Abstract
A large inoculation chamber was constructed in the greenhouse in order to screen potatoes for resistance toPhytophthora infestans. It consisted of a wooden frame 13 feet long, 7 1/2 feet wide and 6 feet in height at the eaves having a gable-type roof with approximately a 3-inch rise per lineal foot. The frame supported the .005-inch plastic film and the humidity and air-conditioning equipment. The temperature and relative humidity were controlled automatically with a thermostat and electronic humidistat, respectively. The cost of the chamber was approximately $600.
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