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Classic Ozone Injury on Milkweed

Ozone damaged leaf

Ozone damaged leaf

Check out this leaf. It has all the signs of classic ozone injury. Check for:

  • stipples (black dots), only found between the veins, not on them
  • stipples are only found on the upper leaf surface
  • stipples have distinct, sharp edges
  • no haloes or discoloration around the stipple
  • black or very dark in color; colors are not variable
  • stipple is scattered over the leaf surface not clustered in groups or in obvious shapes, such as circles

    Next Slide - Aphid Damage >>



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