I just got this question today from a former student of mine. She was removing the summer plants and noticed an Aphid infestation.
She had asked two other people, one being a plant nursery, and got 2 different answers. That's how it is with gardening. Everyone has an answer usually based on their experience.
Here's how I answered - I have a personal rule of never composting any diseased or bug infested plant - why take the risk? I compost a little more casually than the scientific or bio-dynamic version and I can never be sure if it gets hot enough to kill off the bug EGGS, the disease or bacteria.
What do you all do with bug-infested plants? I would love to hear from you!
Doreen, the Garden Goddess