Copper deficient plants have chlorotic younger leaves, stunted growth, delayed maturity, excessive tillering, lodging and sometimes brown discoloration. Copper deficient plants are prone to increased disease. 
 
Copper deficiency in barley
(photo courtesy of PPI)
Copper deficient wheat
Copper deficiency in wheat
(photo courtesy of PPI)
yellow brown leaf tips of copper deficienty wheat
Copper deficiency in wheat
(photo courtesy of PPI)
yellow poorly filled grain heads of Cu deficient wheat
Copper deficiency in wheat
(photo courtesy of PPI)
copper deficienty wheat leaves
Copper deficiency in wheat
(photo courtesy of PPI)
copper deficienty wheat leaves
Copper deficiency in wheat; brown discoloration in the field.
(photo courtesy of R. Engel)
brown discolored wheat grain in section of field with copper deficiency