In recent days, farmers have consulted with the problem of root rot (red root), and asked whether the disease is related to wilt disease. How to distinguish and treat? The answers are as follows:
Root rot of bean roots is mainly harmful to the roots and stem bases. It is common and has a severe incidence. The incidence rate is generally 25%-40%, and serious as high as 60%. The disease can occur from a single seedling emergence and enter the peak of the disease within 3-4 weeks. At the onset of disease, the lower leaves of the plant turn yellow, and the diseased department produces brown or black spots, and the roots rot to necrosis. When the diseased roots are longitudinally cut, the vascular bundle is reddish-brown and gradually expands to the stem, resulting in wilting of the shoots and leaves, and in the case of relatively high humidity, the diseased part produces pink moldy material. High temperature and high humidity, many underground pests, and continuous cropping plots are conducive to the occurrence of severe disease.
Fusarium wilt disease began to show signs of disease in flowering and setting. At the beginning, the lower leaves turned yellow, followed by upward development, the veins became brown, and the diseased plants appeared wilting, which could return to normal sooner or later. Longitudinally cut stems or rhizomes, vascular bundles turn yellow-brown to dark brown, and in severe cases the leaves scorch and fall off and even die. Poor terrain, lack of fertility, soil viscosity, lack of potassium, or the application of unripe organic fertilizers can make the disease worse.
In addition to governance methods: 1. Soil treatment. With 99%?fmycobra WP 2-4 g/m2, 1000 times the water spray bed, shallow seeding after sowing. Or per square meter with 70% thiophanate-methyl WP 4-6 g + 50% carbendazim WP 5-8 g, mix well with 20 kg of fine soil, and apply 1/3 of the drug to sowing Before spreading it to the noodles, the remaining 2/3 of the medicine soil is planted after sowing.
2. Root rot medicine control. With 25% Azoxystrobin Suspension 1500x, 72.2% Promiformin Hydrochloride Aqueous Solution 750x + 99% Fammycin Wettable Powder 3000x, or 58% Amethyst Zinc Water Dispersible Granule 600 Dilution +5o% chlorobromoisocyanuric acid WP 750 times spray control.
3. Wilt disease control. Use 42.8% of fluconazole fungicide suspension 1500 times, 85% bourothibrin, f-amylakine WP 750 times, 20% rosin acid water 2000 times, or 35% phenylarsinate 1000 times liquid agent + 80% ethyl allicin EC 3000 times spray control.
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