Pacific flatheaded borer has recently become a pest of concern in walnuts, though it has been known to damage walnuts for a long time. Jhalendra Rijal has been researching its biology and control methods and has provided us with an update on his findings.

Mention of an agrichemical does not constitute a recommendation, merely the sharing of research findings. Always follow the label. The label is law. Find out more at ipm.ucanr.edu.

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Thank you to the Almond, Pistachio, Prune, and Walnut Boards of California for their kind donations. Thank you to Muriel Gordon for the music.