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Old February 8, 2018   #10
loulac's Avatar
Join Date: Feb 2013
Location: France
Posts: 505

Copper in recommended doses is not toxic but as it will stay in the earth concentration can become very high. Bordeaux vineyards have been using it for nearly a century and some have huge problems. If we want to leave a clean earth to our children we should think twice before spraying it as long as other substances are efficient and biodegradable.
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