{"id":17347,"date":"2020-03-05T16:27:29","date_gmt":"2020-03-05T19:27:29","guid":{"rendered":"https:\/\/www.lawnstarter.com\/blog\/?p=17347"},"modified":"2026-06-11T21:22:37","modified_gmt":"2026-06-12T00:22:37","slug":"how-stop-oak-wilt-common-san-antonio-tree-diseases","status":"publish","type":"post","link":"https:\/\/www.lawnstarter.com\/blog\/texas\/san-antonio-tx\/how-stop-oak-wilt-common-san-antonio-tree-diseases\/","title":{"rendered":"How to Stop Oak Wilt, Other San Antonio Tree Diseases"},"content":{"rendered":"<p class=\"wp-block-paragraph\">San Antonio tree diseases threaten the live oaks and red oaks that define the city&#8217;s landscape. Oak wilt is the most destructive, having killed more than 1 million trees across 76 Texas counties.<\/p>    <p class=\"wp-block-paragraph\">Caused by the fungus <em>Bretziella fagacearum<\/em>, oak wilt spreads through root connections underground and beetle activity above ground. Once a tree is infected, there is no cure. Early identification and swift action are the best defenses.<\/p>    <p class=\"wp-block-paragraph\">Whether you need tree disease treatment or preventive pruning, LawnStarter connects you with vetted <a href=\"https:\/\/www.lawnstarter.com\/san-antonio-tx-tree-care\">San Antonio tree care pros<\/a> who can help protect your San Antonio oaks.<\/p>    <figure class=\"wp-block-table is-style-stripes has-medium-font-size\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Key Takeaways<\/strong><\/th><\/tr><\/thead><tbody><tr><td>\u2022 Oak wilt has no cure, but fungicide injection and trenching can slow or stop its spread to nearby trees.<br>\u2022 Avoid pruning or wounding oak trees from February through June, when disease-carrying beetles are most active.<br>\u2022 Other San Antonio tree diseases like hypoxylon cankers, root rot, and bacterial leaf scorch have different symptoms and treatments.<\/td><\/tr><\/tbody><\/table><\/figure>   <div class=\"wp-block-ub-table-of-contents-block ub_table-of-contents\" id=\"ub_table-of-contents-68d3b356-0b85-4ff2-bfb6-92020a74f2e8\" data-linktodivider=\"false\" data-showtext=\"show\" data-hidetext=\"hide\" data-scrolltype=\"auto\" data-enablesmoothscroll=\"false\" data-initiallyhideonmobile=\"false\" data-initiallyshow=\"true\"><div class=\"ub_table-of-contents-header-container\" style=\"\"> \t\t\t<div class=\"ub_table-of-contents-header\" style=\"text-align: left; \"> \t\t\t\t<div class=\"ub_table-of-contents-title\" style=\"\"><\/div> \t\t\t\t \t\t\t<\/div> \t\t<\/div><div class=\"ub_table-of-contents-extra-container\" style=\"\"> \t\t\t<div class=\"ub_table-of-contents-container ub_table-of-contents-1-column\"> \t\t\t\t<ul style=\"\"><li style=\"\"><a href=\"https:\/\/www.lawnstarter.com\/blog\/texas\/san-antonio-tx\/how-stop-oak-wilt-common-san-antonio-tree-diseases\/#0-how-to-identify-oak-wilt\" style=\"\">How to Identify Oak Wilt<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.lawnstarter.com\/blog\/texas\/san-antonio-tx\/how-stop-oak-wilt-common-san-antonio-tree-diseases\/#1-how-oak-wilt-spreads\" style=\"\">How Oak Wilt Spreads<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.lawnstarter.com\/blog\/texas\/san-antonio-tx\/how-stop-oak-wilt-common-san-antonio-tree-diseases\/#2-how-to-prevent-oak-wilt\" style=\"\">How to Prevent Oak Wilt<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.lawnstarter.com\/blog\/texas\/san-antonio-tx\/how-stop-oak-wilt-common-san-antonio-tree-diseases\/#3-oak-wilt-treatment-options\" style=\"\">Oak Wilt Treatment Options<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.lawnstarter.com\/blog\/texas\/san-antonio-tx\/how-stop-oak-wilt-common-san-antonio-tree-diseases\/#7-how-much-does-oak-wilt-treatment-cost\" style=\"\">How Much Does Oak Wilt Treatment Cost?