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Disease of walnut tree - yellow spots

Pest county, near Budapest, Hungary Hu

Our walnut tree developed a conditiow with yellow spots all over the leaves last Summer. Will it harm the tree? What is it? Do we need to treat the tree to prevent a recurrence?

On plant Juglans




I think your tree has Downy Spot - yellow spots on the upper leaf surface and white powdery mildew on the underside ?
If it is this then there is no need to do anything. Apart from looking unsightly it will not harm your crop.

11 Feb, 2008


I am not sure this is downy spot. Looks more like Leaf Gall Mite damage to me if the spots are raised as they appear to be. See:

If so this seems to be cosmetic only and not too harmful to the tree.

6 Jul, 2009

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