In the cultivation of green onions, garlic, leeks, onions and other onion and garlic vegetables, the phenomenon of dry tip is easy to occur. If the control is not properly controlled, a large number of leaves of the whole plant will dry up. In severe cases, the field will be like a fire. It has a great impact on yield, and in severe cases, it can cause no harvest. What is the cause of this and how to prevent it? Today, I would like to recommend an excellent fungicide to everyone, which has a very prominent effect on the prevention and control of green onions and garlic.
1. Causes of dry tip
There are many reasons for the dry tips of onion and garlic vegetables, mainly physiological and pathological. The dry tips with good physiological properties are mainly due to drought and water shortage, and the pathological dry tips are mainly caused by gray mold and blight. , The most important reason for dry tip in production is gray mold and blight.
2. Main symptoms
Grey mould caused by green onion, garlic, leek and other Onions and garlic vegetables dry tip is mostly “green dry”, early, on the leaves grow many white spots, when the temperature and humidity is appropriate, the disease spots spread from the leaf tip down, resulting in leaf dry. When humidity is high, a large gray mold layer can be formed on dead leaves.
The dried tips of green onion, garlic, leek and other vegetables caused by the disease are mostly “white dry”. At the beginning of the disease, the green and white spots appear on the leaves, which become gray and white spots after expansion, and the whole leaves are wilted at the later stage. When the rain or humidity is high, the disease grows white woolly mold; When the weather is dry, white mildew disappears, tear the epidermis and see woolly white mycelium. When the disease is serious, the field is dry, like fire.
3. The cause of the disease
Under suitable temperature conditions, high humidity is the main reason for the occurrence and spread of botrytis and blight. Botrytis cinerea and Phytophthora mainly overwinter or summer in the soil attached to the diseased body. When the temperature and humidity are suitable, the pathogenic bacteria remaining on the diseased body begin to germinate, producing a large number of hyphae and conidia, which invade the soil. In the host body, and absorb nutrients from the host cells or cells to grow and reproduce.
These conidia or mycelium spread in the field by means of air, rain, irrigation water, etc., and continue to infect other plants. Under suitable temperature and humidity conditions, the spread spreads very fast, and generally it can cause large-scale occurrence in about 7 days.
4. Prevention methods
Botrytis cinerea and blight spread quickly and cause serious harm. Therefore, it should be sprayed in time for prevention and control in the early stage of the disease. 30-50 ml/mu of 38% pyraclostrobin-boscalid suspension agent can be used, and 30-40 kg of water is added to the stem. The leaves are evenly sprayed and sprayed every 7 days to better control the continued damage of the dry tip.
Post time: Sep-21-2022