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nicotine sulphate have "been used with good results "but should only 
be applied on clear calm days with a temperature of not less than 
65° T. and preferably 70° or higher. 1 The foliage should be dry. 
THATCHER, R. T7. (2338) 
1927. FORTY-FIFTH JLHHUA1 2EP0.iT FOE THE FISCAL YEAR ENDED JUNE 30, 
1926. N. Y. [Geneva] Agr. Expt. Sta. Rept., 69 pp. [Abstract in 
Rev. Appl. Ent. (A) 15: 150-151. 1927.] 
Tests showed that lubricating oil emulsions are not so ef- 
fective in controlling the rosy aphid ( An uraphi s rose us Baker) 
as lime-sulphur containing nicotine sulphate. Tests hy other workers 
have indicated that the effect of dusts of tobacco and hydrated lime 
is more rapid under humid conditions, but dusting cauliflower seedlings 
wet with dew caused injury to the plants. A species of Collembola, a 
new pest of cabbage seedlings, may be controlled by tobacco dust. The 
most practical method for destroying striped cucumber beetles (Dia- 
bro tic a vitatta Say) is to drive them from the main crop by dusting to 
a trap crop of squash seedlings; the next day they may he killed by 
means of box fumigators, using a dust of 4 to 5 percent nicotine 
content and an exposure of 3 to 5 minutes. 
T7ALDR0N, H. (2339) 
1927. DUSTING OF CITRUS TREES* Fla. Hort. Soc. Proc. 40: 69-72. 
[Abstract in Rev. Appl. Ent. (A) 16: 199. 1928.] 
Spraying with lime- sulphur kills red spider and immature coccids 
and hos the additional advantage that nicotine sulphate can be added 
to the spray at the rate of 1 qt. to 200 gal. to control aphids more 
.economically than by dusting. Nicotine dust has "been successfully 
used against aphids where there are no air currents, but this condition 
is almost unknown. 
GLENDENNING, R. (2340) 
1928. SOME OBSERVATIONS ON NICOTINE DUST. Ontario Ent. Soc. 58th 
Ann. Rept., 1927, pp. 25-27. [Abstract in Rev. Appl. Ent. (A) 
17: 90-91. 1929.] 
"The results of applications of nicotine dust depend on the 
percentage of nicotine in the dust, the condition of the atmosphere, 
and the length of the exposure of the insect to the funos; and ex- 
periments were carried out with hydrated lime as a carrier for the 
nicotine, to determine the effect of these factors. 
"The strength necessary to kill varied with the insect; for 
P hyllotreta albi onica Lee. (cabbage flea-beetle) a dust containing 
3 percent actual nicotine was required to obtain a £0 percent kill, 
though Phorodo n h umul i Schr. (hop aphis) was readily destroyed with 
a 1 percent dust. A 4 percent dust killed almost all the flea-beetles, 
but was inclined to be too damp and to cake, and was not distributed 
