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The Occurrence, Prevention and Control of Potato Late Blight in China

YUAN Junhai (Department of Agronomy of Zhangjiakou Agricultural College,Xuanhua 075131,China)  
The pathogen, development, forecast, resistant breeding and control of potato late blight in China are reviewed in this paper.At present, the constitution of physiological race of Phytophthora infestans is also mainly formed by the combinations of 1,3 and 4.A2 mating type has been found in six provinces(autonomous region or municipality).Diseased seed potato is the major preliminary infection source, the appearance of center disease plant is an important sign of occurrence, and the rainfall from June to August is a key factor of epidemics.To breed cultivars with horizontal resistance is stressed in late blight resistance breeding.In order to reduce the metalaxylresistance isolates, we can alternately apply Ridomil with Ridomilmongcin, Dithane or Bordeaux.
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