Extension > Garden > Diagnose a problem > What's wrong with my plant? > Fruit > Apple > Spots on leaves
Apples > Leaves > Spots on leaves
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Apple Scab
Venturia inaequalis
- Olive green to brown leaf spots with an irregular or feathered edge, eventually becoming a dark brown to black
- Infected leaves turn yellow and drop prematurely
- Brown raised corky spots on fruit
- Severely infected fruit may be deformed and cracked
- More information on Apple Scab
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Cedar-Apple Rust
Gymnosporangium juniperi-virginiana
- Leaves develop yellow, then bright orange spots with a red border
- Small raised black dots may be present on the upper side of leaf spots, fringed tubes may be seen on the underside of the leaf spots
- Rough green to brown irregular spots on fruit, do not extend deep into the fruit
- Juniper bushes have brown 1/4 – 1 inch round woody galls, that produce bright orange tentacles in wet spring weather
- More information on Cedar-Apple Rust
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Black Rot
Botryosphaeria obtusa
- Round leaf spots with a purple border and tan center
- Large brown spots with brown rings form on fruit
- Fruit is rotted but remains firm
- Fruit may become mummified and remain on tree
- Branch cankers can be sunken, reddish brown or rough looking or cracked bark; cankers may remain small or enlarge to become several feet long
- Leaves on girdled branches wilt, die and turn brown
- Common on stressed trees and trees infected with fire blight
- More information on Black Rot
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Powdery Mildew
Podosphaera leucotricha
- Part or all of infected leaves are covered in white-gray, felt-like patches
- Infected leaves will curl, twist, or fold upward
- Infected blossoms are distorted, discolored, and covered in white powdery fungal growth
- Infected fruit have bronze, corky streaks, that are skin deep
- More information on Powdery Mildew
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Spotted Tentiform Leafminer
Phyllonorycter blancardella
- Feeding by larvae in between the leaf surfaces results in small, oval, spot-like “mines”, opaque at first, later turning brown
- This can reduce photosynthesis, resulting in diminished fruit set and quality, and can also cause premature leaf and fruit drop when leaves are severely infested
- Adult moth is small (1/10”), slender, brown, with distinct gold, black, and white wing patterns; They are present from early May – September
- Larvae are yellow-green and small (1/10” in length when mature); they are present from late May - August
- More information on Spotted Tentiform Leafminer
