What's wrong with my plant? Give us your feedback

Snapdragon > Leaves > Leaves discolored white, yellow or pale green

1 of 3
  • Powdery mildew 1
    Credit: Mary Ann Hansen, Virginia Polytechnic Institute and State University, Bugwood.org
  • Powdery mildew 2

    Credit: Michelle Grabowski, University of Minnesota Extension

  • Powdery mildew 3

    Credit: Elizabeth Bush, Virginia Polytechnic Institute and State University, Bugwood.org

  • - CLICK PHOTOS TO ENLARGE -

green arrowPowdery Mildew
Oidium sp.

  • 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
2 of 3
  • Two-spotted spider mites 1
    Credit: Whitney Cranshaw, Colorado State University, Bugwood.org
  • Two-spotted spider mites

    Credit: David Cappaert, Michigan State University, Bugwood.org

  • Two-spotted spider mites

    Credit: David Cappaert, Michigan State University, Bugwood.org

  • - CLICK PHOTOS TO ENLARGE -

green arrowTwo-spotted Spider Mites
Tetranychus urticae

  • Active during summer, particularly abundant during hot, dry weather
  • Pale stippling appears on the upper leaf surface
  • Leaves are discolored off green to whitish, yellowish, or bronze
  • Premature leaf drop can occur
  • Visible webbing occurs on infected leaves when populations are high
  • Adults are tiny (1/50th inch long) and oval, greenish or yellowish with a dark spot on either side of the body
  • More information on Two-spotted Spider Mites
3 of 3
  • Downy mildew 1
    Credit: Robert Wick, University of Massachusetts, Bugwood.org
  • Downy mildew 2

    Credit: Michelle Grabowski, University of Minnesota Extension

  • - CLICK PHOTOS TO ENLARGE -

green arrowDowny Mildew
Pernospora antirrhini

  • Leaves turn pale green to yellow and may curl slightly downward
  • Downy white fungal growth on underside of leaves
  • Plants become yellow in color and stunted
  • Infected leaves prematurely drop from the plant leaving a barren stalk with few leaves
  • Disease favors cool, wet weather
  • More information on Downy Mildew

Don't see what you're looking for?