212 



MONTANA EXPERIMENT STATION. 



puropse of determining the value or non-value of the lime, sulphur 

 and salt wash, and certain modifications of the wash, as-a means of 

 destroying the eggs of this scale insect. 



The experiments were conducted in the apple orchard of Mr. 

 Delaney. At the time, pear buds were swoHen almost to the point 

 of expanding their lirst leaves and apple buds were slightly swollen. 



Figure 3. Oystei'-ghell Bark-louse; a. adult male; b, foot of 

 same; c, young larve; d, antenna of same; e, adult female taken 

 from scale; a, c, e, greatly enlarged; b. d, more enlarged. 

 (Howard, Yearbook, U. S. Dept. of Agr.) 



The trees are large and were badly infested with this insect. Seven 

 to nine trees were used in each experiment, each lot being sprayed 

 with a different mixture, but the total number of trees used consti- 

 tuted but a small proportion of the orchard. The spraying was done 

 April 21 and 22. 



