432 



Minnesota Plant Diseases 



Willow, 



powdery mildew of (Fig. 



52), I2S, 126 



rusts, 160 



tar spots (Fig. 133), 142, ^70 



Wilt of cucurbits (Fig. 173), 341 



of flax (Figs. 15-6, 157, IS8, 

 159), 310 to 314 



Wind, assistance in infection, 98 

 spore distribution in puff- 

 balls, 182 



Wine, bacteria in, 196 



Witches'-broom (Fig. 22), 51, 52 

 age of mycelium, 20 



caused by insects, 56 



caused by leaf curl fungi, 121 

 of rust origin, 164 



on balsam fir (Fig. 



23), 153. 277, S7& 



on birch, 56, 271 



on cherry, 56, i6j 



on red cedar (Figs. 26, 



57), 54- 55 



on spruce (Fig. lOl), 199,200 

 on white spruce (Figs. 24, 



25, 55), 54 



stunting in age, 82 



Witches' butter, a trembling 



fungus, l6g 



Wood, attacked by fungi, 40 



basidium bearing fungi on, 154 

 bird's-nest fungi on, 186 



characters of, 85' 



dead, cup fungi on, 142 



-destroying fungi, action on 



hgnin (Fig. 38), 85,86 



-dwelling fungi, action on 



wood, 40 



-dwelling fungi, methods of 



entrance, 40 



-dwelling fungi, nutrition, 40 

 -dwelling habit, 40 



gill fungi on, 179 



Jew's-ear fungi on, 166 



palisade fungi on, 171 



-peckers, agents of spore 



distribution, 31 



-peckers, wounds caused by, 47 

 rot, coral fungus (Fig. 119), 



244, 246 

 rot, destruction of wood 

 (Fig. 38), 86 



Wood, 



rot, creeping pore fungus, 258 



rot, partridge (Fig. 118), 242 

 rot (see also timber rots), 



rot, Stereum (Fig. 117), 240 



sphere throwing fungi on, 184 



tissues, 85 



tooth fungi on, I75 



trembling fungi on, 167 



Worms, degeneration in, 10 



true, parasites of, 67 

 Wound infection and prevention 

 of disease, 204, 205 

 parasites (Fig. 20), 



45, 46, 80, 235 

 parasites, birch fungtis, 255 

 parasites, degree of para- 

 sites, 58 

 parasites, destroyers of 



branches, 80 

 parasites, false tinder fun- 

 gus, 250 

 parasites, gill fungi, I79 

 parasites, ring scale of pine, 256 

 parasites, scaly pore fungus, 254 

 parasites, Stereum (Fig. 



117), 241 

 parasites, sulphur fungus, 253 

 parasites, tinder fungus, 251 

 Wounds, cause of, 47 

 causes of predisposition, 96 

 in bark, entrance of rots, 41 

 in bark, causes, 41 

 Yeast-like fungi on animals, 66 

 on man, 75 

 on water flea, 67 

 Yeasts (Fig. 48), 118, 119, 120 

 allies of, 120 

 fermentation, 36 

 habit of saprophytes. 36 

 in bread making, 119 

 in slime exudation, 120 

 in slime flux, 271 

 occurrence in nature, 36 

 power of fermentation, 119 

 Yellow piped oak, 240 

 Youth, predisposition of, 95 

 relation to disease, 91 

 Zinc chloride, to prevent tim- 

 ber rot, 239 

 Zoned Polyporus rot, 258 

 Zoosjloea, 190 



