Genus Andricus is the scientific name for a group of gall wasps that commonly infest oak trees. These wasps lay their eggs in the tissue of the oak leaves, causing abnormal growths or "galls" to form. While there are several species within the genus Andricus, they are often referred to collectively as oak gall wasps. Other synonyms for Genus Andricus include oak apple wasps, apple gall wasps, and oak woolly gall wasps. These insects have a significant impact on the health and growth of oak trees, and they have been studied extensively by entomologists and scientists seeking to understand their behavior and ecology.