Tools for Managing Sour Rot in Grapes, Dr. Wendy McFadden-Smith
Sour rot has been a challenge in some vineyards this fall. It is critical to manage not just the causal organisms but also the Drosophila flies (spotted wing Drosophila as well as Drosophila melanogaster, the common “fruit fly) that can carry them.
Optimizing drying conditions and minimizing fruit injury are critical. Research in Ontario and New York has shown that applications of antimicrobials such as potassium meta bisulphate (KMS at 5 kg/1,000 L) or peroxide (Oxidate) in combination with insecticides were the most effective way to manage the disease.
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