- 567 - 
require a longer exposure than 5 minutes. Oil emulsions, lime-sulphur, 
and soap sprats are satisfactory for aphids before the leaves are curled, 
and their efficacy is increased "by the addition of nicotine sulphate. 
ivJLLER, R. L. ' (2368) 
1926. SNUFF aS AN INSECTICIDE. Fla. Hort. Soc. Proc. 1926. 39: 155-168. 
[Abstract in Rev. Appl. Ent. (A) 16; 197. 1928.] 
Dry snuff (nicotine = 2'. 05 percent) was ineffective but 2 parts 
snuff + 1 part finely ground anhydrous calcium chloride caused 96 
percent mortality of the citrus aphid Aphi s pomi DeG-. A spray of 11 
lb. snuff in 50 gal. water killed 95 percent of the aphids within 24 
hours. When the foliage was v/et with dew snuff caused 99 percent 
mortality. The same kill was given by a lime-nicotine sulphate dust. 
WALDEI, B. H. (2369) 
1923. NICOTINE DUST -AS A CONTROL TOR THE TURNIP APHID. Conn. Agr. Sxpt. 
Sta. Pull. 247, pp. 346-347. [Abstract in Rev. Appl. Ent. (A) 11: 557. 
• 1923.] 
Swedish turnips that were heavily infested with Aphis pseudobras - 
sicae Davis were effectively dusted with a sulphur nicotine dust contain- 
ing 5 percent nicotine sulphate, equivalent to 2 percent of nicotine. 
CAESAR, L. (2370) 
1927. AN OUTBREAK OP TEE TURNIP APHID, APHIS PSEUDOERASSICAE DAVIS. 
Ontario Ent. Soc. 57th Ann. Rept. 1926, pp. 41-43, [Abstract in Rev. 
Appl. Ent. (A) 15: 666-667. 1927.] 
It is believed that dusting is the only method that will prove 
effective on a large scale, a dust of 5 lb. 40-percent nicotine sul- 
phate and 95 lb. hydrated lime killed almost all the aphids when applied 
on both sides of the row. 
iviOERIS, H. Li. (2371) 
1931. ANNUAL REPORT OP THE ENTOiuOLOG-IST POP. 1930. Cyprus Dept. Agr. 
Ann. Rept. 1930, pp. 48-55. [Abstract in Rev. Appl. Ent. (A) 20; 
101. 1932.] 
Eicotine sulphate, used either as a dust or a spray, gave satis- 
factory results against Aphis r umicis L. , which had caused considerable 
injury to beans early in the season in Cyprus. 
WATSON, J. R. , and BEYER, A. H. (2372) 
1925. CONTROLLING TEE CITRUS APHIS (AP HIS SPIRAECOIA PATCH) . Pla. Agr. 
Expt. Sta. Bull. 174, pp. 81-96, illus. [Abstract in Rev. Appl. 
Ent. (A) 13: 324-325. 1925.] 
A 3 percent nicotine sulphate-lime dust is recommended. In- 
