Johnson, D. A., and T. Cummings, F have Latent Infection by Phytophthora infestans of Potato Seed Tubers During Long-Term Cold Storage in the Pacific Northwest, found that the severity of the disease leaves more burns on day 181-209 of the harvest season, the average temperature of 4.2 and 4.1 2 degrees Celsius. By the sample phrases, potato cultivars infected with 0-44% who don't show symptoms, however, Phytophthora infestans, of sponngia has been observed by the species brought to the verse parts, curing in the 15° c or humidity from the late blight symptoms, but symptoms do not appear on the head. When assessing the 22-23 degrees Celsius for three weeks, the development of late blight symptoms in sporangia and potato cultivars, suggesting that symptoms do not appear to eliminate hidden form the head caused by P. infestans with long time intervals. When moving from the moisture curing rooms to 15 degrees Celsius. Spore is created after that 9-24 hours on the symptoms, and 6-29 days on the head that does not display the symptoms struck potato varieties in scripting and production of sporangia of P. infestans living is shown after.
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