have a large old plum tree which while past its best is a great feature in the garden and removing it isn't an option.

anyway last year aphids thrived especially when i went away on holiday in early for two weeks. so much so that the tree suffered leaf curl and to be honest i was worried it were dead.

thankfully it survived although minimal flowers this spring and i've already sprayed once to keep those aphid in check. however 15-20% of the tree's stems/branches are dead and i'm wondering whne is the best time to prune.

no idea what variety it is, and the book i have says august, but i think i remember someone on here saying end of April?

Thanks 4 the advice

Matt