How to prevent vegetable knock-out
The damping-off disease is a multi-stage, severe fungal disease of vegetables such as melons, solanes, legumes and crucifers. It is distributed throughout the country and occurs in spring and summer. Conservation cultivation can occur throughout the year. The most frequently occurs in the cortex before the two-leaf seedling stem before the corkification. Seedling stem base or middle part of the water after the disease was water-like, such as boiling water burned, the disease quickly became soft linear contracture. The disease progressed very quickly, and the cotyledons did not wilt. The seedlings had fallen to the ground. When the humidity is high, white lumps appear on the diseased seedlings and surrounding soil surface. The damping-off disease spreads rapidly under suitable conditions. Within one or two days after the onset of the individual seedlings, the surrounding seedlings can fall down and die. Because of the rapid onset of disease, the prevention and control methods of greenhouse vegetable diseases and pests are difficult to control, often causing seedlings or seed destruction. Great.
The devastating disease is mainly caused by Pythium and Phytophthora in the soil. Seedbed humidity, high temperature, high humidity and hot and cold, and seeding capacity is too large, young seedlings are prolonged, poor ventilation and light transmission is easy to disease, water is easy to become the center of the disease. Prevention measures are mainly aimed at the cause of morbidity, improve the cultivation conditions, and avoid the spread of diseases.
The seedbed requires high topography and good drainage, and fertile, loose, disease-free new soil is used for the bed soil, and the applied organic fertilizer must be fully decomposed. For wards, the seedbed can be treated with pentachloronitrobenzene in advance, or mixed with carbendazim, chlorothalonil, thiophanate, etc. or sprayed at the time of sowing. Can also be seeded under the cover of medicine soil, but to grasp the amount of good, so as not to cause phytotoxicity. Seed evenly to avoid overtightness, cover shallow soil after sowing. Seedling watering should not be too much, pay attention to ventilation and ventilation. For severe wards or early onset, spraying with fungicides or irrigating them for 7 to 10 days, general broad-spectrum bactericides such as chlorothalonil, mancozeb, pyrimethanil, caustacil, and urea-manganese Zinc, thiophanate, metalaxyl and others are available. The diseased seedlings were found to be removed in a timely manner, the surrounding diseased soil was removed, and a medicinal soil mixed with a bactericide was sprinkled around to prevent the disease from spreading.
8 Inch Face Access Control,8-Inch Touch Screen Access Control Device,8 Inch Face Recognition Attendance Access Control,Face Recognition Attendance Access System
Chongqing Huifan Technology Co.,Ltd. , https://www.hfsecuritytech.com