Plum Tree infestation and cut back
I have a plum tree which is about 5 years old or so. This year it's not produced any fruit and has become heavily infested with greenfly/whitefly. I've chosen to cut it back by about 75% and open it up and just leaving a few branch's/twigs with some foliage on them. The wife thinks I should just leave the branch's etc with nothing on but think it would be better to leave it as it is now. What should I do??