Clicking here will take you to the EEK! Home Page Clicking here will take you to the Critter Corner Section Clicking here will take you to the Nature Notes Section Clicking here will take you to the Our Earth Section Clicking here will take you to the Cool Stuff Section Clicking here will take you to the Get a Job Section
Clicking here will take you to the EEK! Home Page
.

Is it Ozone Damage?

Ozone damaged leaf

Ozone damaged leaf

Before you go out in the field to look for ozone damage to milkweed, and when you double check your leaf samples back in class, remember to review the classic ozone injury symptoms.

Ozone injury is always:

  • on the upper leaf surface only
  • interveinal (between the veins not across the veins)
  • black in color
  • distinct with sharp edges
  • most pronounced on the older and middle-aged leaves

    Ozone injury will never:

  • have haloes
  • rub or wash off

    And, don't forget that most leaves will have multiple types of damage and that most damage is caused by insects, diseases, nutrient problems or heat stress, rather than ozone.

    Okay, now that you've reviewed the classic ozone injury symptoms, follow this slide show and view different milkweed leaves. Can you tell if it's ozone injury?

    Begin the slide show or >>

    See the list of slides >>



  • . Click here to go to the top of the page
    Clicking here will take you to the EEK! Home PageClicking here will take you to the Wisconsin DNR Home Page
    Clicking here will take you to the EEK! Home PageClicking here will take you to the Critter Corner SectionClicking here will take you to
the Nature Notes SectionClicking here will take you to
the Our Earth SectionClicking here will take you to
the Cool Stuff SectionClicking here will take you to
the Get a Job Section