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

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Snapdragon > Leaves > Malformed, cupped or distorted leaves

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Credit: Mary Ann Hansen, Virginia Polytechnic Institute and State University, Bugwood.org
Credit: Michelle Grabowski, University of Minnesota Extension
Credit: Elizabeth Bush, Virginia Polytechnic Institute and State University, Bugwood.org
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Powdery Mildew
Oidium sp.

Powdery, fluffy white spots and blotches on leaves, stems, and flower parts
Tiny black round spheres may be visible within white spots late in the season
Spots typically start on lower leaves but can spread to cover the entire plant
Severely infected leaves may be completely covered in white or grayish white fungi
In some cases, leaves become curled or twisted or turn yellow due to the infection
More information on Powdery Mildew

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Credit: Michelle Grabowski, University of Minnesota Extension
Credit: Michelle Grabowski, University of Minnesota Extension
Credit: Clemson University - USDA Cooperative Extension Slide Series, Bugwood.org
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Plant growth regulator herbicide injury
(2, 4-D, Dicamba, etc.)

Leaves are twisted, cupped, or distorted
Leaves may appear thick and leathery
Veins in leaves are thick and close together
Side of the plant closest to the herbicide application is most severely affected
Different species of plants in spray area will show similar symptoms
More information on herbicide injury

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