Development of gums and tyloses 13 Possible Bases for Host Resistance Production of phenolic compounds Growth of tyloses Xylem anatomy 2? MATERIAI2 AND METHODS 29 Host Material Used in the Study 29 Inoculum Inoculation and Sampling Test for the Presence of Lignin 39 Light and Electron Microscopy RESULTS AND OBSERVATIONS Deterioration of Host Tissue Formation of Tyloses Discoloration of Xylem Tissue 4? Observational Differences between Elm Species 48
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