U of M Gardening Information: What's wrong with my plant?

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Ribes > Leaves > Curled, cupped or distorted leaves

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Credit: M. Grabowski, University of Minnesota
Credit: M. Grabowski, University of Minnesota
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Plant Growth Regulator Herbicide Injury
(2,4-D, Dicamba, etc.)

Leaves, stems, and petioles are twisted, distorted, and/or cupped
Leaves may appear thick and leathery with parallel veins
Youngest tissue at branch ends affected
Distorted growth accompanied by or followed by leaves that turn brown or yellow
More information on Plant Growth Regulator Herbicide Injury...

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Credit: M. Grabowski, University of Minnesota
Credit: M. Grabowski, University of Minnesota
Credit: M. Grabowski, University of Minnesota
- CLICK PHOTOS TO ENLARGE -

Powdery mildew
Phyllactina guttata

White, powdery spots or blotches on leaves
Leaves and stems may be completely covered with white, powdery fungal growth
Leaves may yellow and drop prematurely
Young leaves and shoots may be curled and twisted
Entire shrub may appear gray or discolored
More information on powdery mildew...

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