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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Annuals and Perennials > Astilbe

Annuals and Perennials > Astilbe

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  • fourline bug 1
    Credit: Jeff Hahn
  • fourline bug 2

    Credit: Jeff Hahn

  • fourline bug 3

    Credit: Jeff Hahn

  • - CLICK PHOTOS TO ENLARGE -

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 are greenish yellow with 4 black stripes, 1/4 to 1/3 inch long
  • More information on Fourlined plant bug...
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  • heat stress 1
    Credit: Michelle Grabowski
  • heat stress 2

    Credit: Michelle Grabowski

  • heat stress 3

    Credit: Michelle Grabowski

  • - CLICK PHOTOS TO ENLARGE -

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

  • - CLICK PHOTOS TO ENLARGE -

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
  • More information on Powdery Mildew...
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  • Herbicide 3
    Credit: Michelle Grabowski
  • Herbicide 1

    Credit: Michelle Grabowski

  • Herbicide 2

    Credit: Michelle Grabowski

  • - CLICK PHOTOS TO ENLARGE -

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

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