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MINIMUM DEW PERIOD AND TEMPERATURE REQUIRED FOR INFECTION BY PIRICULARIA ORYZAE
ARMY BIOLOGICAL LABS FREDERICK MD
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An equation describing minimum conditions of temperature and dew period required for infection of rice leaves by Piricularia oryzae Cav. has been derived. Pairs of values from the curve describing the lower 95 confidence limit of the mean function are 60 deg F and 12.2 hours of dew, 65 deg F and 10.9 hours, 70 deg F and 9.7 hours, 75 deg F and 8.6 hours, and 80 deg F and 7.7 hours. It is suggested that infections at these values may be rare events in nature, and that the likelihood of infection increases as these values increase. Use of the equations lower 95 confidence limit may improve the accuracy of existing blast disease forecasts.
APPROVED FOR PUBLIC RELEASE