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

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Annuals and Perennials > Astilbe

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Credit: Jeff Hahn
Credit: Jeff Hahn
Credit: Jeff Hahn
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Fourlined plant bug

Occurs May to early July
Feeding causes brownish or sunken spot on leaves
Nymphs are red or red and black; Adults are greenish yellow with 4 black stripes, 1/4 to 1/3 inch long
More information on Fourlined plant bug...

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Credit: Michelle Grabowski
Credit: Michelle Grabowski
Credit: Michelle Grabowski
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Heat and Drought Stress

Edges of leaves curl upward and turn brown or black
Entire leaves turn brown and dry up
Plants may look thin and ragged
Common in plants that receive too much sun or too little water

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Credit: Michelle Grabowski
Credit: Michelle Grabowski
Credit: Michelle Grabowski
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Powdery Mildew
Erysiphe polygoni

Powdery, fluffy, white spots or blotches on leaves and stems
Tiny raised black dots may be visible within white spots late summer or early fall
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
Credit: Michelle Grabowski
Credit: Michelle Grabowski
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Herbicide Damage
Phenoxy herbicide ex. 2,4D

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 severly affected
In severe cases the entire plant may be affected

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