E O G Kelly and T. S. Wilson, "Controlling the Garden Webworm in Alfalfa 

 Fields,'" Farmers' Bulletin No. 944, U. S. Department of Agriculture (1918). 



Emst A. Bessey and L. P. Byars, "The Control of Root-knot," Farmers' Bulletin 

 No. 648, U. S. Department of Agriculture (1915). 



C O Townsend, "Curly-top, A Disease of the Sugar Beet," Bulletin No. 122, 

 Bureau of Plant Industry, U. S. Department of Agriculture (1908). 



Harry B. Shaw, "The Curly-top of Beets," Bulletin No. 181, Bureau of Plant Indus- 

 try, U. S. Department of Agriculture (1910). 



C. O. Townsend, "Field Studies of the Crown-gall of'Sugar Beets," Bulletin No. 203, 

 U. S. Department of Agriculture (1915). 



F. B. Milliken, "Grasshoppers and Their Control on Sugar Beets and Truck Crops," 

 Farmers' Bulletin No. 691, U. S. Department of Agriculture (1915). 



Charles R. Jones, "Grasshopper Control," Bulletin No. 233, The Agricultural 

 Experiment Station of the Colorado Agricultural College (1917). 



W. R. Walton, "Grasshopper Control in Relation to Cereal and Forage Crops," 

 Farmers' Bulletin No. 747, U. S. Department of Agriculture (1916). 



E. D. Ball, "How to Control the Grasshoppers," Bulletin No. 138, Utah Agricultural 

 College Experiment Station (1915). 



Leland O. Howard, "Insect Book" of the "New Nature Library" (1914). 



F. H. Chittenden, "Insects Injurious to Vegetables" (1907). 



E. D. Sanderson, "Insect Pests of Farm, Garden and Orchard." 



J. R. Parker, "Influence of Soil Moisture upon the Rate of Increase in Sugar-beet 

 Root-louse Colonies," Journal of Agricultural Research, Vol. IV, No. 3 (1915). 



C. P. Gillette and Geo. M. List, "Insects and Insecticides," Bulletin No. 210 of the 

 Agricultural Experiment Station of the Colorado Agricultural College (1915). 



Singerland and Crosby, "Manual of Fruit Insects." 



E. W. Scott, W. S. Abbott and J. E. Dudley, Jr., "Results of Experiments with 

 Miscellaneous Substances Against Bedbugs, Cockroaches, Clothes Moths, and Carpet 

 Beetles," Bulletin No. 707, U. S. Department of Agriculture (1918). 



Harry B. Shaw, "The Sugar Beet Nematode and Its Control," Reprint from 

 "Sugar." 



Wm. H. White, "The Sugar-beet Thrips," Bulletin No. 421, U. S. Department of 

 Agriculture (1916). 



H. O. Marsh, "The Sugar-beet Webworm," Bulletin No. 109, Part VI, Bureau of 

 Entomology, U. S. Department of Agriculture (1912). 



H. R. Cox, "Weeds: How to Control Them," Farmers' Bulletin No. 660, U. S. 

 Department of Agriculture (1915). 



