Pest Alert – Two Horned Oak Gall Wasp

Have you been noticing the leaves of your Coast live oaks and Interior live oaks beginning to turn yellow or become distorted? Recently, there has been an increase in the population of a pest called Two Horned Oak Gall Wasp (THOGW). This pest feeds on the underside of the leaves and causes discoloration, a “burned” appearance, and, in some instances, premature leaf drop. This pest, not to be confused with similar fungal damage, is identified by checking the underside of the leaf to see if swelled growths with two hornlike bumps are present.


If your trees are beginning to show signs of THOGW, please give us a call, and we will be happy to get you scheduled and put on a treatment plan to help begin to suppress this pest.

By |2024-01-03T15:57:26+00:00January 3rd, 2024|Blog, News, Tree Health|