Cherry & Plum Spray Guides
Visit and download the orgnaic spray guides from Integrated Fertility Management web site http://www.agecology.com/guides/pmcherr ... b6eb042acc
With a name like thqat they have to be good.
As for the apple, if you want only one tree you need a self-fertile apple. HOS has printed in the Pome News a list of self-fertile apples.
Semi-dwarf means??? The question is how large or small do you want your tree. If we know that information, then a rootstock can be suggested to give you a tree near that size. Yes you can always prune the tree to the size that you want but I have found that size genetics will win the the end.