The pathogen mainly overwinters in potato pieces with mycelium, sowing potato pieces with bacteria, resulting in non-germination or death after germination, and some of them become central diseased plants after being unearthed, and full sacs produced by diseased parts are reinfected by airflow to form the disease center, which leads to the rapid spread and expansion of the disease from point to surface; The satisacs on diseased leaves can also penetrate into the soil with rainwater or irrigation water to infect potato blocks, that is, diseased potatoes are formed and become the main source of infection in the next year. The pathogen likes the conditions of warm days and cool nights and high humidity, and the relative humidity is above 95%. Under the condition of 18-22C, it is beneficial to the formation of satisacs, and it is cool & #4; 1-13C for 1-2 hours &; #41; There are also water droplets, which are beneficial to the germination of satisacs and produce swimming satisacs, which are warm & #4; 24-25C for 5-8 hours &; #41; The existence of water droplets is beneficial to the direct production of bud tubes from the full sac, so it is seriously ill in rainy years, humid air or warm and foggy conditions.

Characteristics of the disease

Mycelium mainly lurks in the diseased potato to overwinter, which becomes the primary infection source of the next year's disease. Seed potatoes are sick, and in severe cases, they cannot germinate, or they die before germination is unearthed; The light ones germinated and unearthed, and developed into the central diseased plant in the field. Reinfection is carried out by airflow and rain.

For reference

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