Anastomosis groups and sensitivity to fungicides of Rhizoctonia solani strains isolated from potato in Russia

Journal of Plant Diseases and Protection - A survey of Rhizoctonia solani isolates from potato tubers and stems grown in European and Far Eastern regions of Russia in 2012–2020 was conducted....     

Colletotrichum coccodes in potato and tomato leaves in Russia

Journal of Plant Diseases and Protection - Colletotrichum coccodes is a plant pathogenic fungus affecting different organs of potato, tomato, and some other plants. The leaf infection with C....     

Dielectric characteristics of soils and categories of soil water

The complex permittivity of the Ap horizons of a leached chernozem, gray forest soil, and soddy-podzolic soil, as well as those of kaolin and its mixtures with sand, was studied by the capacitance method. The relationships between the characteristics of losses (the imaginary component ?″ and the loss tangent tan δ) and the water content (W) are more indicative of changes in the water categories than the analogous relationships of the real component (?′), which characterizes the relaxation capacity of water molecules. The breakpoints on the curves tan ?′ = f(W) and ?″ = f(W) are more pronounced compared to the curve ?′ = f(W) and better agree with the soil-geological constants: tan δ = f(W) at the W value close to the wilting point (WP) for all soils and at the maximum water adsorption capacity (MWAC) and maximum capillary sorption capacity (MCSC) for kaolin and its mixtures; ?″ = f(W) at the MWAC, WP, and maximum molecular water capacity (MMWC) for the leached chernozem and soddy-podzolic soil. On the curve ?′ = f(W), breakpoints were observed only for the gray forest soil and sand-clay mixtures.