Sugar Cane Leaf Spot

Symptoms mainly occur on leaf sheaths. Near the ground at the first disease, lesions irregular shape, red, the central gradient grayish yellow, darker edges, showing auburn. Sometimes expanded to the leaves, auburn wide horizontal stripes tiger skin markings, it is called tiger spot disease.

The pathogen Rhizoctonia solani Kuhn is known as Rhizoctonia solani, belonging to the fungus Aspergillus spp. The sexual state is Thanatephorus cucumeris (Frank) Donk said melons. In the soil, a thin layer of waxy or white-pink network is formed to the reticulate sub-solid layer. The resulting load is barrel-shaped to sub-cylindrical, slightly wider than the hyphae supporting the load, and the burden has 3 to 5 small stems. , which bears spores. The spores are elliptic to broad-barreled, with a wide base and a size of 7.5 to 124.5 to 5.5 (μm). The basidiospores can germinate repeatedly and form secondary burdens on the load. The sclerotia of Rhizoctonia solani are formed by the dense branching of the single mycelium tip, or the mycelium formed by the tip closely and the mycelium.

The transmission route and onset conditions are wintering in the soil with mycelia or sclerotia, and can be rotted in the soil for 2 to 3 years. Mycelium can directly invade the host and spread through water currents and agricultural tools. The germ development is suitable for temperature 24°C, maximum 40-42°C, lowest 13-15°C, and suitable pH 3-9.5. Sowing too dense, not timely, the temperature is too high to induce the disease. In addition to damaging sugar cane, the bacteria can infect nearly 50 species of 15 families including cucumber, corn, beans, cabbage, rape, and cabbage.

Control method Spraying 20% ​​Methyl Chlorophorb Emulsion (Likegar) 1200 times or 5% Jinggangmycin Water 1500 times, 10% Lekling Water Suspension 300 times, 95% Greenhenge 1 (Goodewing spirit) 4000 times quality liquid.

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