— 523 — 
In 1925 the following spray mixture was tried as a deterrent 
against the pear midge ( Perrisia py ri Bch.) in New Zealand: Black 
Leaf 40 (1:800) and 2 percent mineral oil (sold as Olene). A 
certain amount of leaf scorch was produced, consequently oil was 
not used again. 
The following spray mixture was applied to a "block of 18 three- 
year-old trees: Black Leaf 40 (1:800), solution of glue, l/2 lb. 
soap, and 100 gal. water. This spray was an effective deterrent of 
midge-infestation during October and November. 
JACOB SEN,- T7. C : (2211) 
1927. REPORT FOR 1926 OF THE BUREAU OF PLANT QUARANTINE AND PEST CONTROL 
Calif. Dept, Agr. Monthly Bull. 15 (7-12): 113-142. [Abstract in Rev. 
Appl. Ent. (A) 16:- 193-195. 1928.] 
Preliminary field tests with nicotine sulphate and refined oil 
emulsions gave very satisfactory control of Drepanothrips reuteri Uzel 
attacking grape. 
DE ONG, E. R. (2212) 
1928. PETROLEUM OIL AS A CARRIER FOR INSECTICIDES AND AS A PLANT STIMU- 
LANT. Indus, and Engin. Cnem. 20: 826-827. [Abstract in Rev. Appl. 
Ent. (A) 17: 512-513. 1929.] 
Nicotine is miscible in certain kerosenes up to 12 percent and the 
rate of volatility from light oils is similar to that from water. Kero- 
sene alone used as a 2 percent emulsion killed 79.5 percent of brown 
apricot scales ( Lecanium corni Bch.); kerosene plus 0.01 percent free 
nicotine killed 92.4 percent. Oils can be used for their physical 
rather than their insecticidal properties. 
(2213) 
1928. PETROLEUM OIL AS A CARRIER FOR NICOTINE. Jour. Econ. Ent. 21: 
502-504. [Abstract in Chem. Abs . 22: 4197. 1928.] 
Oil + .01 and .02 percent nicotine was more effective against 
the brown apricot scab ( Lecaniu m corni ) than oil alone. Kerosene and 
three highly refined petroleum' oils were tested as insecticides with 
and without the addition of nicotine (0.01 and 0.02 percent) for the 
brown apricot scale (Lecanium corni ) . The oil-nicotine mixtures were 
more effective than the oils alone. It was also found that kerosene- 
nicotine was nearly as efficient as the heavier oils mixed with nico- 
tine with advantages to the former, in favor of cost and danger to 
plant tissues. Oil-nicotine mixtures are promising for use on trees 
in foliage. They probably will not offer advantages over other oil 
preparations for dormant spraying. 
(2214) 
1928. PROGRESS REPORT ON THE USE OF PETROLEUM OIL AS AN INSECTICIDAL 
SPRAY. Jour. Econ. Ent. 21 (4): 525-529. [Abstract in Rev. Appl. Ent 
(A) 16: 671. 1928.] 
