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Environmental Factors Affecting Conidial Survival of Five Pear Decay Fungi. R. A. Spotts, Associate Professor, Oregon State University, Mid-Columbia Experiment Station, Hood River 97031. Plant Dis. 69:391-392. Accepted for publication 19 November 1984. Copyright 1985 The American Phytopathological Society. DOI: 10.1094/PD-69-391.

The survival of conidia of Botrytis cinerea, Mucor piriformis, Penicillium expansum, Pezicula malicorticis, and Phialophora malorum on pear fruit surfaces in the orchard and under selected temperature-relative humidity combinations was determined. Under controlled conditions, survival half-life (T50) of B. cinerea and Penicillium expansum often exceeded 1 mo, but the T50s of M. piriformis and Pezicula malicorticis often were less than 2 wk. Survival of these fungi decreased as temperature increased from 1.1 to 30 C. The T50 of Phialophora malorum varied from about 2 to 6 wk and was less at 20 than at 10 or 30 C. Conidial survival in the orchard was about 2040% of that at similar temperature and relative humidity in controlled environments, and the T50s in the orchard of B. cinerea, Penicillium expansum, and M. piriformis were 14.4, 6.1, and 4.2 days, respectively.