230 



POTATOES 



Arsenate of lead is commonly put up in paste form so that it 

 will more readily mix with water. Two or three pounds of this 

 poison may be mixed with fifty gallons of water for spraying 

 potatoes. 



FIG. 164. Potato harvest where large areas are grown for market. The machine 

 digger leaves the tubers in rows on the top of the soil. They are then picked in boxes or 

 barrels to be hauled to market or storage. (U. S. D. A.) 



In regions where late potato blight is likely to be injurious to 

 the crop the damage may be prevented by the use of either Bor- 

 deaux mixture of lime-sulfur with either of these poisons. For 



FIG. 165.- This simple potato digger has several tines instead of a moldboard, allowing the 

 soil to fall through but keeping the potatoes on top. (New Jersey Station.) 



this purpose the amount of water mentioned above may be re- 

 placed with the same amount of Bordeaux mixture or lime-sulfur 

 mixture. The formula for Bordeaux mixture to be used on pota- 

 toes is five pounds of copper sulfate and five to six pounds of freshly 



