Up to the present time copper-based pesticides are permissible in organic farming.
First, any alternative to organo-tin anti-fouling paint could be worse, because yachtsmen would be forced to go back to the old-fashioned copper-based anti-fouling.
We have estimated that some 250 million euros would be saved in the supply of coin blanks due to the lower cost of stainless steel alloys compared with copper-based ones.
It is known that some fishermen find that copper-based anti-fouling is not effective for their purposes, and they lace the copper-based anti-fouling with mercury or arsenic.
That is the case with copper-based pesticides.
Fewer than 10% of organic farmers use botanical insecticides on a regular basis, 12% use sulfur, and 7% use copper-based compounds.
Ammonia can also accelerate the corrosion of copper-based alloys found in the water pipes.
Commercially, a liquid copper-based spray can be sprayed on the stems and both sides of the leaves to prevent fungal problems before they occur.
