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Or should I use neem oil instead when there is fruit on the tree as a fungicide? I meant fig fruit.
I would follow the lable. Copper might be easier to wash off, neem leaves more residue. Both are used in organic farming, so what's a little heavy metal gona' hurt? ;)
This may be useful for you.http://www.freshplaza.com/article/147410/Brazil-Copper-sulphate-powder-on-powdered-figs-to-disappear
I spray my tomatoes with copper, I just wash the fruit. Remember too, that we could not live without copper. Not that we need a lot, but we do need it. Supplements are for sale at vitamin stores, Amazon etc. https://smile.amazon.com/Swanson-Copper-300-Tabs/dp/B00068TSEK/ref=sr_1_3_a_it?ie=UTF8&qid=1493576648&sr=8-3&keywords=copper%2Bsupplements&th=1