Potato late blight is a climatic epidemic, which is greatly influenced by climate. It is more serious in rainy season, but it will be less or no in rainy and dry conditions. In case of rainy weather and high humidity from germination to flowering, it is beneficial to the occurrence and prevalence of diseases. As long as the susceptible varieties reach about 20℃ in the daytime and the relative humidity is above 95% for more than 8 hours, and the high humidity condition at night 12℃ lasts for more than 13 hours, they can spread 10 days after onset.

Variety resistance:

At present, the main potato varieties have poor resistance, such as Feiwuruita, Zaodabai, Atlantic and Shapotou, which are beneficial to the epidemic harm of the disease because of their good quality, large planting area, single variety in large planting area and suitable climate.

Cultivation management:

Poor cultivation management, such as poor ventilation and high humidity in the field, is conducive to the spread of diseases. Potato continuous cropping is easy to lead to the abundance of bacteria in the field, the increase of soil bacteria and seed potato bacteria, and the lack of soil nutrients in the plots that have been planted for many years, which is easy to cause diseases.

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