ijljl STATE BOARD OF AGRICULTURE. 



FORMULAS. 



BORDEAUX MIXTURE. 



Copper Sulphate 2 to 4 pounds 



Fresh Lime (unslaked) 4 to 6 pounds 



Water 50 gallons 



Care should be taken that the lime is of good quality and well burned 

 and that it has not become air-slaked. If only a small amount is to 

 be slaked it will be best to use boiling water, and the lime should 

 not be allowed to become dry while slaking. When much Bordeaux 

 is to be prepared, it is a good plan to make up stock solutions which 

 can be mixed as required, x>roceeding as follows: Dissolve 40 pounds 

 of copper sulphate in 40 gallons of water and in a box slake 60 or more 

 pounds of lime. These can be kept for some time, but it is best not to 

 prepare more than can be used in a week or ten days. Each gallon 

 of the solution will contain one pound of the copper sulphate, and in 

 preparing it for spraying, as many gallons should be used as are neces- 

 sary to furnish the proper amount of copper sulphate. Thus for eacli 

 50 gallons required, 2 to 4 gallons of the solution should be placed in 

 a barrel in which there are 20 gallons of water. An equal weight of 

 lime, as near as can be estimated, should be placed in another barrel 

 and 20 gallons of water added to this. After being well stirred, the 

 lime mixture should be allowed to stand for a minute to give the coarse 

 particles time to settle, and then the lime-water should be dipped out 

 and slowly poured into the copper sulphate solution, stirring rapidly 

 as the lime water is poured in. The mixture is then ready for use, but 

 as there is danger of burning tender foliage if the amount of lime is 

 insufficient, it is well to use some simple test, such as dipping a knife 

 blade in the mixture, or adding a few drops of ferro-cyanide of potassium 

 (yellow prussiate of potash). If the amount of lime is not sufficient 

 copper will be deposited upon the knife blade, while the ferro-cyanide 

 of potassium will give the mixture a deep brownish-red color. More 

 lime should be added if necessary until no discoloration is caused in 

 either case. An excess of lime will do no harm and is always desir- 

 able. 



The copper sulphate can be easily dissolved, if suspended in the water 

 in a coarse sack or basket. If the lime is properly slaked and is handled 

 as recommended, there will be little trouble from lumps, but it is always 

 well to strain the lime-water through a sieve, such as a piece of window 

 screening. 



This is the best remedy for fungous diseases except while the trees 

 are dormant, or as the fruit is ripening. It is especially valuable for 

 use with Paris green and other arsenites, as ft lessens the danger of 

 their injuring the foliage and the washing effect of rains. 



DUST SPRAYS. 



Attempts have been made to use copper sulphate and Paris green 

 as dust sprays. Very unsatisfactory results have been secured when 

 the dust sprays are used as fungicides but ihoy answer fairly well 

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