<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.lawnstarter.com\/blog\/texas\/san-antonio-tx\/how-stop-oak-wilt-common-san-antonio-tree-diseases\/#8-other-common-san-antonio-tree-diseases\" style=\"\">Other Common San Antonio Tree Diseases<\/a><\/li><\/ul> \t\t\t<\/div> \t\t<\/div><\/div>   <h2 id=\"0-how-to-identify-oak-wilt\" class=\"wp-block-heading\">How to Identify Oak Wilt<\/h2>    <p class=\"wp-block-paragraph\">Oak wilt is a vascular disease that blocks water flow inside the tree, causing leaves to wilt and drop. Symptoms vary by species, so knowing which type of oak you have helps you spot the warning signs early.<\/p>    <p class=\"wp-block-paragraph\"><strong>Live oaks:<\/strong> The hallmark symptom is veinal necrosis, a pattern where the leaf veins themselves turn yellow or brown while the tissue between veins stays green. Leaves may curl and drop over several months.<\/p>    <p class=\"wp-block-paragraph\"><strong>Red oaks:<\/strong> These trees are the most vulnerable. Leaves wilt rapidly from the top of the canopy down, turning dull green or bronze. A mature red oak can die within one month of showing symptoms.<\/p>    <p class=\"wp-block-paragraph\"><strong>White oaks:<\/strong> This group is the least susceptible. Symptoms appear slowly and may affect only individual branches. White oaks rarely die from oak wilt alone.<\/p>    <p class=\"wp-block-paragraph\">If you suspect oak wilt, send leaf samples to the <a href=\"https:\/\/plantclinic.tamu.edu\/\" target=\"_blank\" rel=\"noreferrer noopener\">Texas Plant Disease Diagnostic Lab<\/a> at Texas A&amp;M for confirmation. Early lab testing gives you the best chance of protecting nearby trees.<\/p>    <h2 id=\"1-how-oak-wilt-spreads\" class=\"wp-block-heading\">How Oak Wilt Spreads<\/h2>    <p class=\"wp-block-paragraph\">Oak wilt spreads in two ways: above ground through insects and below ground through connected root systems. Understanding both pathways is critical to stopping the disease before it reaches healthy trees.<\/p>    <p class=\"wp-block-paragraph\"><strong>Above ground (beetles):<\/strong> Small sap-feeding nitidulid beetles carry oak wilt spores from infected red oaks to fresh wounds on healthy trees. These tiny insects are attracted to the sweet-smelling fungal mats that form under the bark of dead red oaks.<\/p>    <p class=\"wp-block-paragraph\">These beetles are most active from February through June, which is why pruning during that window is so risky.<\/p>    <p class=\"wp-block-paragraph\"><strong>Below ground (root grafts):<\/strong> This is the primary way oak wilt spreads in San Antonio. Live oaks growing near each other often share fused root systems. The fungus travels through these root connections at an average rate of 75 feet per year.<\/p>    <p class=\"wp-block-paragraph\">Root graft transmission is especially dangerous because it happens silently underground. By the time you notice symptoms in one tree, the fungus may have already reached neighboring oaks.<\/p>    <h2 id=\"2-how-to-prevent-oak-wilt\" class=\"wp-block-heading\">How to Prevent Oak Wilt<\/h2>    <figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" src=\"https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2020\/03\/tree-pruning-apple-and-pear-australia-ltd-cc20.jpg\" alt=\"Person pruning branches on a fruit tree.