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Control methods: 1, a reasonable rotation: with grass crops: rotation for 2 to 3 years. 2, a reasonable fertilization: fine soil preparation, increase the application of organic fertilizer or 5406 fertilizer. 3, improve the quality of sowing: spring cotton to 5 cm deep Shishida 14 °C suitable for sowing, general sowing 4 ~ 5 cm deep is appropriate. 4, to strengthen seedling management: appropriate early seedlings, diligent cultivators, reduce soil moisture, increase the temperature, nurturing strong seedlings. 5, seed dressing seed dressing, with a seed weight of 0.5 to 0.8% of 50% carbendazim, or seed weight of 0.6% of 50% thiophanate-methyl, seed dressing.
2. Fusarium wilt Wilt disease, also called plant cancer, is the enemy of cotton production and has spread rapidly in recent years. Fusarium wilt is characterized by: dwarfing plants, grayish-green leaves, brittleness, stalk bending, shortening of stem knots, depression of the roof, and vascular bundles in stems turning grayish brown or light black. Incidence conditions: high temperature and high humidity, even planting, sunny days after the rain, will die, into a film death.
Prevention methods: 1. Soil improvement: Based on the application of organic manure, nitrogen, phosphorus, and potassium, an additional 0.5 kilograms of weight herbicide per acre will be added, and then ploughing can remove most of the soil bacteria, and can make the soil Increase the air permeability, eliminate the content of alanine in the soil, remove the hardened, improve the saline-alkali, enhance the resistance of the plants, and reduce the damage of the yellowish wilt. 2, the amount of nitrogen fertilizer. 3. Watering at an appropriate time. On average, there are two bells per plant. The first water is poured when the weather is dry. The watering will promote the occurrence of disease. 4. The seedling, bud and flowering period are sprayed 2-4 times with the first aid. Or hymexazol, etc., prevent yellow wilt. 5, on the diseased plants can be surgically controlled, set on the base of the cotton stem 5 to 6 cm with a knife to open 2 to 3 cm longitudinal mouth, insert two with the yellow liquid first aid soaked for more than 4 hours of the matchstick, take The above methods can effectively control the damage of cotton wilt, and can also control the blight of other crops.
Cotton Common Diseases and Control Techniques
1. Bacterial crop blight, commonly known as rotten root disease and black root disease, occurs in all cotton regions of the country. After cotton seedlings are injured, yellowish-brown spots develop on the stem base near the ground, and then turn into dark brown. Gradually sag and rot. In severe cases, the disease becomes thinner and the diseased seedlings die or fall. Cotyledons form an irregular, yellow-brown lesion after victimization, and later the diseased department breaks off and becomes perforated. In the adult period, brown spots appear on the leaves, and the perforations are exfoliated.