212 



MONTANA EXPERIMENT STATION. 



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

 and salt wash, and certahi 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 swollen almost to the point 

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



Figure 3. Oystei'-shell Bark-louse; a. adult male; b, Coot 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. 



