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Of course not! Water is a chemical!!
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Copper is being phased out in Europe as an approved “organic” pesticide for this reason. I personally use copper only for dormant spray on bacterial spot. I used to use it on grapes but I think the synthetic sprays such as myclobutanil are overall relatively less harmful, and do more in one spray than half a dozen copper sprays.
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And it’s mostly flammable gas!
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So you can flame out the voles and treat the grapes all in one application?
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