The pathogenesis of blight

Mycelium and sclerotium were used to overwinter in soil or diseased tissues, with strong saprophysis, which could survive in soil for 2 ~ 3 years, and was spread by rain, running water, bacteria-bearing compost and agricultural tools.Germs develop warm 20 ~ 24 ℃, unearthed seedlings and went to suffer, more commonly occurs in middle and later periods of the seedling.In the seedling stage bed temperature is higher or in the late seedling, rainy wet, soil is too sticky, heavy stubble disease.Sowing too dense, not timely thinning, high temperature easy to cause the disease.