Variation in Phytophthora infestans on potatoes grown in walk‐in polyethylene tunnels

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Abstract
SUMMARY: Small areas of potatoes were grown and the foliage successfully infected with Phytophthora infestans over a 10 wk period using walk‐in polyethylene tunnels which had been modified to allow easy transport from one site to another. These protected the infected crops from possible outside sources of blight and contained the disease spatially. The fungus populations spreading from foliage inoculated with P. infestans race (3,4,10, 11) were monitored for racial stability and some variation in race was recorded. In general, novel races were less, rather than more, virulent than the introduced race.