Quince Rust on Crab Apple and Hawthorn: Organic Atomic Grow

Quince Rust on Crab Apple and Hawthorn: Organic Atomic Grow

Orange, powdery spores on Sargent crab apple fruit and spreading to Washington hawthorn indicate quince rust (Gymnosporangium clavipes), a fungus requiring juniper/cedar alternate hosts. Rainy springs favor infection. Copper sprays failed because timing or coverage was inadequate.

Organic Approach

Atomic Grow, sprayed on foliage and drenched into the root zone, has cleared rust on figs and other plants. It boosts plant immunity and disrupts fungal cycles organically.

Application

• Foliar spray: every 7-10 days during wet spring weather.
• Soil drench: 20 tsp per 5 gallons water, monthly.
• Remove nearby juniper/cedar if feasible to break the disease cycle.

Safe for koi ponds and pollinators.