Baz wrote:
My 2 cherry trees are riddled with blackfly at the tips on new growth.

Ours were last year, not so bad this year. Obv. all headed for the plum
instead.

Sickening, isn't it!

It is a bit. Last year we were happy to get 6 plums, with the expectation of
more this year. And now we have zilch. :'(