Oak apple gall Published June 7, 2015 at 540 × 419 in The Insects Behind the Weird Growths on Plants Oak apple gall. Photo by Jim Conrad. ‹ Return to post Leave a Reply Cancel reply This site uses Akismet to reduce spam. Learn how your comment data is processed. Subscribe to Entomology Today! Enter your email address to subscribe to Entomology Today. You'll receive notifications of new posts by email. Email Address Subscribe Search Search for... Search 2023 Insect Wall CalendarGet Certified!Find ESA on FacebookFollow ESA on Twitter