Factors affecting postharvest infection of stored cabbage tissue by Botrytis cinerea

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Abstract
Single-spore isolates of Botrytis cinerea from commercially stored cabbage exhibited a broad range of virulence. Spore germination and hyphal growth required an exogenous source of nutrients. The ability of either spores or mycelium to cause infection of stored cabbage tissue was also dependent upon exogenous nutrients. Nutrients required for infection could be supplied in the form of glucose, cabbage leaf extract, potato dextrose agar (PDA), or by a wound at the site of inoculation. The concentration of nutrients and (or) spores influenced the ability of B. cinerea to cause tissue decay whereas spore age and bacterial populations did not. Spores on the surface of cabbage leaves germinated within 4 to 8 h in nutrient solution; an additional 8 to 16 h in nutrient solution were required for successful infection. The optimum temperature for fungal growth and for infection was 20 to 25C. The optimum relative humidity for decay was above 97%; decay did not occur at relative humidities below 93%.

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