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Walnut Trees

Q.Why Would Walnuts Be Moldy On The Inside When Cracked?

Zone 37355 | tammyhs added on November 2, 2019 | Answered

We bought property with 2 mature grafted walnut trees. We didn’t have any fruit last year because of a late spring freeze. This year, we had plenty of nuts, but when cracking them open, 80% of them were moldy on the inside. No sign of breach in the shells. What would cause this? Is there any way to keep it from happening next year?

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Certified GKH Gardening Expert
Answered on November 4, 2019

It sounds like a very common Walnut blight, Xanthomonas juglandis

This website will help: https://www2.ipm.ucanr.edu/agriculture/walnut/Walnut-Blight/

This article will help with fungicide use: https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

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