The Extension Master Gardener Hotline takes questions about gardening from 9 a.m. to noon and 1 to 4 p.m. weekdays at 660-0190.
We are beginning to see samples of succulent oak gall on pin oak and Shumard oak trees.
This is caused by a tiny wasp that lays eggs in expanding buds of pin oak early in the spring. These gooseberry-like galls form with a tiny white egg inside. A tiny wasp will hatch out in mid-May, and the gall will then dry up. There is just one generation per year. The trees will put on new growth and grow normally for the rest of the summer. No treatment is necessary. If any treatment is used, it is a spray at bud break (which would have been a couple of weeks ago).