Rhizoctonia potato disease in production conditions in the forest-steppe of Western Siberia

The authors carried out a scientific study from 1990 to 2022 on 20 varieties of potatoes the pathogenesis Rhizoctonia in crop production conditions and substantiate methods system protection against disease. fungus R. Solani persists annually soil seed tubers form mycelium sclerotia. It was found that more than 60% grounds potato agroecosystems have content causative agent is many times higher established ETH (Economic threshold harmfulness). Furthermore, monitoring phytosanitary state material showed that, average, about are inhabited by Rhizoctonia, including 30% sclerotial form, which six regulations. Thus, region’s conditions, double mechanism phytopathogen transmission provided annually. infects sprouts, subsequently causing their complete death (on average 12%) shootouts, reducing density productive plants plantings. At subsequent stages growth development potatoes, significant expansion disease stems noted 31.4%), stolons were damaged died (9.3 5.5%, respectively), disrupted processes stolon tuberization. In occurs epiphytotic with prevalence 88% or more. Therefore, strategy should be based reduce initial population soils tubers. Essential elements cultivation technology cropping rotation saturation no (biological efficiency - 43.2–79.5%); precursor, green manure pairs 49.0–75.9%); mandatory etching chemical preparations 54.9–98.8%) natural origin. Using entomopathogenic fungi Metarhizium robertsii Baeuveria bassiana can promising direction Rhizoctonia. Dressing conidia suppressed plantings 1.8–3.7%, providing an increase yield 12.1–19.2%. influence will continued.