Rose plant leaves has white spots - Knowledgebase Question

Richmond hill, ny
Avatar for southgirl523
Question by southgirl523
August 4, 2007
My rose plant leaves has white spots but is still flowering.

Answer from NGA
August 4, 2007
Unfortunately, based on your description I am not certain what is happening to your rose. Sometimes a chemical spray or dusting will leave a residue that looks like white spots, these can be rinsed off with water from the garden hose.

Or, your rose might be suffering from powdery mildew. This fungal infection leaves a white powdery layer on the foliage and the foliage tends to be distorted as well. This can be treated with a baking soda based fungicide such as Remedy.

Or, it might be evidence of a pest problem such as thrips.

Since this type of damage is difficult to diagnose long distance, I would suggest you consult with your local Cornell cooperative extension to obtain a more specific identification of the problem. Based on knowing that, they can help you decide what to do. If a chemical control is needed, they will have the most up to date information on what to use and how/when is best to use it for maximum results.

I hope it is nothing too serious.

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