of sugar beets showing work of the sugar beet webworm. 



(Original) 71 



Fig. 12 Result of spraying left, unsprayed; right, sprayed 73 



Fig. 13 A portion of the compound eye of a tiger-beetle, highly mag- 

 nified. (Original) 76 



Fig. 14 Cross section through burrow of the solitary wasp. 



(Original) 78 



Fig. 15 Hopper dozer. (After Charles R. Jones, Bulletin No. 233, 



Colorado Agricultural Experiment Station) 102 



Fig. 16 Exposed grass roots, showing grasshopper eggs and larvae of 



the ground beetle, Amara obesa. (Original) 106 



Fig. 17 Hair worm escaping from a parasitized ground beetle. 



(Original) 107 



Fig. 18 The hair worm shown in Figure 17, after it had escaped from 



the beetle. (Original) 108 



Fig. 19 Grasshoppers killed by the fungous disease, Empusa grylli. 



(Original) . 109 



