Abstract
Potatoes exposed to direct solar irradiation during June and July for as little as 60 minutes will develop more soft rot than potatoes picked up and packed immediately after digging. Prolonged exposure may cause two changes in potatoes. First, the potato tissue may be killed; secondly, if the absorbed heat causes the temperature to rise to approximately 113° F. or greater (sublethal), there will be no symptoms of injury, however, the tubers become more susceptible to the bacterial soft rot pathogen when inoculated through bruises caused by harvesting operations. The latter change appears to be a reversible phenomenon from which tubers will recover if not inoculated naturally or artificially.
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