Posted: 24/09/2016 at 12:50
Looks like an extremely severe infestation of scale insect. I would normally recommend rubbing them off or dabbing with methylated sprit but it looks too severe for that. Spray it with Provado systemic insecticide which will be absorbed by the tree and will kill the insects. A second treatment may be needed in a few weeks.
Last edited: 24 September 2016 12:51:14