Why Would Walnuts Be Moldy On The Inside When Cracked?
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?
Certified GKH Gardening Expert
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