After the onset of the sorghum rot disease, the upper part of the crop is in a poor condition, apparently dwarfed and turned yellow, and when the onset is severe, the aboveground parts die off, and the roots and stems are gray-black to dark brown and wet rot.
Basal rot, also known as blight, is a devastating disease of the cockroach called by the peasants as "death plague" or "blight disease." The whole growing season can be affected. The period from mid-September to early October is the peak period. The rate of dead plants can reach 20%-30%, and serious fields can reach more than 80%. Once the field performance is dead or dying, it is necessary to quickly use drugs at the early stage of disease onset, or when there are individual cases, to control the onset center, otherwise it is difficult to control. At present, there are no good chemical agents. The key is to do a comprehensive prevention and control in the early stage.
Agricultural control chooses disease-free plots to retain seed. 2-3 years of crop rotation or crop rotation with rice, lotus root, lotus root and other crops. At the early stage of disease, the diseased plant was removed in a timely manner and taken out of the field and buried deep, and the pesticide was sealed off from the onset center. After harvesting, the leaves of stubble leaves left behind in the field should be promptly removed and concentrated. Before the beginning of May, wild seedlings of bulbs left in the field should be removed.
Strengthen the management of scientific fertilization, do not apply nitrogen fertilizer, increase phosphorus, potassium fertilizer. In September, topdressing was performed 2 times to prevent later defermentation. Moderately suitable for drying the field, 15 days after transplanting began to dry the field, after the onset of disease should also control the field. The drying field needs to be moderate. It is advisable to dry it to the surface of the field with moist, little cracking (that is, mud surface is hard and soft inside), and then it is rehydrated immediately. The drying time is usually 2-3 days and up to 5 days. Sunny days are shorter and rainy days are longer, but September should not be re-sunshine. At the beginning of the disease, the field should maintain a certain water layer, and the field should be kept moist in the middle and late growth stages.
When the soil is disinfected, Daechi plows, 100 kg of lime per acre is applied to the field, and 5-7 days later, 2.5 kg of diosulfuron is applied in combination with the base fertilizer.
Sterilization of bulbs and seedlings was carried out using biopharmaceuticals 14% Baichaojing WP 100 kg water developed by Zhuhai Lvyu Biochemical Technology Research Institute and immersed for 18-24 hours before planting before planting. Soak the seedlings for 18 hours while removing sick and weak seedlings.
Toxic soil treatment seedlings (planting ball) bed before transplanting, with 14% Bai dry WP 100 grams of mixed soil 15 kg, or mixed with 50 grams of biological nutrient liquid fertilizer, will be 14% Baifen net fertilizer and fine The soil is well-mixed, evenly spread in the soil after ploughing, and the ploughing and boring are performed so that the agent is fully distributed in the soil degrading pathogen.
The drip irrigation application will reduce the water level to level with the rhizome of the alfalfa in advance (about 1 centimeter in rhizome), then use 14% Baichanjing WP 100g watered 30kg, or mix 50g of biological nutrient liquid fertilizer. Iron (steel) sprayer sprayer poke the soil from the root of each barn to the drip irrigation. After 3-5 days of application, the irrigation water was restored to the original water level of the planting field. Continuous drip irrigation 2-3 times, interval 10-15 days.
After impregnating the pesticide and removing the total amount of water from the alfalfa planting field, use 14% Baichenjing WP 100g watered 60kg, or mix 50g of biological nutrient liquid fertilizer, evenly sprinkling the plant shoots and rhizomes. After application, the fields were sown that they were soaked until they were soaked in the 1 cm water level of the roots of the alfalfa until the second application. 2-3 consecutive times, 7-10 days apart.
Chemical control of diseased fields in the field should be drained and sprayed (especially at the stem base). Use 20% Prochlordiamine EC 30ml, 20% Triadimefon Emulsion 100g + 40% Polyketone WP 6g, or 50% PK Kinem 0.1kg, or 50% Methyl Thiothiourean sulfur suspension 600-700 times, or 70% mancozeb dry powder 500 times spray. Use 14% of Betzein WP 100 g water 60 kg, or
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