Symptoms Guizhou and Taiwan tobacco areas occur from time to time. The main damage stems. The brown lesions first appeared, and then a large number of white filamentous mycelium wrap around the base of the stem in the disease minister's department. Afterwards, many rapeseed-like small sclerotia were produced in the diseased part, which was white at first and later became dark brown. As the disease progresses, the diseased plant grows wilting from top to bottom. Severe rapid yellowing and death occur. When the humidity is high, the diseased part is perishable, leaving only fibrous tissue, and the whole plant is lodging and wilting.
The pathogen Sclerotium rolfsii Sacc. said neat bacteria, belonging to the fungus Fungi. The sexual state is Athelia rolfsii (Curzi) Tu. & Kimbrough. It is called Rhizoctonia and belongs to Basidiomycotina fungus. Mycelium is colorless and has a diaphragm. The sclerotia is composed of hyphae, the outer layer is cortex, and the interior is composed of pseudo-pseudo-tissue and loose tissue in the center. The white color is close to the host. It is yellowish-brown after aging, round or oval, 0.5-3mm in diameter. . Under high temperature and high humidity conditions, the burden and basidiospores are produced. The burden is colorless, unit cell, stick-like, size 166.6 (μm), and the colorless basidiospores are formed on the tips of small stalks.
Transmission routes and pathogenic conditions The bacteria live in the soil with sclerotia or mycelia, and the bacteria can survive in dry soil for more than 10 years. Germs often spread with soil, organic fertilizer, and irrigation water. In continuous cropping, the soil is prone to viscid or rainy, and the crops that are debilitated in the growth of the plant are seriously affected.
Control methods (1) Use paddy fields or land plots with grass crops as the seedbed. (2) Implement rotation. (3) Promote the use of compost or fermented bio-organic fertilizer made from fermented bacteria. In the middle and later stages of tobacco growth, weeding of plant ash, if necessary, weeding plant ash at the base of tobacco plants, severe disease areas or fields, lime can be applied in the spring plowing. (4) In the early onset of the disease, spray 50% ethidium sclerotium net WP 500 times, 50% benomyl WP 1000 times, 50% carbendazim WP 1000 times, and focus on the stem base. 7-10 days, continuous control 2-3 times.
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