10 



cial rock lime varies somewhat in purity and is cheap. 

 The excess of lime simply forms a whitewash which 

 shows plainly the trees that have been treated. An excess 

 of sulfur would remain undissolved in the solution. 

 While this would do no harm, its presence would do no 

 good and it might be considered as a needless item of 

 waste. Both lime and sulfur are effective for some in- 

 sects and fungi when used separately, but when combined 

 they act far more efficiently. The principal object in 

 making the wash is to produce economically a safe and 

 thoroughly effective spraying solution. 



In planning for making and using this wash a number 

 of practical points require consideration for best results. 



Estimation of Quantities of Chemicals Needed. — 

 Naturally this is a difficult matter for the man who has 

 never used anything of the kind. The first consideration 

 is the number and the average size of the trees to be 

 treated. If the scale is known to occur anywhere in an 

 orchard, the only safe thing to do is to spray all trees in 

 it, and the treatment should include at least all of our 

 fruit trees which shed their leaves in the Fall. The 

 amount of spray required will obviously depend directlj'' 

 upon the size of the tree. We may take average three to 

 four-year-old peach trees as our standard and eistimate that 

 such trees will require about one-half gallon of spray each 

 for thorough work, and no other kind of work is worth 

 while. Each gallon of spray solution will therefore ti'eat 

 two medium-sized trees, while large trees may require two 

 gallons each. In this way an approximate estimate may 

 be made of the number of gallons of spraying solution to 

 oe prepared. 



The question of formula must be next considered. As 

 a result of a vast amount of experimental and practical 

 work, it appears that the following formula is safe, effi- 

 cient and economical : 



Rock lime 20 lbs. 



Flowers of Sulfur or Sulfur Flour ...15 lbs. 

 Water to make 50 gallons 



