Today, I noticed in two separate locations, several large, well-established live oaks covered in aphids and honeydew. The honeyew can be spotted from a good distance, and in both locations it was a complete infestation. I have never seen this before. Is this common because of warm winter we have experienced? What should be done to treat them?

Anytime I find a critter on my trees I don't want (which admitedly hasn't happened in forever because of regular foliar sprayings of food and such) it goes away after an application of Garlic Pepper tea.

In warmer weather, when there's no chance of them freezing out, releasing ladybugs is a major help too. Used o do that on my apple trees when they were new nad slightly stessed in the spring.

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Shepherd of the Trees
It is not our part to master all the tides of the world, but to do what is in us for the succor of those years wherein we are set, uprooting the evil in the fields we know so that those who live after may have clean earth to till.