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Dear gardening enthusiasts,
I'd like to ask for your advice. My 3-years old avocado, planted in a pot, has some problems, please see attached photo of one of its leaves' both sides. Since several days I began to notice these black spots accumulating along the leaves veins, then the leaves turn brownish and fall off. The avocado has already lost several leaves. A Google-search gave no results, maybe some of you have experience similar problems and could share your experience. Thanks!
I can see black deposits on the underside of the leaf in the top picture - the black along the rib on the topside appears to be in the same place as the insects on the back. I can't tell what they are, the photo doesn't get clearer under magnification, but it could be blackfly or mites or something, have a look with a magnifying glass. Some kind of insecticide treatment is called for - neem might work, but best to determine quite what the insect is.
