Question
they are bushes , not trees
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Followup To

Question -
we have 4 varigated dogwood bushes..we have the onset of pink leaves....this happened to two others and we lost them......we "shotgunned" them with a "cocktail" of fungus control and insect control...and also fertilized with miracle grow..........what does this sound like?

Answer -
Hi Mike,
Thanx for your question.  I'm not really experienced with trees however, I found this link that I think you may find some value.  If not, let me know and I'll see what else I can fine.  
Tom

http://www.ces.ncsu.edu/depts/pp/notes/Ornamental/odin23/od23.htm

Answer
Hi Mike,
Thanx for the follow up.  I have done a ton of research on this.  I have my own ideas too.  The onset color of the leaves, I believe, has nothing to do with what eventually developed into the demise of some of your "bushes".  I know nothing of your soil conditions, where you live and what the weather conditions are there, rain fall etc.  Therefore, it is impossible for me to give you a straightforward answer.  One think I think would help is for  you to tell me you state and county and I can refer you to the Extension Service and they may be able to give you the answers for which you are looking.

thx,
Tom