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Preservation of Diseased Specimens and Pathogens
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Aeciospores agar Agric American elm Amherst Armillaria asci ascospores asexual bacteria Basidiomycetes basidiospores branches callus canker caused cells cleistothecia conidia courtesy of Shade cover glass Cronartium culture dead decay dieback discoloration Disease cycle Durham Dutch elm disease ectomycorrhizae Etiology fruiting body fruiting structures fungal fungi fungus gall growth Hampshire healthy host tissues hyphae infected trees injury inoculation inoculum invade karyogamy killed leaves lens lesions maple microorganisms microscope slide prepared mistletoe mycelium mycorrhizae Nectria nematodes nutrient organism parasitic pathogen penetrate perithecia petri dishes phloem Photograph courtesy Phytopathology plant powdery mildew Primary causal agent Procedures produce Pycnia pycnidia root system rust sample saprophyte seedlings Selected References sexual Shade Tree Laboratories soil species specimen spores sporodochia spring stem sterile susceptible Symptomatology symptoms teliospores tree diseases tube twigs ulmi University of Massachusetts urediospores USDA Forest Service usually Verticillium virus wilt windblown wounds xylem yellow