\"\/><figcaption class=\"wp-element-caption\">Tree pruning. Photo Credit: <a href=\"https:\/\/www.flickr.com\/photos\/applesnpearsau\/34286288544\" target=\"_blank\" rel=\"noopener noreferrer\">Apple and Pear Australia, Ltd<\/a> \/ Flickr \/ <a href=\"https:\/\/creativecommons.org\/licenses\/by\/2.0\/\" target=\"_blank\" rel=\"noopener noreferrer\">CC BY 2.0<\/a><\/figcaption><\/figure>    <p class=\"wp-block-paragraph\">Prevention is far easier and cheaper than treatment. These steps significantly reduce the risk of oak wilt reaching your San Antonio trees.<\/p>    <p class=\"wp-block-paragraph\"><strong>Time your pruning carefully:<\/strong> Never prune oaks between February 1 and the end of June. This is when nitidulid beetles are actively flying and seeking fresh wounds.<\/p>    <p class=\"wp-block-paragraph\"><strong>Paint all wounds immediately:<\/strong> If a branch breaks or pruning is unavoidable, seal the wound with latex paint or pruning sealer right away. This applies year-round, not just during beetle season. A can of pruning sealer costs under $10 at most hardware stores.<\/p>    <p class=\"wp-block-paragraph\"><strong>Use proper pruning techniques:<\/strong> Make clean cuts just outside the branch collar. Avoid tearing bark or leaving stubs, which create larger wound surfaces that attract beetles.<\/p>    <p class=\"wp-block-paragraph\"><strong>Diversify your tree species:<\/strong> Planting non-oak species between your oaks reduces the chance of root graft transmission. Consider <a href=\"https:\/\/www.lawnstarter.com\/blog\/texas\/san-antonio-tx\/best-native-trees-san-antonio\/\">San Antonio native trees<\/a> like cedar elm, Texas mountain laurel, or Mexican buckeye.<\/p>    <figure class=\"wp-block-image alignright size-full\"><img decoding=\"async\" src=\"https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2020\/03\/david-appel.png\" alt=\"Dr. David Appel\"\/><figcaption class=\"wp-element-caption\">Dr. David Appel. Photo Credit: Texas A&amp;M University \/ Department of Plant Pathology.<\/figcaption><\/figure>    <p class=\"wp-block-paragraph\">&#8220;Don&#8217;t allow the trees to be wounded during the spring,&#8221; says David Appel, plant pathologist and professor emeritus at Texas A&amp;M in College Station. Appel warns that February through June is when beetles spread the fungus from diseased red oaks to fresh wounds on healthy trees.<\/p>    <h2 id=\"3-oak-wilt-treatment-options\" class=\"wp-block-heading\">Oak Wilt Treatment Options<\/h2>    <p class=\"wp-block-paragraph\">There is no cure for oak wilt, but two main methods can slow or stop the disease from spreading. The right approach depends on whether you are protecting healthy trees or managing an active infection.<\/p>    <h3 id=\"4-fungicide-injection-for-oak-wilt\" class=\"wp-block-heading\">Fungicide Injection for Oak Wilt<\/h3>    <p class=\"wp-block-paragraph\">Propiconazole is the fungicide most commonly injected into oaks to fight oak wilt. It is delivered directly into the tree&#8217;s vascular system through small holes drilled at the base of the trunk.<\/p>    <p class=\"wp-block-paragraph\">Fungicide injection works best as a preventive measure. Treating healthy trees near an active infection zone can extend their life and stop above-ground spread.<\/p>    <p class=\"wp-block-paragraph\">Injections typically need to be repeated every one to two years. Trees that are already heavily symptomatic rarely recover, even with treatment.<\/p>    <figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" src=\"https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2020\/03\/800px-Oak_Wilt_Treatments_on_LBJ_Ranch.jpg\" alt=\"Two arborists perform oak wilt treatment around large tree trunks using injection equipment in a grassy park setting.