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Zinnia > Leaves > Malformed, cupped or distorted leaves

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  • Plant growth regulator herbicide injury 1
    Credit: Michelle Grabowski, University of Minnesota Extension
  • Plant growth regulator herbicide injury 2

    Credit: Michelle Grabowski, University of Minnesota Extension

  • Plant growth regulator herbicide injury 3

    Credit: Michelle Grabowski, University of Minnesota Extension

  • - CLICK PHOTOS TO ENLARGE -

green arrowPlant 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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  • Powdery mildew 1
    Credit: Michelle Grabowski, University of Minnesota Extension
  • Powdery mildew 2

    Credit: Michelle Grabowski, University of Minnesota Extension

  • Powdery mildew 3

    Credit: Michelle Grabowski, University of Minnesota Extension

  • - CLICK PHOTOS TO ENLARGE -

green arrowPowdery Mildew
Golovinomyces (syn. Erysiphe) cichoracearum

  • 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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