North American Fruit Explorers mailing list at ibiblio

["Kieran &/or Donna" <holycow@frontiernet.net>]

Pears and quince roots they might be grafted on get along just fine with 
walnuts.  Of course if the walnut tree was simply very big and blocked out 
light or took up all the water and nutrients, that's a different matter. 
Apple and blueberries on the other hand, need to be a good 70 ft from any 
large walnut tree.  Donna