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From: Schertz, TX
Region: Southwest
Topic: Trees
Title: Young oak tree with dead branches
Answered by: Nan Hampton
If you do decide to prune, you should consider carefully what time of year you do it. Oak wilt is a serious disease of several species of oaks that occur in or adjacent to Guadalupe County—Quercus buckleyi (Buckley oak), Quercus marilandica (blackjack oak), Quercus fusiformis (plateau live oak), Quercus shumardii (Shumard's oak), and Quercus virginiana (live oak). Other oaks in your area—Quercus macrocarpa (bur oak), Quercus stellata (post oak) and Quercus muehlenbergii (chinkapin oak)—are less susceptible to the fungus that causes oak wilt.
To help prevent oak wilt the Texas Forest Service recommends NOT pruning oak trees from February through June—the period of the year when the beetles that transfer the fungus to the tree are most active. Additionally, no matter what time of year it is, you should paint cuts and wounds with tree wound paint as soon as they are made.
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