xii 



PLANT DISEASES 



PAGE 



Phytophthora infestans . . 63 



Phytophthora omnivora . 67 



Plasmodiophora brassicae . 335 



Plowrightia morbosa . . 137 



Plasmopara viticola . . 9, 71 



Polyporus betulinus . . 190 



Polyporus hispidus . . 192 



Polyporus sulphureus . . 195 



Polystigma rubrum . . 135 



Poria vaporaria . . .181 



Pseudopeziza trifolii . . 144 



Puccinia asparagi . . . 240 



Puccinia graminis . . 12, 248 



Puccinia pringsheimiana . 243 



Puccinia pruni . . . 251 



Pythium de baryanum . . 55 

 Rhizopus necans ... 58 



Rhytisma acerinum . . 143 



PAGE 



Rosellinia necatrix . . .119 



Rosellinia radiciperda . .116 



Sclerotinia fuckeliana . -149 



Sclerotinia sclerotiorum . . 151 



Sclerotinia urnula . . -154 



Sphaerella fragrariae . . 108 



Stereum frustulosum . . 173 



Stereum hirsutum . . . 175 

 Taphrina bullata ... 90 



Tilletia tritici . . . .219 

 Uncinula spiralis ... 93 



Urocystis colchici . . . 224 



Urocystis occulta . . . 222 



Uromyces betae . . . 229 



Uromyces colchici . . . 227 



Ustilago avenae . . .211 



Ustilago hordei . . .215 



Vermicularia circinans . . 274 



