206 SCHOOL AND HOME GARDENS 



The standard Bordeaux mixture may be used success- 

 fully on plants whose leaves are not easily injured. It 

 hurts the foliage of peach trees and may also discolor 

 the fruits of apple or pear trees. The strength may be 

 decreased or increased as desired. 



The 5-5-50 formula is copper sulfate, five pounds ; 

 lime, five pounds ; water, fifty gallons. By reducing the 

 quantity of copper sulfate and increasing the lime, the 

 danger of scorching may be lessened. 



Peach Bordeaux mixture, or the 3-9-50 formula, is 

 copper sulfate, three pounds ; lime, nine pounds ; water, 

 fifty pounds. This formula is used extensively for 

 spraying peach trees, and is not likely to injure the 

 foliage. 



Bordeaux mixture and insecticide. To fifty gallons of 

 Bordeaux mixture add four ounces of Paris green or 

 three pounds of lead arsenate. 



Potassium sulfide. Use one ounce of potassium sul- 

 fide in three gallons of water. This does not discolor the 

 leaves. It is especially effective in preventing mildews 

 and rusts. 



Sulfur. Flowers of sulfur is used to prevent mildews, 

 such as that of the rose. Dust the powder over the 

 plants when they are damp. 



Formalin. Formalin is used very extensively for pre- 

 venting scab on seed potatoes. Use one ounce of 

 formalin to two gallons of water. 



