Help - bumps on branches of olive tree
I was given an olive tree a few months ago as a gift and it's potted in our conservatory. Whilst watering it today I noticed there are closely clustered bumps/ scales on the branches and these are brown, yellow and the odd clear one. There is also sticky clear substances (like sap?) on some of the leaves. There also seem to be a few tiny insects flying around the base of the plant.
O have no idea what this is or how to treat it. I really don't want to lose the tree for sentimental reasons. Can anyone offer any advice or tips on how to deal with this?
Many thanks in advance