- 524 - 
The incorporation of nicotine or other active insecticides 
directly into the oil before emulsifying offers the possibility of 
increasing the toxicity of the oil itself without increasing the 
danger to the plant . 
(2215) 
1928. SPECIFICATIONS FOR PETROLEUM OILS TO 3E USED ON. PLANTS. Jour. 
Econ. Ent. 21: 697-702. [Abstract in Rev. Appl . Ent. (A) 17: 75. 1 
Lower insecticidal value resulting from the use of highly re- 
fined oils may be compensated for in part by incorporating other and 
more active chemicals such as nicotine. Specially refined pine oils 
may also be found useful as solvents for nicotine blends with petrole* 
oils, particularly for use on citrus. 
(2215) 
1929. THE CHARACTERISTICS AND USES OP PETROLEUM OIL SPRAYS. Trans. 
Internatl. Cong. Ent. 1928, 2: 145-154, illus . 
It was found in a number of instances that the oil-nicotine coi 
binations interfered less with the functioning of the leaf than did 
the same oilused alone. In. all those combinations an uncombincd 
(95-percent) nicotine was used. A distinct advantage. in the oil— nico 
tine combinations was that of the uniformly high toxicity obtained 
against the brown apricot scale ( Lecanium corni Bch.) (pp. 146- 147). 
HARMAN, S. 77. (2217) 
1930. THE EFFICIENCY OF VARIOUS INSECTICIDES IN CONTROLLING THE BUD 
Jour .Econ. Ent. 23: 184-187. [Abstract in Rev. Appl. Ent. (a) 18: 
402-403. 1930.] 
In orchards heavily infer, ted with Eucosma (Spilonota) o cell ana 
Schiff., nicotine was the only material to which the overwintering 
larvae were susceptible. In such cases twice the usual dose of 1 pt . ' 
40-percent nicotine sulphate was required. TThen used with linseed oi 
or fish oil (l qt.in 100 gal.) or with lubricating oil emulsions the 
effectiveness of the nicotine was apparently increased. Lead arsenat 
which was apparently of little value early in the season was effoctiv 
in midsummer when used at the rate of 3 lb. to 100 gal. either alone 
with the addition of 1 pt. nicotine sulphate during the egg-hatching 
HEADLEE, T. J. (2218) 
1930. REPORT OF THE DEPARTiaSNT OF ENTOMOLOGY. N. J. Agr. Expt. St a 
Rept. 1928-1929, pp. 125-207, illus. [Abstract in Rev. Appl. Ent. ( 
19: 168. 1931.] 
