Tiny yellowish‑green bugs on leaves and stems are almost certainly aphids. They reproduce rapidly but are easy to kill with a contact spray.
Mix 5 parts water, 1 part 70% rubbing alcohol, and a squirt of liquid dish soap. Spray until every surface is dripping wet. One thorough application usually eliminates them.
Plants don't get the plague. Your avocado's problem needs a detailed description: indoor/outdoor, size, pot, light, symptoms, watering routine. With that information, a proper diagnosis is possible.
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