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Extension Educationin Calhoun County Texas AgriLife Extension Service Home Welcome to the home page for the Texas AM AgriLife Extension Service in Calhoun County. Our office is located at the Calhoun County Fairgrounds on the western edge of Port Lavaca. Texas AM AgriLife Extension educates Texans in the areas of Texas AM AgriLife Extension is a state wide educational agency and a member of the Texas AM University System linked in a unique partnership with the United States Department of Agriculture Cooperative Extension System and the local County governments in Texas. Asian Giant Hornet About the murder hornet or Vespa mandarinia The Asian giant hornet Vespa mandarinia or AGH is a large predaceous hornet native to Asia most commonly found in Japan and South Korea.