Heavy Metals and Fruit Trees

[Clint Potter]

   I am after a information on the effects of heavy metals in 
the soil on fruit trees.

Are metals like Pb and Cd detrimental to the growth of trees like
apples, peaches and pears? Is there any research on tolerable concentrations
of these elements? Are these metals likely to migrate to the fruit? 
What type of soil test should be done? Is total Pb and total Cd
adequate?

  Thank you for any information or references.

		Clint Potter
		cpotter at ncsa.uiuc.edu