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Powdery residue on olives

10 years ago
last modified: 10 years ago

I have several Little Ollie dwarf olives in pots that have developed a whitish, powdery coating on the leaves. Trying to figure out what it is. Powdery mildew? The residue can be rubbed off with a wet cloth to reveal the nice green color underneath. I'm in the Los Angeles area, zone 21.

How the leaves look:

Same leaves as above after I cleaned off the leaf on the upper right:

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