Acute wilt of cotton?

There are many types of symptoms in the adult stage of Fusarium wilt. Leaves can also be shown as yellowing type, reticulate type and other types, easy to fall leaves. The top leaf of the seriously diseased plant is wrinkled and deformed, the color is dark green, the Internode is shortened, and the plant type is short. Acute wilting type often occurs after rain, and the cotton plant suddenly loses water. The leaves quickly withered and withered, the leaves drooped, and the leaves often fell into poles.

Morbidity regularity

Fusarium wilt of cotton overwinters mainly in diseased plant seeds, diseased plant residues, soil and manure. The transportation of bacterial seeds and cake fertilizer is the main cause of the disease in the new disease area. Farming, management, irrigation and other agricultural operations of cotton fields in diseased areas are important factors for close transmission. Diseased plant roots, stems, leaves and bell shells can grow spores in high humidity, which can spread with air flow, wind and rain and infect the surrounding healthy plants.

The incidence of Fusarium wilt is closely related to temperature and humidity. generally, the soil temperature begins to show up at about 20 ℃, and the incidence peak is formed when the soil temperature rises to 25-28 ℃. When the soil temperature rises to more than 33 ℃, temporary latent disease occurs, and when the soil temperature drops to about 25 ℃ in autumn, the second peak occurs. After heavy rain or rainy years in summer, the disease is serious due to the decrease of soil temperature. Low-lying, heavy soil, partial alkali, poor drainage, partial application of nitrogen fertilizer and insufficiently mature bacteria-carrying manure, continuous cultivation and extensive tillage of cotton fields, and reoccurrence of cotton fields with many root nematodes.