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Effects of Heat Treatments on Populations of Four Fruit Decay Fungi in Sodium Ortho Phenylphenate Solutions. R. A. Spotts, Associate Professor, Oregon State University, Mid-Columbia Experiment Station, Hood River 97031. L. A. Cervantes, Experimental Biology Technician, Oregon State University, Mid-Columbia Experiment Station, Hood River 97031. Plant Dis. 69:574-576. Accepted for publication 10 January 1985. Copyright 1985 The American Phytopathological Society. DOI: 10.1094/PD-69-574.

Conidia of Botrytis cinerea, Mucor piriformis, Penicillium expansum, or Phialophora malorum did not germinate after exposure to temperatures of 54.4 or 60 C for 120 min in sodium ortho phenylphenate solutions. M. piriformis and Penicillium expansum conidia in water from packinghouse dump tanks containing high populations were killed by heating to 54.4 C for 25 min. Heating dump-tank water to 54.4 C for 20 min in a packinghouse lowered populations of M. piriformis and P. expansum. Costs to heat were 77% less than costs to empty, clean, and refill the 11,355-L tank.