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Chrysanthemum > Spots on leaves

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

    Credit: Jeff Hahn

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

    Credit: Michelle Grabowski

  • Image: powdery mildew 3

    Credit: Michelle Grabowski

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green arrowPowdery Mildew
Erysiphe cichoracearum

  • Powdery, fluffy white spots and blothces 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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  • Image: southern blight 1
    Credit: Janna Beckerman
  • Image: southern blight 2

    Credit: Janna Beckerman

  • Image: southern blight 3

    Credit: Janna Beckerman

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green arrowSouthern Blight
Sclerotium rolfsii

  • Leaves turn yellow then brown from the edges inward and wilt
  • The base of the stem may be brown or discolored
  • Often seen after warm wet weather
  • Tiny tan to reddish brown hard spheres and white cottony growth can be seen at the base of infected leaves or in the soil around infected plants
  • More information on Southern Blight...

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