Disease of walnut tree - yellow spots
By Chrispook
Pest county, near Budapest,
Hungary 
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
11 Feb, 2008
Featured on:
nuts
Answers
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:
http://www.graftedwalnuts.co.uk/pest.ihtml
If so this seems to be cosmetic only and not too harmful to the tree.
6 Jul, 2009
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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