- 554 - 
YOTHERS, U. ff. , and COLE, F. R. 
(2319) 
1924. TEE CITRUS APHID, APHIS SPIBAECOLA PATCH. Citrus Indus. 5 ( 
6-8, 18, 19, illus. [Abstract in Rev. Appl. Ent. (A) 13: 
506. 1925.] 
Oil emulsions are apparently cheaper than nicotine sulphate 
(1:800) spray with soap, and "both sprays killed the aphids hit 
by them. Good resuxts were also obtained with a dust of 2 percent 
nicotine, 40 percent sulphur, and 58 percent inert ingredients. 
10) 
BEYER, A. H. 
(2320) 
1925. REPORT OP THE ASSISTANT ENTOMOLOGIST. Fla. Agr. Expt. Sta. 
Rept. 1924-1925, pp. 39R-41R. [Abstract in Rev. Appl. Ent. (A) 
14: 629. 1926.] 
A copper sulphate end lime dust plus 3 percent nicotine did 
not adhere so well as the bordeaux mixture. Under the hood of the 
spraying device (Rev. Appl. Ent. (A) 10: 532) the dust was about 
equal to the spray in the percentage of insects killed, but its 
effects were not so lasting, as the bordeaux mixture acts as a 
repellent. 
HAWLEY, I. M. 
(2321) 
1925. ENTOMOLOGY. Utah. Agr. Expt..Sta. Bien. Rept. 1923-1924, 
Bull. 192, pp. 42-44. [Abstract in Rev. April. Ent. (A) 13: 505. 
1925.] 
A dust of nicotine sulphate and a finely powdered carrier such 
as lime, sulphur, or gypsum gave good results against several species 
of aphids. 
WHITTINGTON, C. E. 
(2322) 
1925. DUSTING FOR CONTROL OF THE CITRUS APHID. Citras Indus. 6 (6) 
6. [Abstract in Rev. Appl. Ent. (A) 14: 427. 1926.] 
A 3 percent nicotine sulphate dust applied at the rate of 
l/4 lb. per tree has given very satisfactory results against Aphi s 
porni DeG. The applications were made over 40 acres to 8-year-old 
trees. The dusting should be done on calm nights, a low t emperature 
having little or no effect on the killing power of the nicotine. 
Applications should be repeated at 7 - 10 day intervals until the 
foliage is too mature for the aphids to injure it. 
WILCOX, J. 
(2323) 
1925. OBSERVATIONS ON S YNETA ALB IDA , LECONTE, IN OREGON AND EXPERIMENTS 
FOR ITS CONTROL. Jour. Econ. Ent. 18: 686-689, illus. [Abstract 
in Rev. Appl. Ent. (A) 13: 626. 1925.] 
