TREATMENT FOE BLOTCH AND OTHER DISEASES. 23 



varieties alike. For example, the Winesap, which scabs badly but 

 is not susceptible to bitter-rot and blotch, should be given the first 

 three applications, but need be sprayed thereafter only for the codling 

 moth, using the arsenical alone. On the other hand, in the treatment 

 of the Ben Davis, which does not scab in the South but is very sus- 

 ceptible to apple blotch and sometimes rots badhy, the first applica- 

 tion may be omitted except in restricted localities where the spring 

 canker worm is a pest ; and in the second application the formula may 

 be reduced to 2 or 3 pounds of bluestone and 3 or 4 pounds of lime to 

 50 gallons of water in order to reduce the Bordeaux injury as much 

 as possible. 



144 



