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I am working with the plant species Eucalyptus perriniana (spinning gum) for one of my research projects. A few days into the experiment, I noticed some crusty deposits forming on several leaves (as shown in the attached photographs). I was wondering if anyone here might be able to identify it. I am not sure if the deposits are biological in nature, or if they are some kind of chemical precipitate.Crusty formation on eucalyptus leaf

Crusty formation on eucalyptus leaf

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