[NDEX. 85 



Walnut, black, red heart-rot, susceptibility 



white heart-rot, Busceptibility 



white. See Butternut. 



rot, susceptibility 



Water, ground, cause of disease in certain trees 1 :; 



Waugh, F. A., reference to work 



Weathering of timber as cause of decay 



White heart-rot. See Rot, heart, white. 

 oak. See Oak, white, 

 pine. See Pine, white, 

 rot. See Rot, white. 



Willow, heart-rot, susceptibility 42 



leaf-rust injury to osier willow plantations : 1!) 



mildew injury L8 



sap-rot, occurrence 57 



white heart-rot, susceptibility : 26 



rot, susceptibility 



Wind, injuries to trees 11 



Witches' broom formed by mistletoe, injuries to trees L6 17 



Wood, preservation by chemicals to prevent decay I 



rotting fungi, description, progress of decay 5J 



structure, effect of Fomes igniarius 



Wound fungi causing diseases of forest trees - 



parasites 



Wounds, tree, importance as causes of disease 1 1. - 1. 



protection to prevent fungous growth 



149 



O 



