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Ascospore Discharge from Perithecia of Calonectria theae, C. crotalariae, and C. kyotensis. R. G. Linderman, Research Plant Pathologist, Agricultural Research Service, United States Department of Agriculture, Western Region, Ornamentals Research Laboratory, Corvallis, Oregon 97330; Phytopathology 64:567-569. DOI: 10.1094/Phyto-64-567.

Ascospores were discharged from perithecia of Calonectria theae, C. crotalariae, and C. kyotensis on agar cultures, or on detached infected azalea leaves. Ascospore discharge from perithecia on leaves was greater at relative humidities (RH's) of 93% or less, than at 100% RH. Discharged ascospores from perithecia on infected leaves were viable. Oozed ascospores of C. theae infected healthy detached azalea leaves as readily as conidia.