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Home > Annuals and Perennials > Astilbe
Astilbe
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fourline bug 1
Credit: Jeff Hahn
fourline bug 2
Credit: Jeff Hahn
fourline bug 3
Credit: Jeff Hahn
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green arrowFourlined plant bug
Occurs May to early July
Feeding causes brownish or sunken spot on leaves
Nymphs are red or red and black; Adults greenish yellow with 4 black strips, 1/4 to 1/3 inch long
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heat stress 1
Credit: Michelle Grabowski
heat stress 2
Credit: Michelle Grabowski
heat stress 3
Credit: Michelle Grabowski
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green arrowHeat 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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powdery mildew 1
Credit: Michelle Grabowski
powdery mildew 2
Credit: Michelle Grabowski
powdery mildew 3
Credit: Michelle Grabowski
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green arrowPowdery 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
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herbicide 1
Credit: Michelle Grabowski
herbicide 2
Credit: Michelle Grabowski
herbicide 3
Credit: Michelle Grabowski
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green arrowHerbicide 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 severely affected
In severe cases the entire plant may be affected