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THE CAUSAL ORGANISM
LIFE HISTORY IN RELATION TO PATSOGENEsisVr
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adjusted to pH Aerobiology asci ascospore discharge ascus balsam poplar Bier branch and trunk bruised cambium canker on poplar canker was found cankered trees causal organism cent malt agar Christensen 1937 conidia were produced conidial detachment conidial stroma conidiophores correlated County diameter growth Erlenmeyer flasks Forest free water grandidentata Greased glass slides growing sites hyphal pegs Hypoxylon canker Hypoxylon Holwayii Hypoxylon pruinatum incidence Incubation infected with Hypoxylon inoculation studies Insect borer holes Kaufert Klotzsch l/lO acre leaf axils Lorenz and Christensen mass inoculum mycelial culture mycelium Number Per cent open f covered overwintered PATHOGENESIS ON POPLAR perfect stage perithecial stromata petioles Petri dishes Phytopath plots previously described pruinata pruinatum was studied relative humidity replications Richard Hamilton Riker Saskatchewan shown in figure species of Hypoxylon Sphaeria spore discharge spores per sq thesis tremuloides Trunk tissue University of Wisconsin Vilas County water was necessary water-agar Waushara Counties wood wounds