Subject: What are the symptoms of copper toxicity in plants?

Aside from citrus crops,what is the maximum levels(ppm) of copper in a 
fertilizer that garden vegetables and ornamental plants can tolerate without 
showing signs of toxicity? I've read citrus crops deficient in copper are
 foliar treated with 40 to 80ppm Cu.My interest is in soil applied fertilizer
(with Cu).The literature is 
filled with warning about the phytotoxicity of copper but give no symptoms
 or levels ( consentration ranges ) safe to use.Thank you in advance for
 your heip.RJ Kraemer 

Re: What are the symptoms of copper toxicity in plants?