I have an English Walnut tree. The nuts develop a
black spots in July which go clear into the middle of the nuts
while the outer shell is still green and on the tree. Is there
anything that can be done to prevent this? This happens ever year.
The tree is large and looks healthy. I have never gotten a crop off
of the tree.
For walnut anthracnose, the following suggests raking the leaves,
fertilizing, and fungicidal control:
Anthony R. Brach
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Update: June 2012