258 ReEeporvT OF THE DEPARTMENT OF ENTOMOLOGY OF THE 
Time of tests in Table VI.Spring treatment. Trees sprayed 
April 18. 
TABLE VI.—SPRING SPRAYING IN ORCHARD II, 




Trees, Strength 
oF pee tee Ee << toe Read By of 
Number petro- 
Kind. treated. Degree of infestation. leum. Results. 
Per ct. 
PEAR: 
Bartlett ...... 4 2 Extensively and 2 25 Seales not affected. 
mildly infested. Trees uninjured. 
|B} rR wil Css & 4-2 Extensively and 2 40 Scales dead. Trees 
mildly infested. uninjured. 
\ Bartlett ...... 4 3 Extensively and 1 60 Scales dead. Trees 
mildly infested. uninjured. 
Bartlett ...... 4 All mildly infested... 100 Scales dead. ‘Trees 
uninjured. 
Weather during tests in Table VIT.—W inter and spring treat- 
ment. Trees sprayed Dec. 8 and April 18. Dec. 8 temperature 
29°, cloudy. Weather during the week following alternating 
cloudy and fair with average temperature of 22°, 
TABLE VII.—WINTER AND SPRING SPRAYING IN ORCHARD II, 


Trees. ye 
< Number pater AF 
Kind. treated. Degree of infestation. leum. Results. 
Perret. 
PEAR: 
Bartlett ...... 8 1 Extensively and 2 25 Scales’ show slight 
mildly infested. effect of treatment. 
\ Trees uninjured. 
BS UGtitieete ct 4 2 Moderately and 2 40 Seales dead. Trees 
slightly infested. uninjured. 
Bartlettpeskis ae 4 2 Moderately and 2 60 Scales dead, 1 tree 
slightly infested. dead, 1 nearly dead 
and 2 seriously in- 
jured. 
Bartlett ese 4 4 1 Extensively and 3 100 Scales dead, 8 trees 
moderately infested. dead, 1 nearly dead. 
SUMMARY FOR ORCHARD II. 
The experiments in this orchard indicate that the 25 per et. 
emulsion cannot be depended upon to kill the dormant scales, 
while the 40 per ct. emulsion gives satisfactory results. The 
power of the pear tree to resist the injurious effects of crude 
petroleum is also indicated. There was no apparent injury to 
any of the trees sprayed once, although many were much weak- 
ened by the scale, except in one case where the trees were nearly 
