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Heat Activation of Conidial Germination in Periconia circinata. Larry D. Dunkle, Associate Professor, Department of Plant Pathology, University of Nebraska, Lincoln 68503; Gary N. Odvody(2), and Brad A. Jones(3). (2)(3)Graduate Assistant, and Research Technician, respectively, Department of Plant Pathology, University of Nebraska, Lincoln 68503. Phytopathology 65:1321-1322. DOI: 10.1094/Phyto-65-1321.

A brief exposure to elevated temperatures (45-48 C) substantially increases germination of conidia of Periconia circinata. After heat treatment, 50-75% of the conidia germinate within 18 hours on nutrient agar. Conidia of some isolates germinate without heat treatment and some isolates are more responsive than others, but the capacity for germination is not related to pathogenicity or virulence.