\"\/><figcaption class=\"wp-element-caption\">Oak wilt treatment. Photo Credit: <a href=\"https:\/\/commons.wikimedia.org\/wiki\/File:Oak_Wilt_Treatments_on_LBJ_Ranch_(64b4e948-e3f2-444c-ac62-01ae8dcf151f).jpg\" target=\"_blank\">NPS<\/a> \/ Wikimedia Commons \/ <a href=\"https:\/\/en.wikipedia.org\/wiki\/Public_domain\" target=\"_blank\" rel=\"noreferrer noopener\">Public Domain<\/a><\/figcaption><\/figure>    <h3 id=\"5-trenching-for-oak-wilt\" class=\"wp-block-heading\">Trenching for Oak Wilt<\/h3>    <p class=\"wp-block-paragraph\">Trenching severs the underground root connections that allow oak wilt to spread from tree to tree. A trench must be at least 4 feet deep to cut below the root graft zone.<\/p>    <p class=\"wp-block-paragraph\">Crews typically use a trenching machine, rock saw, or ripper bars to cut through the soil and rock. In San Antonio&#8217;s limestone-heavy ground, specialized rock-cutting equipment is often necessary.<\/p>    <p class=\"wp-block-paragraph\">Trenches should be placed at least 100 feet beyond the last symptomatic tree. This stays ahead of the fungus moving through tree root grafts.<\/p>    <h3 id=\"6-air-excavation-for-oak-wilt\" class=\"wp-block-heading\">Air Excavation for Oak Wilt<\/h3>    <p class=\"wp-block-paragraph\">Arborists sometimes use air excavation as a diagnostic technique. Pressurized air is directed at the base of a tree to expose roots without damaging them. This allows <a href=\"https:\/\/www.lawnstarter.com\/san-antonio-tx-tree-care\">trained arborists<\/a> to inspect root grafts and plan trenching routes more accurately.<\/p>    <h2 id=\"7-how-much-does-oak-wilt-treatment-cost\" class=\"wp-block-heading\">How Much Does Oak Wilt Treatment Cost?<\/h2>    <p class=\"wp-block-paragraph\">Oak wilt treatment costs depend on the method, tree size, and severity of infection. Here is a general breakdown for San Antonio homeowners:<\/p>    <figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Treatment<\/strong><\/td><td><strong>Typical Cost<\/strong><\/td><td><strong>Frequency<\/strong><\/td><\/tr><tr><td>Fungicide injection<\/td><td>$150 to $500 per tree<\/td><td>Every 1 to 2 years<\/td><\/tr><tr><td>Trenching<\/td><td>$500 to $2,000+ per line<\/td><td>One-time<\/td><\/tr><tr><td>Tree removal<\/td><td>$400 to $1,500 per tree<\/td><td>One-time<\/td><\/tr><\/tbody><\/table><\/figure>    <p class=\"wp-block-paragraph\">Trenching costs vary widely based on soil conditions, trench length, and equipment required. San Antonio&#8217;s rocky terrain often demands specialized rock-cutting equipment, which increases the price.<\/p>    <p class=\"wp-block-paragraph\">Tree removal may also include stump grinding as an additional cost. Be sure to ask your arborist about stump removal when getting a quote.<\/p>    <p class=\"wp-block-paragraph\">The <a href=\"https:\/\/tfsweb.tamu.edu\/\" target=\"_blank\" rel=\"noreferrer noopener\">Texas A&amp;M Forest Service<\/a> runs the Oak Wilt Suppression Project, a cost-share program that helps Texas property owners offset treatment expenses. Contact your local forester to see if your neighborhood qualifies.<\/p>    <p class=\"wp-block-paragraph\">San Antonio also has a <a target=\"_blank\" href=\"https:\/\/www.sa.gov\/Directory\/Departments\/DSD\/Constructing\/Preservation-Conservation\/Tree-Preservation\/Oak-Wilt\">city ordinance<\/a> that regulates tree removal and pruning of oaks. Check local requirements before starting any oak wilt treatment or tree removal work.