Its hard to say because we can’t see enough detail of these organisms to make a definitive ID. It looks like it could be a sap sucking insect; either: Wooly Aphid – though they aren’t common on Avo (that we know of), or it could be Mealybug. We can’t say if the larger insect is an adult stage of male mealybug, but we don’t really see any adult females that would be ready to mate either. This larger insect could be a beneficial insect preying on the other smaller white organisms, or it could just be a different insect altogether, that happened to be present when you saw it. It does appear as if there may be some feeding damage (again, its hard to see in this photo), so we recommend removing these organisms with a cotton swab or other cloth, and continue to monitor for more signs of them. If you see them again, we recommend you use a pesticidal soap or horticultural oil on the organism directly (you may not need to treat the whole tree). Follow all product label directions to avoid causing damage to plants.
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