photos taken from 2 leaves and show:
1. Lerp, the protective cover that the nymph (larva of psyllid) produce from the sap of the tree;
2.) Nymph, probably the 5th instar larva after removing protective lerp; I slightly squeezed the nymph when I removed the lerp cover; note the green sap droplet on the side of the abdomen;
3.) Ventral view of a nymph, earlier stage than 2.);
4.) Lerps and exuvia the moulted skin of a nymph.
I assume they are all of the same species.
Ah, thanks Roger there is a little lerp on the 3rd photo which seems to be different from the larger smooth structures; it seems to have a lattice structure. I will go back to see whether I can take better photos and whether there are in fact different species.
I googled and found Cardiaspina sp., the Lace or Basket psyllid that builds scallop-shaped lerps see https://focusonfauna.com/2017/11/18/not-more-about-lerps/ It looks different to the Cardiaspina sp of CNM Cardiaspina