This article provides information on the distribution and dangers of Alternaria that affects vegetable crops, and on measures to combat it, on fertilization. During the scientific work carried out in the course of the study, the fungi were divided into species and forms based on their microscopic characteristics. Methods of using fungicides used in chemical methods of combating Alternaria are shown. The article presents scientifically substantiated methods of timing and norms for the use of seed preparations when using methods of combating potato Alternaria.