Diseases and Pests of the Apple and Their Control 247 



of lead and is highly recommended in combination with 

 Bordeaux. The other spreaders named, glue and flour 

 paste, are being used with arsenicals, but their status has 

 not yet been definitely determined. It is thought that 

 they may increase the spreading tendencies and effect a- 

 more uniform' coating of these arsenic stomach poisons. 



FUNGICIDES 



i 

 IAme-sulfur has been treated on the preceding pages, as 



it is both an insecticide and fungicide. 



Bordeaux mixture. — The standard formula for Bor- 

 deaux mixture is as follows: 



Copper sulfate (bluestone) 4 pounds , 



Fresh stone lime 4 pounds 



Water 50 gallons 



Dissolve the bluestone and slake the lime separately with 

 water. Bluestone may be conveniently dissolved by plac- 

 ing it in a burlap sack and suspending the sack in the upper 

 part of a barrel or other receptacle filled with water. 

 Stock solutions of this material may be made by dissolving 

 1 pound bluestone in 1 gallon of water and diluting to the 

 required strength when ready for use. It is not advisable 

 to make up in advance large amounts of this solution that 

 cannot be used within a period of a few days. Nothing 

 but wooden or earthen containers should be employed 

 since copper sulfate (bluestone) reacts when brought in 

 contact with metal ware of any kind. In slaking the lime, 

 cover with just enough water to start slaking, then add 

 water to prevent too rapid action and heating. Work the 

 lime into a paste and dilute at the rate of 1 pound of lime 



