Until recently, the Copper 53 W label indicated a warning “Do not use on vinifera varieties.” This caused some consternation for grape growers as it had routinely been used on vinifera grapevines worldwide for decades without issue. To address this, the label was updated April 2026 to read “Copper 53W Wettable Powder should be used with caution on vinifera varieties.”
Caution should be used with almost all copper fungicides. If the copper ions stay in solution for an extended period of time (i.e. under slow dying conditions) more of them will be able to pass through the cuticle and burn leaves.
For more information on copper, check out Clearing the Cobwebs: Copper Use for Grape and Stone Fruit Diseases ONFruit.
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