New York AGRICULTURAL EXPERIMENT STATION. oat 

Trees.! 
eat eee pat 50 } Results 
F Percent- : 
Kind. No. age oil. 
APPLE: 
Principally Bald- 10 20 Noinjury. 
winand Green- | 
ing. 
Principally Bald- 3 15 Noinjury. 
win and Green- 
ing. 
Principally Bald- 2 25 Noinjury. 
win and Green- 
ing. 
Principally Bald- 2 40 Noinjury. 
win and Green- 
ing. 
Principally Bald- 1 50 No injury. 
win and Green- 
ing. 
Principally Bald- 1 60 No injury. 
win and Green- 
ing. . 
Principally Bald- 1 100 Slight burning of the foliage. 
win and Green- 
ing. 
PEAR: , 
Dwarf Bartlett. 4 15 Noinjury. 
Dwarf Bartlett. 4 25 Very slight burning of foliage on wind- 
ward side. 
Summary.—tThese experiments show, principally, the difference 
between the 100° and 150° oils in their effects on apple and pear 
trees. The former injured the foliage in all cases, even with 15 
per ct., and when used at 60 per ct. and above seriously injured 
the bark as well. The 150° oil did not injure the trees except 
when used pure, when the foliage was slightly burned. 
GENERAL SUMMARY AND DISCUSSION OF RESULTS. 
The results taken as a whole indicate that peach and plum 
trees are more susceptible to injury by kerosene oil than apple 
and pear trees. Peach trees were the most sensitive, being 
killed by the lowest percentage (20 per ct.) used. The experi- 
ments to determine the percentage of high grade oil required to 
kill the scales showed very definitely that a 20 per ct. mixture 
had practically no effect, but that a 40 per ct. mixture killed the 
scales in every case. Kerosene oil of 100° fire test proved dan- 
gerous to apple foliage at a percentage as low as 15, while 150° 
1Trees in ful! bearing. 
