The article is devoted to the study of the problems of reducing the quality of root crops during post-harvest storage in heaps under the influence of harmful microflora. An increase in the productivity of processing enterprises is achieved in two ways: by regulating the microclimate in the formed dumps at the enterprises for processing raw materials; by regulating the delivery of raw materials from the fields for the formation of piles to the territory of enterprises. The subject of research is the process of storing sugar beets at processing plants. The reasons for the loss of beet mass are analyzed. The article describes the use of typical information technologies for solving applied problems of the food industry. As an example of the use of specialized tools and standard means of computer mathematics, the problem of approximating the dependence of temperature in a clump on the growth of colonies of pathogens of clump rot of sugar beet is considered. The initial data was taken from open sources. An example of constructing a mathematical model of the development of pathogens depending on temperature is given. A generalized algorithm for using the nonlinear regression method is presented. To check the quality of the regression model, we used the approximation accuracy coefficient. Various degrees of polynomial approximation are considered. The described technology can be used as a basis for approximating the dependence of the reproduction of pathogens and climatic parameters inside the clamps. This method can be generalized to calculate the intensity of development of other strains of microorganisms.