Chemical forms of copper on leaves in relation to the bactericidal activity of cupric hydroxide deposits on plants

The total amount of copper, the amount of soluble but complexed copper, and the concentration of free Cu 2+ ions on the surface of navel orange and bean leaves treated with different amounts of Cu(OH) 2 or Bordeaux mixture were determined under field conditions. Total copper deposits decreased with time after spray application with apparent first-order kinetics with a half-life of approximately 45 and 35 days on navel orange and bean leaves, respectively (...)