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Effect of Moisture on Conidiophore Morphology of Cristulariella pyramidalis. A. J. Latham, Department of Botany and Microbiology, Auburn University, Agricultural Experiment Station, Auburn, Alabama 36830; Phytopathology 64:1255-1257. Accepted for publication 30 April 1974. DOI: 10.1094/Phyto-64-1255.

Cristulariella pyramidalis incubated at 21 C on wet lesions of pecan leaves formed single-headed conidiophores only. Conidiophores were branched 35% of the time when leaf lesions were incubated at 96% relative humidity (RH) and 21 C. Hyphal-tip cultures from germinating branched conidiophores produced an average of 60% branched fruiting structures on pecan leaves at 96% RH. However, only single-headed conidiophores formed when the same leaves were wetted thoroughly and incubated in a saturated atmosphere.