Question: What are the growths that are on my oaks?

Answer:

There are dozens of types of insect galls that are common on Texas oaks. Live oaks have woolly oak galls that look like pea-sized tufts of tan fuzz on the backs of the leaves. They also have woody oak galls that cause marble-sized, dark brown woody balls to form on the small twigs. You’ll see the very large “apple” galls on red oak leaves, and others will show up from time to time. The important thing to remember with galls is that they do no major damage, and there is no way to control them. Move on with your life. Their populations will likely be reduced another year.