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17. Headlee, Thos. J., In 42d Ann. Rept. of N. J. State Agr. Exp. Sta. for 1921. 
Effect of nicotine-impregnated dust on leafhopper on the apple. Effect 
of different sprays and dust on apple aphis—species Aphis avenae. 
p. 374-375, pub. 1922. 
18. Howard, W. L. Nicotine dust and Typhlocyba comes. In California Culti¬ 
vator, v. 56, p. 671, 1921. 
19. McIndoo, N. E. Effects of nicotine sulphate as an ovicide and larvicide on 
the codling moth and three other insects. By N. E. McIndoo, F. L. 
Simanton, H. K. Plank and R. J. Fiske. 1921. U. S. D. A. Bui. 938. 
20. Headlee, T. J., and Rudolfs, Willem, Jr. Econ. Ent., vol. 15, No. 1, Feb. 
1922, p. 75-81. Some further experience with contact dusts. 
21. Parrott, P. J., Jr. Econ. Ent., Vol. 15, No. 1, Feb. 1922, p. 82-85. Control of 
sucking insects by dusting. 
22. DeLong, D. M., Jr. Econ. Ent., vol. 15, No. 1, Feb. 1922, p. 87-90, pi. 2. 
The boom nozzle system and the traction duster as factors in grape 
leafhopper control. 
23. Britton, W. E., Zappe, M. P., and Stoddard, E. M., Conn. Exp. Sta., New 
Haven, Bui. 235, Feb. 1922. Experiments in dusting vs. spraying on 
apples and peaches in Connecticut in 1921. p. 207-226. Ills. pi. xvii- 
xxii. 
24. Cardinell, H. A., and Page, E. M., Univ. of Missouri Ex. Circ. 110, Mar. 1922. 
Melon pest control in southeast Missouri. 20 p. Nicotine sulphate 
dust p. 4-5. 
25. Russell, H. L., and Morrison, F. B., Ann. Rept. Agr. Exp. Sta. Univ. of 
Wisconsin, 1920-1921. Nicotine dust employed against insects, p. 
59-61 (Wis. Agr. Exp. Sta. Bui. 339, Feb. 1922, 193 p.) 
25-A. Cardinell, H. A., and Page, E. M., Truck crop pests controlled by 
new methods. Market Growers’ Journal, Vol. 30, No. 9, May 1, 1922. 
26. White, W. H., Circ. 224, U. S. D. A., June, 1922, Nicotine dust for control of 
the striped cucumber beetle ( Diabrotica vittata Fab.) 8 p. ills. 
27. Essig, E. O. (Notes on control of caterpillars with nicodust.) In Jr. Econ. 
Ent., vol. 15, No. 3, June, 1922, p. 247. 
28. Campbell, R. E., Farmers’ Bulletin 1282, U. S. D. A., Sept. 1922, Nicotine 
dust for control of truck crop insects. 24 p. illus. 
29. Geise, F. W., Zimmerley, H. H., and Spencer, Herbert, Virginia Truck 
Exp. Sta. Bui. 41, Oct. 1922, Spraying and dusting vegetable crops in 
1922, p. 237-256. Figs. 47-57. 
30. Flebut, A. J., Use of nicotine dust in the control of citrus thrips. Calif. 
Dept. Agr. Monthly Bui. v. 11, No. 10, p. 745-754. Oct. 1922. 
31. Rudolfs, Willem, In Jr. Econ. Ent., Vol. 15, No. 6, Dec. 1922, p. 421-424. 
Nicotine delivery from dust carriers. 
32. Parrott, P. J., Stewart, F. C., and Glasgow, Hugh, N. Y. Geneva Agr. Exp. 
Sta. Cir. 63, Dec. 1922. Spraying and dusting experiments with apples 
in 1922. 8 p. 
33. Hartzell, F. Z., N. Y. Geneva Agr. Exp. Sta. Circ. 65, Dec. 1922. Spraying 
and dusting experiments for pear Psylla in 1922. 8p. 
Cory, E. N., In Jr. of Econ. Ent., Vol. 16, No. 1, Feb. 1923, p. 81-84. Dusting 
for the pea aphis. 
34. 
