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Rust in Apple Tree
How to identify and treat rust in Apple Tree.
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Apple Tree care requirements
water
Regularly when young. Water deeply in drought.
soil
Well-draining, fertile soil. pH 6.0–7.0.
light
Full sun — 8+ hours for fruiting.
symptoms
Symptoms to look for in Apple Tree
Bright orange-yellow spots on the upper leaf surface with corresponding raised, spiky orange growths on the underside, often leading to early leaf drop.
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Common causes in Apple Tree
Apple rust (cedar-apple rust) requires a nearby juniper or cedar tree to complete its life cycle, alternating between the two host species each year — spores travel considerable distances on the wind between hosts.
healing
How to treat rust in Apple Tree
Remove and destroy heavily infected leaves, and apply a fungicide labelled for rust in spring if junipers or cedars are present nearby and infection is recurring.
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Preventing rust in Apple Tree
Where possible, avoid planting apple trees near junipers or cedars, and choose rust-resistant apple varieties in areas where the disease is common.