Plum tree problem
Hi, I'm new to gardening and moved house end of last year and there is a big old plum tree in my garden. It produced a number of plums in the lower branches this summer but a lot of them went bad with what I believe is brown rot. I eventually removed them all last week and also pruned some of the branches while I was at it. I've now discovered I shouldn't have done any pruning at this time of year so hope I haven't done too much harm. The other thing I've noticed is that most of the branches at the back of the tree appear to be dead and covered with a sort of mould. From what I've read this might be lichen but I don't know if I should remove the branches or not. It's quite crowded with other tall growing shrubs at that side but they're in my neighbour's garden so not sure I can do much about that. Any advice would be appreciated.