420 



Minnesota Plant Diseases. 



Pholiota, 



squarrosa, 263 



Phosphorescence, bacterial, 194 



Phragmidium speciosum, 375, 376 

 subcorticuim (Figs. 199, 200, 



201), 373 



Phycomycetes, 104 



Phyllachora trifolii (Fig. 153), 305 

 Phyllactinia suffulta, 395 



Phyllosticta violae, 381, 382 



Physiology of mycelium, 17 



Phytophthora infestans (Figs. 



44, 1 66, 167), 109, 331, 332, 333 



omnivora (Fig. 44), 109,382 



phaseoli, 336, 337 



Pigeon grass smut, 394 



Pig-weed, white rust of, 112 



Piling of timber, 238 



Pilobolus (Figs. 16, 17), 37, 38 



Pin worms, parasites of, 66 



Pine board, attacked by dry rot 



(Figs. 121, 122), 248, 249 



Pine knot (Fig. 136), 56,82,275,276 



Pine Lenzites, 266 



Pine stem rust (Fig. 136), 275,276 



Pines, needle cast of, 138 



ring scale of, 256 



rust of leaves, 276, 277 



rusts of wilkweeds and 



Pyrola, 386 



stimulation in rusts of, 164 



witches'-broom on (Fig. 



22), 52 



Pink family, rust of balsam fir, 278 

 smut of, 371,393 



smut on anthers, 65 



stimulation of floral rudi- 

 ments, 83 

 stimulation of smuts in, 158 

 Pipe tongs, for spray apparatus 



(Fig. in), 228 



Pitch-stemmed pore fungus rot, 259 



Plant diseases, 



lice, molds on, 

 parasites of, 

 parasites, 

 partnerships, 



90 



116 



68 



77 

 48,49 



Plantain, powdery mildew of, 124 

 Plasmodiophora brassicae (Figs. 



179, 1 80), 345, 346 



Plasmodium of slime mold 



(Fig. 100), 197 



Plasmopara cubensis (Figs 168 

 to 171), 334, 335, 336, 338 



viticola (Figs. 196, 197, 



198), 368,369,370 



Pleurotus ostreatus, 266 



rot of elm, 265, 266 



sapidus (Fig. 131), 265,266 



ulmarius (Fig. 20), 46,265,266 



Pliers for spray apparatus (Fig. 



in), 228 



Plowrightia morbosa (Figs. 59, 



191-), I35,358,359<3fo 



Plug for spray apparatus (Fig. 



in), 228 



Plums, black knot of (Fig. 59), 



135, 136, 358, 359, 36o 

 brown rot of, 152, 357, 358 



leaf rust of, 350, 351 



pockets (Figs. 49, 193), 



120, 121, 361, 362 



pockets, oak leaf blisters, 272 

 powdery mildew of (Fig. 



192), 360, 361 



scab of, 363 



stunting by pocket fungi, 82 



witches'-brooms on, 121 



Pockets, of plum and cherry 



(Figs. 49, 193), 82, 120, 121, 361, 362 



Podosph^era leucotricha, 361 



tridactyla (Fig. 192), 360, 361 



Poisoning by ergot, 309 



Poisonous gill fungi, 179, 186 



pore fungi, 178 



Poisons, corrosive sublimate, 226 



in ergot, 129 



smuts of grasses, 295 



use in methods of cure, 209 



Poles, rot of, 239 



Pollen, replaced by smut, 158 



Polyporaceae (see pore fungi). 



Polyporus betulinus (Fig. 126), 



254, 255 



picipes, 259 



rot, zoned, 258 



squamosus (Fig. 125), 254 



sulphureus (Fig. 124), 252,253 



Polystictus hirsutus, 259 



pergamenus (Fig. 36), 81, 258 



versicolor, 258 



Pond scums, 9 



Poplar rusts (Fig. 137), 160, 278, 279 



Poplars, leaf and fungi on, 121 



