16 FUNGI AND FUNGICIDES 



of water, or as much as may be necessary for the pur- 

 pose. In a tub or half barrel slake four pounds of fresh 

 lime. When completely slaked add enough water to 

 make a creamy whitewash. Pour this slowly into the 

 barrel containing the copper sulphate solution, using a 

 coarse gunny sack stretched over the head of the barrel 

 for a strainer. Finally fill the barrel with water, stir 

 thoroughly, and the mixture is ready for use. Prepared 

 in this way the cost of one gallon of the mixture will 

 not exceed one cent, the price of copper sulphate being 

 seven cents per pound, and lime thirty cents per bushel. 

 In all cases it is desirable to use powdered copper sul- 

 phate, as it costs but little more and dissolves much 

 more readily. It is highly important also that fresh 

 lime be used." 



Third-strength Formula. In 1891 Mr. AV. J. 

 Green, of the Ohio Experiment Station, used on apples, 

 plums, pears, cherries, raspberries, etc,, a still more 

 dilute mixture, viz., four pounds of copper sulphate and 

 four pounds of lime to fifty gallons of water, and ob- 

 tained very good results. The cost of the copper sul- 

 phate in a barrel of this mixture is less than one-third 

 the cost of that in a barrel prepared according to the 

 original formula. 



A still more dilute mixture is recommended by the 

 Rural New Yorker, and probably, in some cases, is as 

 effective as any of the above, while also cheaper. It is 

 "one ounce of copper sulphate and three-fourths of an 

 ounce of lime to each gallon of water ; that is to say, 

 two pounds of copper sulphate and one and one-half 

 pounds of lime to thirty-two gallons of water." A 

 special advantage of the Bordeaux mixture is, that Lon- 

 don purple or Paris green can be added to it, making a 

 combined insecticide and fungicide. 



Care should be taken not to use the Bordeaux mix- 

 ture on fruit crops too late in the season. Traces of it 



