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BRITTAIN, XI. H. (2278) 
1923. THE EUROPEAN APPLE SUCKER (PSYLLIA MALI SCHMIBBERGER) . Nova 
Scotia Dept. Agr. Bull. 10, 69 pp. [Abstract in Rev. Appl. Ent. 
(A) 11: 383. 1923.] 
Sulphur nicotine dusts arc fairly effective but are heavy and 
difficult to apply with most machines. Copper-lime nicotine dusts are- 
less effective, a large proportion of the nicotine in them remaining 
inactive. Busts containing a large proportion of lime are light and 
easy to apply, and the nicotine in them is more active. 
CAMPBELL, R. E. (2279) 
1923. NOTES pN NICOTINE DUST PROGRESS. Jour. Econ. Ent. 16: 497-505. 
[Abstract in Rev. Appl. Ent. (A) 12: 81. 1924.] 
A historical account of the use of nicotine in dusts. A biblio- 
graphy of 50 papers is given. 
LOVETT, A. L. (2280) 
1923. NICOTINE BUST. Wash. State Hort. Assoc. Proc. 19, pp. 12-18. 
The literature on this subject is briefly reviewed, and the 
author says that he is sold to the general idea of nicotine dusts. 
In regard to simplicity, ease, and thoroughness of application, as 
compared with liquid spray, there is no comparison. The following 
factors are to be considered as handicaps in the successful and 
general employment of nicotine dusts: temperature, moisture, wind, 
loss of nicotine, time nicotine is active, and cost. 
CARPENTER, C. F. G-. (2281) 
1924. INSECTS AND INSECTICIDES. Citrus Indus. 5 (2): 11, 
The chief contact insecticides, for use against sucking insects, 
are nicotine, nicodust, nico sulphur dust, lime- sulphur , emulsions, 
miscible oils, and soaps. Nicodusts and nicosulphur dusts are now 
widely used with excellent results. The nicosulphur dusts control 
mildew and other fungous diseases as well as plant lice. 
2 . Preparations of Dusts, Dusting Machin e ry, and Principles Involved, 1921-1932 
CAMPBELL, R. E. (2282) 
1921. NICOTINE SULPHATE IN A DUST CARRIER AGAINST TRUCK CROP INSECTS. 
U. S. Dept. Agr. Dept. Circ. 154, 15pp., illus. [Abstract in Rev. 
Appl. Ent. (A) 9: 389-390. 1921.] 
The use of nicotine sulphate in dust form having been successful 
in controlling Chromaphi s .juglandicola Kalt. (walnut aphid) experiments 
were carried out with this insecticide against the following pests: 
