SPRAY MATERIALS 133 



This formula is for the home-made wash. Slake the lime 

 in a small quantity of water. Gradually stir the sulphur 

 into this mixture. Dilute the mixture to 12 gallons and boil 

 for one hour or longer. Remove from the fire and add enough 

 water to make 50 gallons. Strain the wash through a fine- 

 mesh strainer. This spray must be used when the plants are 

 dormant, and it is either applied in the spring before the buds 

 open or in the fall after the leaves drop. The chief disad- 

 vantage of this home-made wash is the great quantity of 

 sediment which is hard to remove satisfactorily so that it 

 will not clog up the pump and nozzles. 



COMMERCIAL LIME-SULPHUR SOLUTION. 



The commercial lime-sulphur is much easier to use because 

 it is free from sediment and requires no preparation other 

 than to dilute it with water. The commercial solutions are 

 thoroughly reliable. They are fairly well standardized now 

 and the standard liquid test is about 33 degrees on the 

 Baume hydrometer, which is the density of the solution. 

 These solutions when used as insecticides must be diluted and 

 sprayed on the plants when they are in a dormant state. 

 When the solution tests 33 degrees Baume, one gallon of 

 the mixture should be diluted with 7 or 8 gallons of water. 

 Solutions less dense should be diluted as follows: 



TABLE OP DILUTIONS FOR THE DORMANT SPRAY. 



Number of gallons 

 of water to one 

 Reading on gallon of the lime- 



hydrometer, sulphur solution 



degree Baum6. for dormant spray. 



33 . . . 7 



32 6J 



31 6 



30 5^ 



29 . . 5J 



28 . 6 



27 45 



26 H 



25 41 



24 4 



23 4 



22 3J 



21 31 



20 . . 3 



