- 558 - 
DTicotine sulphate dust with hydrated lime as a carrier having 
proved of value against Aphi s porni DeG. , tests have "been made to 
determine the effect of different weather conditions on its 
efficiency. In cold, windy weather, very little mortality resulted. 
The dust cloud surrounded the trees for only about 2 seconds. In 
cold and calm weather the dust did not drift further than the second 
row, out the results were disappointing. As wind cannot have been 
the cause of failure, the low temperature must have been responsible; 
this bea.rs out the finding of other investigators, namely, that "below 
60' E. little or no nicotine gas is evolved or liberated. On a warm 
day ('temperature 73 to 75° E.) and in a dead calm, it was observed 
that the cloud of dust remained for 30 seconds or more round the 
trees, and very satisfactory results were obtained; 98.1 percent 
of the aphids being killed. It is considered that much money is probably 
wasted by carrying out dusting operations while there is any breeze. 
ANONYMOUS (2335) 
1927. ENTOMOLOGY. Ohio Agr. Expt. Sta. Ann. Hept. 45 (1925-1926). 
Bull. 402, pp. 49-64, illus. [Abstract in Rev. Appl, Ent. 
(A) 15: 669-670. 1927.1 
Almost perfect control of Aphi s rumicis L. on lima beans 
( Phaseolus lunatus ) was effected by one treatment with a 1.6-percent 
nicotine dust applied with a self -mixing power duster equipped 
with a canvas drag which covered the rows for 10 feet or more behind 
the duster. 
HIXON, H, M., and DRAKE , C. J. (2336) 
1927. CHEMICAL TESTING OF NICOTINE DUSTS. Iowa State Coll. Jour. 
Sci. 1 (3): 373-377, illus. [Abstract in Expt. Sta. Rec. 57: 655. 
1927.] 
The authors conclude that the method proposed by Thatcher and 
Stricter (Expt. Sta. Rec. 49: 551) for chemical testing of the ef- 
ficiency of various carriers for nicotine dusts is not reliable. An 
apparatus is described for analyzing the nicotine vapor evolved from 
a dust, and results are reported on the toxicity of this vapor to 
the cabbage aphid and rice weevil ( Si tophi lus oryza L.). The evi- 
dence indicates that nicotine decomposition at various rates in the 
dust is due to oxidation. 
JST/ETT, H. H. (2337) 
1927. THE STRIPED CUCUMBER BEETLE. Ky. Agr. Expt. Sta. Circ. 37, pp. 
24-34. [Abstract in Rev. Appl. Ent. (A) 15: 607-608. 1927.] 
A dust containing 2 percent free nicotine failed to control 
the beetles ( Diabrotica yittata E.) and one made of 90 percent 
hydrated lime and 10 percent nicotine sulphate gave very little 
better result. This was largely due to the weather conditions 
prevailing in 1926. Nicotine dusts containing 4 to 10 percent 
