220 



Minnesota Plant Diseases. 



on standing." [Mass. Bull. No. 80 — 1902.] Only the clear 

 blue fluid should be used. This solution is recommended 

 only when the staining of the foliage and fruits by bordeaux 

 is objectionable, e. g., in fruits nearing maturity and on green- 

 house plants. It has been recom- 

 mended for fungus parasites as the 

 powdery mildews which possess a 

 conspicuous and superficial mycelium. 

 A solution of copper carbonate (one 

 pound to forty gallons of water) with- 

 out ammonia has also been recom- 

 mended for fruit rots. 

 Copper acetate. 

 Copper acetate (diba- 

 sic acetate) 6 oz. 



Water 50 gals. 



First make a paste of the copper 

 acetate, by adding water to it, then 

 dilute to the required strengh'. Use 

 finely powdered acetate of copper, not 

 the crystalline form. [Mass. Bull. 



Fig. 108.— A powerful horizontal ■' t t> t l 



type of spray pump for or- No. 8o — 1902]. May be uscd as a 

 Snfg. coo'"'"''' '^°""" substitute for the copper carbonate 

 mixtures. 



Saccharate of copper. 



"Copper sulphate 4 pounds. 



Lime 4 pounds. 



Molasses 4 pints. 



Water 25 gallons. 



Slake four pounds of lime and dilute the same with water. 

 Dissolve four pints of molasses in a gallon of water and mix 

 with the lime. Stir thoroughly and let it stand a few hours. 

 Dissolve four pounds copper sulphate in ten gallons of water 

 and pour into it the lime-molasses solution while stirring brisk- 

 ly. Allow the mixture to settle. Draw off the clear greenish 

 solution for use." [Mass. Bull. No. 80 — 1902.] 

 Potassium sulphide. 



"Water 10 gallons. 



Potassium sulphide 3 oz." 



[Mass. Bull. No. 80—1902.] 



