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Ck from Kirkland, Wa writes

How often can I spray Bonide Liquid Copper Fungicide Concentrate on rose bushes? What is the rate for black spot?

Answer:

Bonide Liquid Copper Fungicide Concentrate can be applied every 7-10 days if used as directed. It is mixed at 1.44 fl oz per gallon of water for black spot.

Answer last updated on: 07/09/2019

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