- 537 - 
The application against the onion thrips (Thrips t abaci Lind.) 
of nicotine sulphate or derrisol, each at the rate of 1 to 800 parts 
of a solution of penetrol and water (1:200) increased the yield of 
onions "by 24 percent (p. 357). Tests showed that a nicotine spray is 
more effective against the Mexican mealybug ( phenacoccus gossypii Tns. 
and Ckll.) when it is heated to 120° F, especially where only low- 
pressure equipment is available . (p. 358). 
HUCKETT, H. C (2263) 
1933. THE SPRAY VALUE OF NICOTINE SUPPLEMENTS POP. APHIDS. N. Y. (Geneva) 
Agr. Expt. Sta. Tech. Ball. 210, 20 pp., illus. [Abstract in Rev. 
Appl. Ent. (A) 22: 177. ' 1934.] 
The author described the technique and gives the results of 
greenhouse tests on the effect of adding various proprietary materials 
as activators to sprays of 40-percent nicotine sulphate against aphids. 
Increased mortality was obtained in all tests with Penetrol, which was 
used at the strength of 1 to 200, and with two other miscible mineral 
oils at 1 to 100 and three soaps at 1 to 150; a miscible pine-tar oil 
at 1 to 100 was less satisfactory, and a powdered gum was usually ineffect 
PARKER, 17. B. (2264) 
1933. VAPO DUST-A DEVELOPMENT IN SCIENTIFIC PEST CONTROL. Jour. Scon. 
Ent. 26 (3): 718-720, illus; [Abstract in Rev. Appl. Ent. (A) 21: 
473-474. 1933.] 
Tests in controlling a serious infestation of the grape leafhopper 
( E r.y th r o n eur a comes Say) showed that small quantities of phytonomic 
oils when combined with a small amount of nicotine were very effective 
against both nymphs and adults without causing injury to the grape vines. 
SCHOENE, T7. J. (2255) 
1933. SPRAY TESTS FOR THE T7HITE APPLE LEAFHOPPER TYPHLOCYBA POMARIA . 
Jour. Econ. Ent. 26 (2): 325-329.' [Abstract in Rev. Appl. Ent. (a) 
21: 328. 1933.] 
In Virginia a single application of a spray consisting of 1 gal. 
summer oil and 3/4 pt . 40-percent nicotine sulphate to 100 gal. water 
proved effective when made while the leafhopper was still in the nymphal 
stage. A combination consisting of l/2 gal. penetrol and l/2 pt . 40-percent 
nicotine sulphate to 100 gal. water also proved effective against the 
nymphs, and neither spray caused injury to fruit or foliage. 
EDDY, CO. (2266) 
1934. THE ROLE OF SOME SOUTHERN PINE PRODUCTS IN THE CONTROL OF APHIS 
RULIICIS LINN. Jour. Econ. Ent. 27: 398-400. 
