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Comparative nutrient dependency of botrytis squamosa and botrytis cinerea for germination of conidia and pathogenicity on onion leaves



Comparative nutrient dependency of botrytis squamosa and botrytis cinerea for germination of conidia and pathogenicity on onion leaves



Phytopathology 67(2): 212-218



Germination of conidia and germ tube length of isolates of B. squamosa were similar in water and nutrient solution. Spraying conidia in water onto [onion, Allium cepa] leaves resulted in production of expanding lesions. The frequency of lesions was increased by addition of nutrients to the inoculum. Germination of conidia of all isolates of B. cinerea was significantly lower in water than in nutrient solution. Germ tube elongation in water ceased almost immediately upon emergence of the germ tube from the conidium. Spraying onion leaves with conidia suspended in water failed to produce lesion, but addition of an exogenous nutrient source resulted in formation of expanding lesions. Nutrient dependency of conidia of B. cinerea, but not of B. squamosa, increased with increased age of dry-harvested conidia. Combining the 2 spp. during incubation had no effect on conidial germination. Leaching conidia of either species with water inhibited germination, but leaching with nutrient solution did not. Conidial germination and lesion formation (numbers) by both species were increased by diffusate from the onion-leaf lacuna, filtrate from cattail pollen, or by Czapek-Dox broth amended with yeast extract. Glucose (1%) was a weak stimulant for both germ tube elongation and lesion formation.

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