Galls on twigs of a grey box. The galls are about 4mm wide on twigs about 1mm wide, and light green underneath. There were several groups like the one shown on the same waist high sapling. The largest group about 100mm across. Most of the stunted leaves attached to the galled twigs had conical galls on the underside, about 1.5mm high (see third photo). These appear to be associated since they do not appear anywhere else on the sapling.
The first photo shows some lerps and what I assume is a psylid nymph. Psylid nymphs except for the first stage crawlers should not normally be seen but I read that sometimes they move to a different location to feed, which would make sense since the leaf seems to be quite badly damaged. Other photos show what appear to be newly emerged adults on the same red gum sapling. I assume the orange ones (about 2mm long) are female and the tiny black ones (about 0.5mm) male, but this is just a guess they could be something completely different. There were masses of lerps on this sapling and most still had nymphs in them when the photos were taken