Roses
Q.

black spots on roses

Zone Beaverton Oregon 97006 | Anonymous added on April 30, 2019 | Answered

I purchased Mancozeb fungicide to stop the black spots on my rose leaves. It came in a pint bottle and the instructions just say to spray it on. There were no instructions that says just spray it on or dilute it. So I put it in a spray bottle and it wouldn't spray. Then I bought another spray bottle and it is still too thick to spray on. How am I supposed to put it on if it is too thick??? Am I supposed to dilute it or what/how to apply.

A.
A.Answers to this queston: Add Answer
Downtoearthdigs
Certified GKH Gardening Expert
Answered on May 1, 2019

I can't speak to the products that you have or any application instructions; you will need to contact the manufacturer for any questions.
However these links are what we suggest for treatment of Black Spot disease.

https://www.gardeningknowhow.com/ornamental/flowers/roses/black-spot-roses.htm
https://www.gardeningknowhow.com/plant-problems/disease/black-spot-fungus.htm

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