To date, specialists from the Rosselkhoztsentr in the Stavropol Territory have conducted a survey of seedlings of winter grain wedges for infection with diseases on an area of 220.4 thousand hectares. As a result of monitoring, infection of 0.2 thousand hectares of winter wheat crops in the Sovetsky district with rhizoctonia root rot was revealed.
Rhizoctonia root rot of wheat is a plant disease caused by the fungus Rhizoctonia solani JG Kuhn. This is a soil-dwelling fungus that settles primarily in the surface layer of the soil and first infects plant tissues at the level of the soil surface.
The disease spreads, with the help of rapidly elongating hyphae, to the upper parts of plants, including leaf blades. Mycelium particles are carried by the wind over long distances and, falling into favorable conditions, cause a new infection.
The characteristic signs of the disease, as with all root rots, include damage to the primary and secondary roots, the underground internode, as well as the epicotyl and stem base. Starting from phase 3 of the leaves, the root system is damaged: browning of the tips and sections of the roots.
Rhizoctonia root rot manifests itself in foci in the form of attacks and weakening of seedlings and seedlings. Seedlings of affected plants are colored brown and are distinguished by softened tissues. The phytopathogen infects roots, coleoptile, leaf sheaths and lower leaves. Roots become rusty when affected. They form mycelium and sclerotia, which look like crusts. Eye-shaped spots appear on leaf sheaths, 15-25 cm long, with dark brown rims. The basal part of the stem is covered with lanceolate spots. Affected plants usually die. Surviving, they lag behind in development and give a low yield.
The regional Rosselkhoztsentr for the treatment and prevention of rhizoctoniosis root rot of wheat, farmers are recommended to carry out treatments with biofungicides.
Full version on the website Effective methods of protection of winter wheat crops from rhizoctonia root rot
