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Classic Ozone Injury on Milkweed
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
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