One, Bean Pod Disease (a) Symptoms. This disease primarily affects the stems, leaves, and pods of bean plants, often appearing near the base of the stem or in the lower sections, especially close to the ground. Once infected, the affected stem initially shows water-soaked lesions that later become soft and decayed at the nodes. The stems above the infected area may wither and die. Under high humidity, the diseased tissue breaks down, and a white mold develops on the surface. On the leaves, the early symptoms appear as dark green, water-soaked spots that gradually expand into round, brown lesions with a layer of white mold. The infected parts also produce mold and rot. (b) Control Measures. It is recommended to plant disease-resistant varieties and implement crop rotation. Choose well-drained sandy loam soil, raise the planting beds, and ensure good air circulation by avoiding overcrowding. Drainage should be maintained after heavy rains. Early detection is crucial; spraying with 58% Mancozeb WP diluted 500–800 times, 64% Metalaxyl Manganese Zinc WP at 500 times, or 72.2% Trichoderma 800 times can help control the disease. Apply these sprays every 10 days, and repeat up to two or three times for better results. Second, Bean Blight (a) Symptoms. The disease usually starts from the lower leaves, showing irregular, water-soaked spots along the leaf margins, especially at the tips. As the infection progresses, the leaves turn yellow and wilt, spreading upward until the entire plant collapses. The roots of infected plants often show cracked bark, and the vascular bundles turn brown. In humid conditions, a pink mold appears on the infected areas. (b) Control Measures. Implement a crop rotation system for more than three years, ideally with grass crops. Apply lime to acidic soils at a rate of 100 kg per acre to reduce disease incidence. For chemical control, apply 50% Carbendazim WP diluted 1000 times, 10% Pymetrozine 400 times, or 75% Thiophanate-methyl WP at 1000 times through irrigation. Use 50–150 grams per application, repeating every 7–10 days, up to two or three times. Mixing 50% Carbendazim WP with 500 kg of dry soil and 200 kg of compost can also help suppress the disease. Third, Bean Rust (a) Symptoms. Rust mainly affects the leaves, but can also damage petioles and pods. Small yellow spots appear on the underside of the leaves, which later turn brown and develop into raised pustules. These pustules grow larger and release brown summer spores. When the pustules rupture, they release red-brown spores. (b) Control Measures. Clear fields of diseased residues after harvest and burn or bury them. Select resistant varieties such as Yuexia No. 2, green beans, or Suifeng No. 8. For chemical control, use 50% Sulfur Suspension at 150 times, 75% Thiophanate-methyl WP at 1000 times, 50% Carbendazim WP at 800–1000 times, or 200% Rust Rust at 800–1000 times. Regular applications can significantly reduce rust outbreaks. Fourth, Bean Angular Leaf Spot (a) Symptoms. This disease mainly affects the leaves, stems, and pods. Early symptoms include purple-brown spots on both sides of the leaves, which enlarge into nearly round, dark brown lesions with a diameter of 1–2 cm. The edges are not clearly defined, and when wet, the lesions appear covered with a dense, slimy layer, especially on the underside of the leaves. Severe infections can cause premature pod drop, leaving only small top leaves and greatly reduced yields. (b) Control Measures. Remove diseased leaves early to prevent spread. After harvest, clear and destroy all plant debris. Improve field management by planting at appropriate densities to enhance air circulation and reduce humidity. Apply phosphorus and potassium fertilizers to strengthen plant resistance. For chemical control, spray 50% Carbendazim WP at 500 times, 75% Thiophanate-methyl WP at 800 times, or 65% Difenoconazole WP at 600 times. Apply 14% Ammonium Solution at 400 times, repeating every 7–10 days, up to two or three times. Fifth, Spodoptera Virus Disease (a) Symptoms. Infected leaves show dark green and light green mottling, with the green areas forming raised or sunken blister-like structures. Leaves often curl downward, and some beans may become deformed. Affected plants are stunted, with delayed flowering and significant yield loss. (b) Prevention and Control Measures. Use virus-resistant varieties. Establish virus-free seed sources and maintain clean fields. Improve plant health through proper watering and fertilization. Monitor and control aphids from the seedling stage onward, as they are key vectors for the virus. Effective aphid management helps prevent the spread of the disease. Fish Sauce,Fish Sauce Low-Sodium,Fish Sauce Glass Bottle,Good Fishs Sauces Brewed Zhejiang Industrial Group Co., Ltd. , https://www.xingyeseafood.com