334 REPORT OF THE DEPARTMENT OF ENTOMOLOGY OF THE 
THE KEROSENE-LIMIE MIXTURE. 
s 
H. E. Hopaxiss Anp F. A. SIRRINE. 
This is one of the comparatively new sprays that has been in- 
troduced for the control of the San Jose scale and has attracted 
considerable attention through the efforts of the Delaware Agri- 
cultural Experiment Station.? The kerosene-lime mixture is a 
mechanical emulsion of lime, kerosene and water, the lime acting 
as a carrier for the oil, while the water serves largely as the 
‘diluent. Kerosene is one of the most penetrating and destructive 
of insecticides, but when applied pure may cause severe injuries. 
In the employment of lime it has been thought that a combination 
has been secured by which the oil could be more safely used. In 
these experiments tests have been made with Limoid and various 
grade and superfine limes from Ohio and New York. 
CONDITIONS. 
As has been done in other experiments, blocks of bearing apple, 
peach, and plum trees were selected for treatment. With the ex- 
ception of a few badly scale-encrusted trees the orchards in which 
the experiment was made were in a vigorous condition. The 
sprays were continued at irregular intervals during the spring 
and summer. 
THE MIXTURES AND THEIR PREPARATION. 
The mixtures were prepared in several percentages as follows: 
10 per ct., kerosene 5 gal., lime 20 Ibs., water to make 50 gal. 
124per ct. be 64 By Corea st ‘s 6s a: 50. « 
15 per ct. 74 i a 24 8 “6 7: rT 50. 
20 per ct. ‘ 10 uh aerat) . *! 7: c 6 50 
25 per ct. a 124 oe ae cs “ BQ 
30. per ct. ive. Tate egy. ee okt eens o? 
30 per ct. cl Sameer “7 « bathe eae 
40 per ct. ees h hes lee eat) 5s lat” dees ene 
The kerosene and lime were thoroughly mixed together into a 
thin “ sloppy ” mass and the required amount of water was added; 
*Del. Ag]. Exp. Sta. Press. Bulletin 14 (1904); Bul. 68 (1905). 
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