I have phyllids on my Lilly Pilly's, what can i do to get rid of them?

The best way to control this problem is to:-

1. Prune affected foliage.
2. Spray with a systemic insecticide monthly. (Such as Dimetheoate)

Alternatively replant with phyllid free species such as Acmena varieties and avoid Syzygium Australe species.