Symptoms and control of Rhizoctonia sclerotiorum of lily

If the infection is mild, it only harms the leaves in the soil and the green leaves in the lower part of the buds, with sunken light brown spots on the leaves. Generally speaking, although the growth of the plant is affected, it can continue to grow. If the plant is seriously infected, the growth of the aboveground part will be hindered, and the white leaves in the underground part and the basal leaves in the aboveground part will rot or wilt off, leaving only brown scars on the stem. Young leaves and growth points are often harmed, and infected plants will inhibit rhizome development, which in turn hinders plant growth, resulting in poor flowering or even no flowers, because the flower buds have dried up at an early stage. The pathogen of the disease is eggplant shredded nucleus. Fungi mainly infect plants from the soil and are most active when the temperature is higher than 15 ℃ and humidity. The control method uses soil disinfectant to disinfect the soil that has been suspected to be infected. After disinfection, the soil must be protected from infection, especially when the soil temperature is high in summer. If the previous crop has been infected, general soil disinfectant should not be applied. Before planting, the soil was pre-treated with Rhizoctonia, and it was completely mixed into the soil 10 cm deep.