These official UC-approved guidelines for pest monitoring techniques, pesticide use, and nonpesticide alternatives for agricultural crops are essential tools for anyone making pest management decisions in the field. This guideline covers walnut.
The July 2025 update includes updates to general properties of fungicides used in walnuts, bactericide and fungicide efficacy—conventional products, bactericide and fungicide efficacy—biocontrols and natural products and most effective treatment timing for key diseases pages.