Cultural Problems
Edema on ivy geranium
Note the symptom similarities. Edema and mite injury on Ivy Geraniums are often mistaken.
Edema is a physiological condition caused by an imbalance of the plant's water uptake and water loss. It develops when the plants roots absorb water at a faster rate than it is transpired through the leaf cells. The enlarged leaf cells divide, and then rupture. This rupturing of the leaf epidermis and inner cells causes the raised blisters commonly seen on the underside of leaves.
“Managing Edema on Spring Crops”
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