Name: Ingrid W.
I have an English walnut tree that produces many walnuts
each year. Before the walnuts get ripe many of them get black spots on
the hull that are mushy. Those walnuts are usually not good when
ripened. Can you tell me what causes this and how to prevent it?
I live in the high desert of California where the climate is dry and
summer temperatures get into the high 90's. The winters get cold and we
have some snow most years.
The following might be helpful
Anthony R. Brach, Ph.D.
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Update: June 2012