What's wrong with my plant? : Garden : University of Minnesota Extension

Crab Apple > Leaves > Spots on leaves

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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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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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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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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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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