Posted: 03/06/2014 at 10:01
My gut feeling, without seeing the trees, is that it's not a spray that the trees need - you've done half the job by removing conifers and allowing sunlight and fresh air to get to them. The conifers will also have dried out the soil and robbed it of nutrients.
Remove grass and other plants from around each tree trunk leaving bare earth diam. 3ft. Feed with Fish Blood & Bone (according to directions on pack) now, again in August and October. Watering it in (3 buckets full per tree) and mulching each tree with organic material, well-rotted manure, garden compost etc. Don't let it touch the tree trunks.
Prune out any dead, diseased or crossing branches to open them out and let the air get to the centre of the trees. Do the pruning this month and this will help avoid any plum or cherry trees from contracting silver leaf disease.
This will enable the trees to grow healthily and they'll be more resistant to any pests and diseased there are around.
I'm sure someone more knowledgeable than me will come along soon and give you more specific pruning advice to encourage fruiting etc.
Hope that's helpful