Abstract
In recent years, losses due to sooty mold fungi have increased massively in organic apple cultivation in South Tyrol. Until now, there was no large-scale practicable known way of regulating them in the field. In field trials in 2021 and 2022, various substances that can be used for organic apple cultivation were tested for their properties to regulate the pathogenic fungi. In analyses after harvest and after 3 months of storage, in cold storage, a product based on sulphuric acid clay achieved acceptable results.