mickeblue said:

can anyone help me out with a problem on my plum trees?

http://homepage.ntlworld.com/mickeblue/plums.html

The most immediate suspect is the plum curculio. This weevil lays its eggs
on stone fruit and apples, leaving small cresent-shaped scars. The larvae
feed inside the fruit. The damaged fruit is then subject to various rots.

See:
http://www.uky.edu/Agriculture/Entom...ruit/ef202.htm

The control info here is short but very much to the point:

http://ohioline.osu.edu/hyg-fact/2000/2043.html
--
Pat in Plymouth MI

Any technology distinguishable from magic is insufficiently advanced.
(attributed to Don Marti)