SPRAYING FOR SCALES 219 



Lime-sulphur. If one wishes to prepare his own 

 spray material, the best insecticide for scale when the 

 plant is in the dormant season is the lime-sulphur wash, 

 prepared as follows : 



Lime 8 pounds. 



Sulphur 16 pounds. 



Water 10 gallons. 



Boil together for about forty minutes, then dilute one 

 gallon of the mixture with ten of water. The solution 

 is now ready for the spray pump. 



Practical Exercises 

 1. Spraying for Scale 



It may not seem possible for the school to do the prac- 

 tical work suggested in this exercise, but every effort 

 should be made to make it possible. 



If any farmer in the neighborhood has a spray pump, 

 ask him to loan it for use at the school. He may have 

 a gallon of ready-mixed lime-sulphur solution which he 

 would let you have. Dilute the gallon to about ten or 

 twelve gallons with water, place in the spray pump, and 

 spray a few trees in the vicinity of the school. Make a 

 notebook record of this lesson. 



2. Spraying House-plants against Lice 

 The following mixture is often used for scale and 

 plant lice when the foliage is on the trees, or it may 

 be used to rid house plants of the plant lice or scale : 



Hard soap 1 oz. 



Water 1 pt. 



Kerosene 2 pts. 



