204 



Bulletin 236. 



Practically all of them seem to have been formed during the seasons of 

 1902 and 1903. The summer of 1902 was a very rainy one in those 

 regions, ofifering the very best of conditions for infection and develop- 

 ment of the cankers. No doubt many of them appeared during that time 

 but passed unnoticed by the ordinary grower until their baneful effects 

 began to show in 1903. A few active cankers, however, were noted on 

 trees here and there in these badly diseased orchards. The force of the 



H 



N N . 



-v 



J 



Fig. 82. — ]\lap shoiving localities in the State where the disease is known to have been 

 epidemic. The disease probably occurs throughout tlu? orchards of the State, but 

 is seldom severe. 



epidemic seems to have spent itself by the end of 1903, the completion of 

 the destruction being effected by the rot fungi that had gained entrance 

 to the heartwood through the canker wounds. 



In Jefferson county along the eastern end of Lake Ontario, especially 

 in the neighborhood of Chaumont, the disease had completely wiped out 

 many of the young orchards even before 1903. Farmers in this district 

 assured me that their trees had been dying from this disease of trunks 



