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Reading-Course for Farmers. 



The Nezv York Apple Tree Canker. — This is a common canker 

 disease in Western New York. Examine the main limbs of your apple 

 trees, especially on the upper side. If they have large, black roughened 



areas like that shown in Fig. 

 364, you may be quite sure 

 it is this disease. Twenty 

 Ounce, Baldwin, Wagener, 

 Greening and King trees suf- 

 fer most from this Canker. 

 This is a fungus disease. You 

 can often make out the little 

 pimples or fruit bodies of the 

 lungus scattered over the sur- 

 face of young cankers. (Fig. 

 365.) The spores are scat- 

 tered from these cankers to 

 leaves and sometimes to fruit 

 causing what is known as 

 " black rot." If the limbs are 

 badly affected it may be nec- 

 essary to cut them out en- 

 tirely. If the cankers are 

 small they may be removed 

 by cutting well back into the 

 healthy bark and scraping out 

 the diseased tissue. Wash 

 the wound with a solution of 

 corrosive sublimate, one part 

 to one thousand of water, and 

 paint over with a heavy lead 

 paint. Thoroughly sprayed 

 orchards suffer very little 

 from this disease and espe- 

 cially where an effort is made 

 to coat the limbs at the time 

 when the first application of 

 Bordeaux is made for the 

 apple scab, about the time the 

 leaf buds begin to open. If 

 these cankers are abundant it 

 will be well after pruning and 



Fig. ^6s.-Blight Canker developing about cutting them out to spray the 

 base of blighted twig on Greening tree. trees with a Strong solution of 



