Formulas for calculating plant disease affection using oil crops of the Brassicaceae family as an example (overview)

The study of plant diseases involves determining the species composition of pathogens and crop resistance, as well as the statistical processing of survey data. This article presents formulas used by Russian and foreign scientists for many years to calculate the incidence and development of plant diseases. The article provides formulas that are generally accepted for calculating the harmfulness of diseases, the biological effectiveness of fungicides during testing, and the influence of meteorological factors on the incidence and development of plant diseases. When studying soil micromycetes in a laboratory, formulas are used to determine the number of colonyforming units (CFU) of fungi in one gram of absolutely dry soil, the number of genera present, their occurrence, and the similarity of biotypes. These formulas also used to calculate the growth rate of micromycete mycelium. Researchers statistically process data using methods described by various authors, but most often they use the formulas presented by B.A. Dospekhov (1968, 1988). Applying the formulas presented in this article contributes to a more complete understanding of the influence of diseases on oil crops of the Brassicaceae family.