New York AGRICULTURAL EXPERIMENT STATION. 323 
Summary.—tThree different kinds of fruit trees and one variety 
of currants were used in these experiments, including 15 pears, 
17 plums, 1 crabapple and 2 currants, making a total of 35. In 
all cases there was no injury to pears except where pure oil was 
used in both Series I and II. Plums were not injured by one 
application at 40 per ct.; but seriously injured by two appli- 
cations, and also by one application of 100 per ct. 
SPRAYING EXPERIMENTS TO DETERMINE THE PERCENTAGE OF KERO- 
SENE OIL REQUIRED TO KILL THE SAN JOSE SOALEB WHILE 
HIBERNATING. 
Series I.—The trees were sprayed November 21. Weather 
cloudy and windy, temperature 42°. During the following week 
the weather varied from cloudy to clear with an average tem- 
perature of 28°. 
TABLE V.—PERCENTAGE OF KEROSENE REQUIRED TO KILL HIBERNATING 
San Jose SCALE: SERIEs I, 
dead. No injury 
to tree except 
bark on lower 
limbs and upper 
part of trunk 
slightly injured, 
but not serious- 
ly. 
Trees. Per- 
> - —  Cont- Degree of 
Kind. No. Age. age infestation. Results. Checks. 
Yrs. oil. 
PEAR: 3814 20 Badly infested; Scales appar- Seales but 
incrusted on ently not af- little affected 
some parts, fected by the by winter. 
oil, May 81 and Larvae a- 
later. bundant dur- 
ing follow- 
ing season, 
Bartlett, 4110- 20 Majority of No effect upon Same, 
, _ trees badly in- the scales. 
fested, others 
‘ moderately. 
Bartlett, 410 40 All badly infest- May 31. Scales Same, 
ed; incrusted in dead; three 
= places. trees not. in- 
jured; one tree 
slight yellowing 
of leaves. 
Bartlett, 110 100 Well infested. May 31. Scales Same, 
