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Heya guys does anyone know if Episyrphus balteatus ever uses heavily decomposed rot holes as pupation sites? I've seen the pupae on leaf blades online so am a bit confused. I've found quite a lot in Fraxinus today with the pupae also! I'm guessing that the tree was heavily infested with aphids? I received a limb with heart rot all through the middle and the adults emerging on mass and dying. Its almost like they emerged through stress.