Extension > Fruit > Apple > Spots/blotches are smooth
Apples > Fruit > Spots/blotches are smooth
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Plum Curculio
Conotrachelus nenuphar
- Fruit can drop prematurely
- Adult weevils lay eggs in the apple resulting in distinctive crescent shaped tan spots on the apples
- Adult weevil is small (1/5" in length), dark brown with whitish-gray patches, bumps on the wings, and a distinctive downward-curved snout
- Mature larvae are yellow-white, ¼" long, and c-shaped (rarely seen)
- Adults active in early spring (during bloom)
- More information on Plum Curculio
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Sooty Blotch
(many species of fungi)
- Fruit develops gray, green, brown, or black blotches on the surface of the fruit that can easily be washed off
- Infection is superficial and does not rot the fruit
- Commonly occurs with fly speck
- Common in August and September
- More information on Sooty Blotch
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Flyspeck
(many species of fungi)
- Fruit develops distinct clusters of pin-point size black dots that do not wash off
- Infection is superficial and does not rot the fruit
- Commonly occurs with sooty blotch
- Common in August and September
- More information on Flyspeck
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Black Rot
Botryosphaeria obtusa
- Fruit is rotted but remains firm
- Fruit may become mummified and remain on tree
- Round leaf spots with a purple border and tan center
- Large brown spots with brown rings form on fruit
- 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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White Rot
Botryosphaeria dothidea
- Sunken brown spots on fruit, can grow to rot part or all of fruit
- Fruit rot is soft, watery and extends to the core of the apple
- Small blister like spots on branches exude, watery fluid
- Branch infections grow to cracked, flakey, orange canker
- Leaves on girdled branches wilt, die and turn brown
- More information on White Rot
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Sunburn
- White, tan or yellowed patches found on the sun exposed side of the fruit
- More common on fruit on the southwest quadrant of the tree
- Can be more pronounced under drought-like conditions
- More information on Sunburn
