48 

 FUNGICIDES. 



BORDEAUX MIXTURE. 



Formula. 4 lbs. Copper Sulphate, {Blue Vitriol). 

 4 lbs. Caustic Lime (Unslaked Lime). 



Dissolve the copper iu hot water. (If suspended in a basket or 

 sack in a tub of cold water it will however dissolve in from two to 

 three hours.) 



The lime is then slaked in another vessel adding water slowly that 

 it may be thoroughly slaked. When both are cool, pour together, 

 straining the lime through a fine mesh sieve or burlap strainer, and 

 thoroughly mix. Before using, add water enough to make 50 gal- 

 lons of the mixture. 



The active agent iu this mixture is the copper, the lime being used 

 simply to hold it iu place upon the foliage and branches of the plants 

 sprayed. Here it is given up gradually, destroying the spoi'es of the 

 fungi as they are brought iu contact with it by the surrounding 

 atmosphere. 



Should the lime be air slaked at all more than four pounds may be 

 needed as it will have lost much of its strength. 



This fungicide is recommended as more satisfactory than any 

 other, from the fact that it adheres a long time to the branches, buds 

 and leaves and seldom causes any injury to the foliage. 



It has been found more effectual if made up fresh for each appli- 

 cation. Two or three thorough applications give better results 

 than many light ones. 



When both fungous growths and insects attack a crop, Paris green 

 should be applied with the Bordeaux, as in a combined state both 

 are as effective as if used singl}', one-half of the labor is saved and 

 there is less danger from injury to the foliage by the Paris green than 

 if used alone. 



DILUTE COPPER SULPHATE SOLUTION. 



After the fruit has nearly matured it is often disfigured by the 

 adhesion of the Bordeaux mixture, and in place of the Ammoniacal 

 carbonate of copper recommended in Bulletin No. 37, we would 

 advise the use of copper sulphate 2 oz. to 50 gallons of water. The 

 foliage of many plants will stand a much stronger solution, but this 

 is as concentrated as can be generally used. 



DRY BORDEAUX MIXTURE. 



Several samples of the dry Bordeaux mixture were sent to the 

 Station for trial and some brands purchased, all of which were given 

 a careful trial with the following results : 



a. That in the dry powdered form it is difficult to distribute over 

 the leaves without great loss. 



h. That it does not adhere well to the leaves even when they have 

 been wet with dew or rain. 



c. That the first heavy rain washes all off. 



d. That little or no beneficial results attended its use. 



