Power of Attorney for Rubin J. McDougal

This filing relates to a Power of Attorney executed by Rubin J. McDougal on April 29, 2026. This document authorizes Timothy J. Donnelly and Lucy Cooney to act as McDougal's attorneys-in-fact. They are empowered to sign and file all necessary Securities and Exchange Commission forms, specifically Forms 3, 4, and 5, concerning beneficial ownership of securities for American Vanguard Corporation. This is in compliance with Section 16(a) of the Securities Exchange Act of 1934. The Power of Attorney remains in effect until revoked in writing by McDougal. A copy of this Power of Attorney is being filed with the SEC.