Occurrence, Sporulation and Pathogenicity Studies with Glomerella cingulata Associated with Crown Rot of Boxed Bananas

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Abstract
Perithecia andacervuli of Glomerella cinqulata occur on all above ground parts of the banana plant in Honduras but are more abundant on the persistent bracts. Perithecia and acervuli were most abundant in the wet season; few were found during the hot dry period. Ascospore discharge required moisture or long exposure to 100% relative humidity. Perithecia discharged viable ascospores in diminishing quantities during 6 weeks of periodic wetting and drying. Maxium germination of ascospores occurred in 6 hours at 100% relative humidity at which time 80% of the ascospores had formed appressoria. Mature perithecia were formed on bract tissue 6 days after innoculation. but failed to form at temperatures of 30[degree]C or above, although conidia form abundantly at 30[degree] and 32[degree]C. Mycelial growth was retarded at 35[degree]C. The isolates varied in cultural characteristics and pathogenicity or banana crown tissue.

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