Symptoms and Control of Corn Rust and Sheath Blight
Answer: Corn rust mainly infects leaves. In severe cases, it can also infect the ear, temporal leaves, and male flowers. In the initial stage, only light yellow long to oval brown pods were scattered on both sides of the leaves. After the small larvae ruptured, rust-colored powders (spore-producing uredia spores) were scattered. Lateral lesions produced black round or protuberances. , After the cracking exposed dark brown winter spores. Corn rust mainly occurs in the rainy season from July to September. Under the premise that there is a bacteria source, the temperature is about 27°C, and the disease is rapidly occurring when the rainfall is high and the humidity is high. Field planting density, poor ventilation and light transmission, and low-lying terrain are easily pathogenic. The frequent typhoons during the early corn growth this year brought a lot of rust spores, abundant field bacteria, coupled with the long duration of moderate temperature and high humidity weather after the “Liqiuâ€, and suitable environmental conditions. This is the main reason for the occurrence of rust in large areas of corn in our province. The use of drugs to prevent corn rust should be early prevention and early management, and strive to prevent and treat sporadic diseases in time. Applicable drugs include azoxystrobin, propiconazole, diniconazole, benzopicazole, azoxystrobin, and tebuconazole. And so on, can be chosen according to local conditions. Severe disease occurs once every 10 days or so, continuous control of 2 or 3 times, control of disease expansion. In the future, heavy rust on the plots will be used to prevent the early use of pesticides in combination with comprehensive control of pests and diseases. In recent years, the occurrence of maize sheath blight has become more and more serious, and the area of ​​incidence has increased year by year. It has become one of the major factors that restrict corn production. The disease mainly damages the corn leaf sheath, and it can also harm the stem, causing serious damage to the ear. In the early stage of disease, dark green water-stained lesions were produced on the leaf sheaths of 1-2 leaves at the base, and they expanded and merged into irregular-shaped or mottle-like lesions. The lesions are gray-brown in the middle and dark brown on the edges, spreading from the bottom up. Sprouts infected with ear buds also produce the same moire-like spots. After the ear is infected with the disease, it is bald, and the grain is flat or brown and rot. When severe, the base of the stem becomes grayish, and the secondary roots are tan or rot. When the rain and high humidity persist for a long time, the disease minister produces dense white mycelia, and the mycelium further aggregates into multiple mycelium clusters to form small sclerotia. Sheath blight usually begins at the jointing stage of corn. The condition of tasselling develops rapidly, and the damage during heaving is serious. Temperature 20 ~ 30 °C, rain, rainfall, high humidity, disease progression. Corn crops, sowing too dense, too much nitrogen, heavy disease. Poor terrain, poor drainage, and heavy soil moisture are responsible for the disease. The chemicals used to control corn sheath blight should be used at the early stage of disease. Applicable drugs include Jinggangmycin, hexaconazole, tebuconazole, benzopropiconazole, azoxystrobin, and thiadicarb. Focus on the spraying of corn plants at the base of the general interval of 7 to 10 days and then medication control once to improve control efficiency. Active Pharmaceutical Ingredients Active Pharmaceutical Ingredients(API) refer to the raw materials used in the production of various preparations. They are the effective ingredients in the preparations. They are various powders, crystals, extracts, etc., prepared by chemical synthesis, plant extraction or biotechnology, but Substances that the patient cannot take directly. API is intended to be used in any substance or mixture of substances in the manufacture of pharmaceuticals, and when used in pharmaceuticals, it becomes an active ingredient of the pharmaceuticals. Such substances have pharmacological activity or other direct effects in the diagnosis, treatment, symptom relief, treatment or prevention of diseases, or can affect the function or structure of the body. According to its source, active pharmaceutical ingredients are divided into two categories: synthetic chemical active Pharmaceutical ingredients and natural chemical active Pharmaceutical ingredients. Chromium Picolinate,Tianeptine,6-Paradol,Aminobutyric acid,acetylcysteine,L-Carnosine Xi'an Gawen Biotechnology Co., Ltd , https://www.ahualyn-bios.com