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Effect of Temperature and Moisture on Cristulariella pyramidalis. A. J. Latham, Department of Botany and Microbiology, Auburn University, Auburn, Alabama 36830; Phytopathology 64:635-639. Accepted for publication 12 November 1973. DOI: 10.1094/Phyto-64-635.

Development of Cristulariella pyramidalis from sporophores on agar and pecan leaves was similar at various temp. Lesions caused by C. pyramidalis on pecan leaves increased in size from 6 C through 27 C, with maximal development at 21 C. Sporophores formed on lesions at 9 C through 24 C with maximal production at 21 C. Maximal sporophore production occurred on wet leaves. Low levels of sporophore production occurred at 96 ± 2% relative humidity (RH). Below 94% RH, peripheral development from established lesions did not occur after 24 h nor were sporophores produced. C. pyramidalis remained viable in 60-day-old lesions on pecan leaves and produced sporophores after being moist 96 h.

Additional keywords: epiphytology, humidity chamber, zonate leafspot.