MONTANA EXPERIMENT STATION. 231 



but one, since Mr. Allen's orchard was purchased and fenced oft* 

 from the other larger one, the fence, in fact, passing diagonally- 

 through one row. The trees on the other side of the fence were 

 badly infested the following summer, thus giving us greater con- 

 fidence in the efficiency of our treatment. 



It appears that all of the first three sprays were equally effective 

 Spray No. 3 ^-1-4 contains only enough lime to cause the sul- 

 phur to go into solution, thereby making the caustic ingredient of 

 the mixture. The spray when ready to apply is clear and transparent 

 instead of milky as is No. 2, which has an excess of lime. In spray 

 No. I, the excess of lime goes onto the tree merely as a whitewash. 

 We are not prepared to say that there is not some benefit in having 

 this excess of lime, and for the present we recommend the use of 

 spray No. 2. We do not feel that the addition of salt in spray No. i 

 renders the wash of any more value. 



In conclusion, we recommend, as a means of holding this mite 

 in control, a thorough spraying with lime-sulphur-salt wash in the 

 1-1-4 proportion, in the spring of the year before the buds open. 

 Directions for the pieparation of this wash will be found on another 

 page of this report. (See index.) 



