Hi Lebmung,
I've got a lot of citrus, apples, broccoli, and other plants that are always attacked by aphids this time of year (and later farming ants), so I've been super keen on the aphid infestation on my plants. I've been spraying horticultural oil, neem, etc. to control them. That said, I have yet to find a single aphid on these new Avocado plants. It's about the first time I wished a problem might track back to aphids, since I know how to deal with them. What else might account for the damage?
Thanks for the insights.