Brown Flowers Without Spots
Q: The flowers on my mini rose are all turning brown. There are no spots on the leaves. Can you tell what might cause this?
A: Your roses have botrytis blight. It’s a common fungus, the same one that causes the white mold on strawberries. It loves fresh tissue like the petals on a flower or on a wound after pruning.
Control of the disease is pretty simple. Prune all brown flowers off the bushes, being careful not to shake any spores on the leaves below. Remove all debris immediately.
Spray with a copper-based fungicide or an organic spray that contains Bacillus amyloliquefaciens, such as in Arber Bio Fungicide and Bonide Revitalize. It is important to have a fungicide on the rose before you prune and also when the flower buds just begin to swell.
With attention to detail, cleanliness and using the correct product, the next flowers will be perfect.
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