Copper ions denature proteins, thereby destroying enzymes that are critical for cell functioning. Copper can kill pathogen cells on plant surfaces, but once a pathogen enters host tissue, it will no longer be susceptible to copper treatments. Copper is a foliar fungicide with protective action. The product can be used up to the day of harvest and the label says “ for organic production “. Certain fungicides can cause irritation to the eyes and skin, while others can irritate the throat and respiratory problems like asthma. Copper Compounds - Bordeaux. Prolonged exposure to some fungicide can cause visual and neural disturbances. In its liquid or powdered form it’s most commonly called basic copper sulfate, BSC copper fungicide, CP basic sulfate, or tri-basic copper … Check the label for type of copper … It contains copper soap (copper octanoate). I went looking for liquid copper fungicides and found the Bonide product. Copper sulfate is an inorganic compound that combines copper and sulfate. These compounds can be highly phytotoxic to many fruit crops and must be used with extreme care. A buildup of excess copper is toxic to earthworms, and runoff of copper-based fungicides pollutes water. Impact on Human Health. However, the long-term effects of fungicides in humans … Copper compounds are widely sold as fungicides for orchard and garden use. I checked with the EPA and found some info on the LD50 for copper … Thus, copper sprays act as protectant fungicide…