FUNGICIDES 



425 



out the mass of grain, destroying the adults, larvae and pupae. 

 Keep all fire or flames away from the materials. Use one teaspoon- 

 ful of the liquid to each two cubic feet of tightly closed air space. 



FUNGICIDES 



Bordeaux mixture is the most common fungicide used to pre- 

 vent disease of plants. The most common formula is five pounds 

 copper sulfate (blue stone), and five pounds fresh burned lime to 

 50 gallons of water. Dissolve the copper sulfate at the rate of one 



FIG. 294. Bordeaux mixture is made by makine the two stock solutions separately and 

 then pouring the two together as shown. (U. S. D. A.) 



pound to one gallon of water. This may be done by hanging it 

 in a bag suspended in the water over night, or by boiling the water 

 for a few minutes. Slake the lime carefully until it is of a creamy 

 consistency. Add water to make one gallon per pound of lime. 

 These two solutions may be kept any length of time, and are called 

 stock solutions. When needed for spray, stir each mixture well; 

 dilute each as much as convenient before pouring them together. 

 To mix them, pour the two diluted solutions at the same time into 

 a third vessel (Fig. 294), then more water may be added to agree 

 with the formula here given. Strain the Bordeaux mixture through 

 cheesecloth before spraying. 



