98 



DISEASES OF ECONOMIC PLANTS 



Wound infections and wood rot. — See general discussion 

 of the subject, p. 410. 



Wood rot {Schizophyllum commune Fr.). — Decay of the 

 roots and lower trunk occur here much as in cherry. 



F'iG. 40. — Unsprayed apple trees. After Scott and Rorer. 



The causal fungus seems to enter through wounds in the 

 bark or roots. Later the characteristic sporophores are 

 produced. See page 120. 



Clitocybose, root rot (Clitocyhe parasitica Wilcox). — 

 This root rot, very similar to that caused by Armillaria 

 mellea, p. 173, was described by Wilcox in Oklahoma 

 in 1901 ^ as characterized chiefly by a copious exudation 

 of gum from the crown of the diseased trees. The leaves 



1 Wilcox, E. Mead, Okla. Agr. Exp. Sta. Bui. 49. 



