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PATHOGENICITY OF BOTRYTIS SPECIES ON ONION UMBELS AND SCAPES UNDER
FLOWER BLIGHT AND SCAPE GIRDLING OF ONION GROWN FOR SEED PRODUCTION
IN NEW YORK
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APDA autoclaved greenhouse soil average individual seed blighted florets blighted onion florets blighted umbels Botrytis cinerea Botrytis leaf blight Botrytis squamosa byssoidea cepae was isolated chlorothalonil sprays cinerea and B_ cinerea or B_ conidia cultivars current study development stages dew chamber Early Yellow Globe Ellerbrock and Lorbeer field trials Fisher's Protected LSD five replicates florets open fungi fungicide fungicide sprays Fusarium oxysporum germination immature seed capsules incidence of seed incubated individual seed weight inoculated July lesions observed onion cultivars onion flower blight onion seed produced onion umbels open florets open umbels Orange County oxysporum f pathogen percentages of blighted percentages of florets Petri dishes Phytopathology planted in autoclaved Ramsey resultant seedling stand Salient statistics saprophytic scape girdling seed coats seed production fields senescence significantly sodium hypochlorite sodium hypochlorite solution surface disinfested susceptibility symptom types treatment unopen unsprayed control vinclozolin virulence walk-in growth chamber