Trial assesses efficacy of biorational products in reducing apple scab and cedar-apple rust, suggesting effective disease management strategies.
Apple scab (Venturia inaequalis) and cedar-apple rust (Gymnosporangium juniperi-virginianae) are both major diseases of apples, causing defoliation and unmarketable fruit. This report evaluates the efficacy of biorational products for the management of primary apple scab and cedar-apple rust on leaves in the early part of the season. The trial was conducted in 2024 in Ames, IA on four biorational products on 2-year-old Malus × domestica ‘Buckeye Gala’ and ‘Golden Delicious’ trees. All treatments reduced disease incidence under high pressure, with cultivar-specific differences in efficacy. Results support further integration of biorational strategies into early-season disease management programs in the Midwest.
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Slack et al. (2025) studied this question.
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