Insects, Diseases and Frost 269 



tank and placed on a two- wheeled cart. At the rear of 

 the rig a hollow rod is attached, to which are fastened 

 three to five nozzles at the correct intervals to cover as 

 many rows. The rod is connected with the barrel by a 

 spray hose. It is preferable to use two horses, so as to 

 straddle the rows. For larger operations, an outfit of the 

 same type, but deriving power from sprocket wheels, is 

 more effective, as the spraying is done without stopping 

 the team (Plate XXIII). Compressed air knapsack 

 sprayers are serviceable for home gardens. 



Preparation of spray materials. 



Bordeaux mixture is preferred for controlling fungous 

 diseases of the strawberry, although concentrated lime- 

 sulfur solution, diluted at the rate of one and one-half 

 gallons of a solution testing thirty-three degrees Beaume 

 to fifty gallons of water, has given good results in some 

 places. Bordeaux is made by slaking four pounds of 

 quicklime slowly, preferably with hot water, and diluting 

 it to make twenty-five gallons. Dissolve three pounds 

 of bluestone (copper sulfate) in twenty-five gallons of 

 water. This may be done quickly with hot water, or the 

 bluestone may be placed in a burlap sack the night before 

 the spray is to be applied and hung in a tub of water, so 

 that the bottom of the sack is just below the surface of 

 the water. Always use a wooden receptacle for dissolving 

 bluestone. When ready to spray — not before — pour 

 the lime and the bluestone solutions together into a fifty 

 gallon barrel at the same time ; do not pour one into the 

 other. Strain the mixture through fine wire gauze before 

 spraying, and keep it agitated. 



Arsenate of lead paste is preferred to paris green for 

 spraying strawberries, as it sticks better to the foliage. 



