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
