Strategies to reduce sooty mould in organic apple production

Sooty mould in organic apples results from seasonal pathogens, causing dark fruit spots that worsen during storage. Linked to high humidity, leaf wetness, aphid honeydew, and poor orchard management, control relies on cultural practices: pruning for airflow, mowing grass under rows, avoiding overhead irrigation and nitrogen fertilisers, and removing mummified fruit. Field covers like the Keep in Touch System reduce infestation; post-storage brushing removes spots. Copper, lime sulphur, potassium bicarbonate, and soap-based sprays are used with variable efficacy; overuse may promote Neofabraea spp. The Laimburg Research Centre (Italy) published this 2023 practice abstract within the BIOFRUITNET project, available in English (USA), German (Switzerland), and Italian on Organic Eprints.