258 Keport of the DepartxMent of Entomology of the 



Time of tests in Tahlc VI. — Spring treatment. Trees sprayed 



April 18. 



Table VI. — Spring Spraying in Orchard II. 



Trees. Strength 



, • . of 



Nil 'II Iter petro- 



Kirid. Heated. Degree of infestation. leuin. Kesiilta. 



]'er ct. 



Pear: 



Bartlett 4 2 Extensively and 2 2o Scales not afferted. 



mildly infested. Trees uninjured. 



Bartlett 4 2 Extensively and 2 40 Scales dead. Trees 



mildly infested. uninjured. 



Bartlett 4 3 Extensively and 1 GO Scales dead. Trees 



mildly infested. uninjured. 



Bartlett 4 All mildly infested. . . 100 Scales dead. Trees 



uninjured. 



Weather during tests in Table VII. — Winter and spring treat- 

 ment. Trees sprayed Dee. 8 and April 18. Dec. 8 temperature 

 29°, cloudy. Weather during the week following alternating 

 cloudy and fair with average temperature of 22°. 



Tap.le VII. — Winter and Spring Spraying in Orchard II. 



Trees. Strength 



• ^ ot 



Nniriber petro. 



ICiutl. tioaled. Degree of infestation. leum. Kesults. 



Per et. 



Pear: 



Bartlett 3 1 Extensively and 2 25 Scales show slight 



mildly infested. effect of treatment. 



Trees uninjured. 



Bartlett 4 2 Moderately and 2 40 Scales dead. Trees 



slightly infested. uninjured. 



Bartlett 4 2 Moderately and 2 60 Scales dead, 1 tree 



slightly Infested. dead, 1 nearly dead 



and 2 seriously in- 

 jured. 



Bartlett 4 1 Extensively and 3 100 Scales dead, 3 trees 



moderately infested. dead, 1 nearly dead. 



summary for orchard II. 



The experiments in this orchard indicate that the 25 per ct. 

 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 



