DISEASES OF SPECIAL CROPS 



71 



from the tree, covering the ground beneath, while apples 

 less advanced in disease still hang upon the limbs. 



Fig. 23. — Bitter rot canker formed where a limb was broken. After Burrill. 



This same disease affects twigs and young branches, 

 causing cankers or rough spots on the bark, which (Figs. 23, 



