After harvesting root crops (beets, carrots, turnips) are stored in the fields or in the processing enterprises warehouse areas. Storage takes place in open space, and not always under shelters. Bulk heaps are formed from the collected root crops. Harmful microflora may occur in it under the influence of various weather conditions. This article discusses the root crops quality reducing issues. The raw materials quality deteriorates due to the development and increase in damaging fungal diseases. This leads to raw materials losses and a decrease in the processing plants productivity. The subject of the study is the storing root crops process. The fungal diseases six types distribution analysis results are presented. Its development patterns are revealed. The damage to root crops in bulk heaps intensity dynamics mathematical models are proposed in the article. Possible ways to normalize climatic conditions when storing root crops in heaps are given.