SA Code Enforcement Section, Development Services Department
Code Enforcement Section,
Development Services Department
Message from the Director
Oak Wilt is a deadly fungal disease that infects
and disables the water-conducting system in oak trees. All Oaks
are susceptible to this disease, but some species more than
others. With no known cure, methods to control are
expensive and treatments are not always effective or
Oak Wilt is prevalent in Central Texas and spreads
both above and below ground. Fungal mats develop under the bark
on the trunks and major branches of infected Red oak trees. When
the fungal mat enlarges and cracks the bark of the tree, an odor
is released that attracts sap-feeding beetles. The fungus is
transmitted when these beetles feed on the fungal mats and carry
fungal spores to fresh wounds or cuts on healthy oak trees.
Because oak trees have interconnected roots, the disease can be
spread below ground through grafted root systems, eventually
killing great numbers of oak trees in the area.
Trees are an important public resource that
enhance the quality of life, add value to properties and reduce
energy costs and pollutants. Our City Arborist has some tips you
can follow to help prevent Oak Wilt in your neighborhood:
Minimize pruning oak trees between
February 1 and July 1. This is when the Oak Wilt fungus is
Best time to prune trees is either in the
middle of the summer, when temperatures are the hottest, or
in late fall/early winter months when temperatures can be
Paint all cuts and wounds on oak trees
within 30 minutes.
Remove Red Oaks identified with Oak Wilt.
Know where your firewood comes from.
Don't transport unseasoned firewood from diseased Red Oaks.
Make sure contractors doing tree pruning
have a valid, city issued tree maintenance license and
If you suspect Oak Wilt in
your neighborhood, contact the Texas Forest Service at (210)