194 



Bulletin 236 



Fig. 67. — Growing twig of apple blighted by 

 artificial inoculalion ivitli bacteria from 

 active canker on limb of apple tree. 



Fig. 66. — Canker on pear tree result- 

 ing from inoculation iviih bacteria 

 from active canker on apple tree. 



Fig. 68. — Blossom and spur blight of 

 apple resulting from artificial ino:u- 

 lation with bacteria from canker on 

 limb of apple tree. Note the small 

 cankers that have formed about the 

 base of the spurs. * 



