If this happens to you, use a tree wound sealer available.
Generally, the worst time to prune trees in Texas is between February to June. However, this range greatly depends on your climate and the temperature.
Best Time for Pruning To avoid the problems of oozing sap and attracting pests such as beetles, it is best to trim your oak tree in the middle of winter, when bugs are dormant or shrubfall.clubon: Lavaca St SuiteAustin,Texas. Jan 02, When is the best time to prune oak trees?

In most cases, the best time to prune oak trees is November 1 to March That’s because sap beetles, insects that spread oak wilt, are active from April to August. These beetles sniff out the sweet smell of the oak wilt fungus on infected trees, feed on the fungus and then spread it to healthy oak trees that have fresh pruning cuts. Clean all pruning tools with 10% bleach solution or Lysol between sites and/or trees.
If possible avoid pruning or wounding of oaks during the spring (currently defined as February1 through June 30).
Reasons to prune in the spring include: To accommodate public safety concerns such as hazardous limbs, traffic visibilityFile Size: 60KB. City of Abilene – Recommended Trees & Shrubs Revised: March 28, RECOMMENDED TREES DECIDUOUS +Bald Cypress Barberry Bradford Pear Dwarf Butterfly Bush +Shumard Oak Texas Sage +Texas Red Oak Wax Myrtle +Texas Redbud Texas Sophora Texas Walnut EVERGREEN Afghan Pine Austrian Pine +Eastern Red Cedar.