Its intake in Wilson’s disease patients can accumulate to levels that lead to liver disease and mental retardation. One cautionary note: people with Wilson's disease, an inherited genetic disorder, cannot properly excrete copper. Absorbed in excess (more than 20 milligrams a day), it can lead to vomiting. National Research Council recommends 1.5 to 3 mg of copper per day for adults to avoid copper deficiency. Copper is a natural element that is an essential trace mineral for humans. But residue can be washed to reduce or eliminate copper fungicide traces. According to officials at Cornell University’s Department of Plant Pathology, copper is strictly a contact fungicide (versus systemic fungicide), meaning it impacts plant and fruit surfaces only, not the tomato’s interior. There are no restrictions on the total amount that can be applied to a crop over a season. The EPA recommends a defined concentration range for fungicide application. there are no human toxicity concerns associated with tomatoes treated with copper spray. government’s Environmental Protection Agency (EPA) routinely reviews fungicides and their safety. Long answer: Copper is one of the most commonly-used fungicides for treating tomatoes organically. Washing will remove residue and there is no waiting period after treating or harvesting. Short answer: yes, you can safely spray fruit-bearing tomatoes with copper fungicides. I would appreciate any information you can give me. Will washing remove the spray from picked fruit?.However, the season has got away early, and I have fruit on very healthy plants already. This year I was determined to spray with copper oxide to prevent it. ![]() I get tomato blight regularly every year. Harvesting Tomatoes After Spraying with Copper
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