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An atypical variable wild form of Botrytis allii
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20 days 5-per cent level abundance antibiotic appeared atypical wild B-chloroethyl black mold black sclerotia Botrytis allii Botrytis byssoidea carbon sources colored varieties conidia conidiophores cultures produced dextrose diameter disease development dry plot fungus germination highly significantly greater hyphal cells hyphal strands illus induced infection inoculated inoculum large number Mass transfers medium method mild and pungent mild varieties minutes moist mycelial cultures mycelial tufts neck rot nitrogen mustard non-sporulating onion bulbs onion tissue outer scales pathogenicity peptone percentage of variants periphery petri dishes pigment plates potassium oxalate potato-dextrose agar protocatechuic acid pungency relation of moisture scattered sclerotium formation Single-spore culture sodium acetate sodium citrate sodium potassium tartrate Southport species spore suspension spores sporulating cultures strongly pungent varieties sugar concentration surface Table temperature total mild total pungent varieties treatment typical wild type uranium nitrate variability variant groups Walker wet plot white aerial mycelium white mycelium white varieties width