132 



SOILS AND PLANT LIFE 



The dreaded black rot of the grape can be controlled 

 if Bordeaux mixture is applied when the buds are just 

 swelling, again when they unfold, and two or three times 

 after this at intervals of about two weeks. 



The most effective means we have of preventing the 



Fig. 4G. — The apple scab. 



germination and growth of spores is the Bordeaux mixture. 

 It should not be applied during rainy weather ; and for 

 stone fruits, such as the cherry, peach and plum, it should 

 be used in only half strength. 



By the addition of three pounds of arsenate of lead to 

 fifty gallons of Bordeaux mixture, both biting insects and 

 diseases can be controlled. 



