Minnesota Plant Diseases. 



421 



Poplars, 



powdery mildew of, 121, 125, 272 

 red knot on, 134 



Pore fungi (Fig. 85), 



175, 176, 177, 178 



birch fungus (Fig. 126), 254, 255 

 creeping wood rot of, 258 



currant rot, 320 



dry rot fungus, 245, 247 to 250 

 earth-dwelling habit, 39 



false tinder fungus, 250 



flattened, rot (Fig. 123), 



251,252 



fruiting bodies, 23 



hairy pore fungus, 259 



oak Dsedalea, 257 



zoned pore fungus, 258 



on ground (Fig. 85), 176 



on stems, 64 



parchment, on larch (Fig. 



36), 8 1, 258 



pitch-stemmed, 259 



ring-scale of pine, 256 



root-rot of currant (Fig. 



163), 321 



scaly (Fig. 125), 254 



sulphur fungus (Fig. 124) 



252, 253 

 timber rots and wound 



parasites, 235 



tinder fungus, 251 



trametes radiciperda, 256 



undetermined (Fig. 127), 257 

 wound parasites, 47 



Portulaca, white rust of, 112 



Potash of lime, in resin 

 bordeaux, 218 



Potassium permanganate, 221 



Potassium sulphide, 220, 221, 357 

 for brown rot of plums, 358 

 for carnation rust, 373 



for downy mildew of onion, 



334 



for mildew of chrysanthe- 

 mum, 380 



for powdery mildew of 



gooseberry, 325 



for powdery mildew of 



rose, 379 



for powdery mildew of 



vines, 366 



Potato disease, losses by, 202 



Potato blight (Fig. 39), 



80, 99, no, in, 112 

 destroyer of leaves, 80 



destructive effect, 78 



distribution of spores, 27 



epidemics, 100 



spores of (Fig 44), 109 



Potato, damping-off of seed- 

 lings, 382 

 downy mildew of (Figs. 166, 

 167), 331, 332, 333 



early blight of, 

 fungus stimulation of 



tubers, 



scab (Fig. 164), 

 scab, corrosive sublimate 



treatment, 



scab formalin treatment, 

 starch, converted to sugar, 

 sterile-fungus rot of, 

 wet rot of (Fig. 172) 

 Powder guns (Fig. 115), 

 Powders, dry bordeaux, 

 for dusting plants, 

 sulphur, 



sulphur and lime, 

 Powdery mildew (Figs. 50, 



52), 



degree of parasitism, 

 fruiting bodies, 

 kinds of spores, 

 of apple, 



329 



50 

 326 



231, 



226 

 223 

 114 

 329 

 340 

 232 

 227 

 227 

 227 

 227 



51, 



80. 124, 125 



58 

 23 

 25 

 361 



of chrysanthemums, 379, 380 

 of composites (Fig. 210), 



396, 397 



of cucumbers, 324, 325 



of elms (Fig. 135), 274 



of gooseberry, 325 



of grasses (Fig. 152), 304 



of hazel, 395 



of hops, 325 



of lilac, 377 



of mints, 397 



of plums and cherries (Fig. 



192), 360, 361 



of rose (Figs. 203, 204), 378, 379 

 of strawberry, 324 



of vines, 366, 367 



of vetch and crowfoot, 395, 396 

 of willow (Fig. 134), 272, 273 

 on limited areas, 79 



spores of, 118 



