Abstract
Glomerella Leaf Spot (GLS) and pre-harvest apple bitter rot (ABR), both caused by fungi within the Colletotrichum gloeosporioides species complex, pose a significant threat to organic apple production in certain areas of South Tyrol. GLS symptoms were first identified in the region in 2020, while ABR was first detected on apples in 2023. This one-year trial on Cripps Pink–Rosy Glow® tested eight organic-approved products (copper, acidic clay (± sulphur), potassium bicarbonate, orange oil, lime sulphur, and Epsom salt) against an untreated control. Thirteen applications were made between June and September. Results indicate copper and acidic clay as key components for GLS and ABR management strategies in organic production. Multi-year trials are needed.