<\/p>    <p class=\"wp-block-paragraph\"><strong>See Related:<\/strong> <a href=\"https:\/\/www.lawnstarter.com\/blog\/tree-care\/5-ways-remove-tree-stump\/\">How to Remove a Tree Stump (5 Ways)<\/a><\/p>    <h2 id=\"8-other-common-san-antonio-tree-diseases\" class=\"wp-block-heading\">Other Common San Antonio Tree Diseases<\/h2>    <p class=\"wp-block-paragraph\">Oak wilt gets the most attention, but San Antonio trees face several other diseases. Here are 3 more conditions to watch for on your property.<\/p>    <h3 id=\"9-hypoxylon-cankers-on-san-antonio-trees\" class=\"wp-block-heading\">Hypoxylon Cankers on San Antonio Trees<\/h3>    <figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" src=\"https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2020\/03\/hypoloxon-canker-katja-schulz-cc20.jpg\" alt=\"Close-up of dark fungal growth on tree bark, a possible sign related to oak wilt or tree disease.\"\/><figcaption class=\"wp-element-caption\">Hypoxylon canker. Photo Credit: <a href=\"https:\/\/www.flickr.com\/photos\/treegrow\/36332975246\" target=\"_blank\" rel=\"noopener noreferrer\">Katja Schulz<\/a> \/ Flickr \/ <a href=\"https:\/\/creativecommons.org\/licenses\/by\/2.0\/\" target=\"_blank\" rel=\"noopener noreferrer\">CC BY 2.0<\/a><\/figcaption><\/figure>    <p class=\"wp-block-paragraph\">Hypoxylon cankers appear as dark, dead lesions on the bark of stressed trees. The fungus causes white-rot decay inside the wood, weakening the tree&#8217;s structure over time.<\/p>    <p class=\"wp-block-paragraph\">Trees suffering from drought stress, root damage, or construction injury are most vulnerable. Hypoxylon rarely attacks healthy, well-watered trees.<\/p>    <p class=\"wp-block-paragraph\">Once cankers are visible, the internal decay is usually advanced. Severely affected trees may need removal to prevent hazardous limb failure.<\/p>    <h3 id=\"10-root-rot-in-san-antonio-trees\" class=\"wp-block-heading\">Root Rot in San Antonio Trees<\/h3>    <p class=\"wp-block-paragraph\">Root rot develops when soil stays soggy for extended periods, starving roots of oxygen. Fungal organisms then invade the weakened root tissue and cause decay below the soil line.<\/p>    <p class=\"wp-block-paragraph\">Symptoms include yellowing leaves, thinning canopy, and poor growth despite adequate watering. Affected trees may lean or show mushroom growth at the base.<\/p>    <p class=\"wp-block-paragraph\">Improving drainage around the tree is the most effective fix. Avoid overwatering and ensure mulch is not piled against the trunk.<\/p>    <h3 id=\"11-bacterial-leaf-scorch-on-san-antonio-trees\" class=\"wp-block-heading\">Bacterial Leaf Scorch on San Antonio Trees<\/h3>    <p class=\"wp-block-paragraph\">Bacterial leaf scorch is often mistaken for oak wilt because both cause browning leaf margins. The key difference is that bacterial leaf scorch progresses slowly, and affected trees can survive for years with declining health.<\/p>    <p class=\"wp-block-paragraph\">The disease is spread by leafhoppers and spittlebugs that carry the bacterium from tree to tree. It affects oaks, elms, sycamores, mulberry, and maples.<\/p>    <p class=\"wp-block-paragraph\">There is no cure, but antibiotic injections can suppress symptoms temporarily. If you are unsure whether your tree has oak wilt or bacterial leaf scorch, send samples to the diagnostic lab for testing.<\/p>    <h2 id=\"12-hire-a-tree-care-professional-to-protect-your-san-antonio-trees\" class=\"wp-block-heading\">Hire a Tree Care Professional to Protect Your San Antonio Trees<\/h2>    <p class=\"wp-block-paragraph\">San Antonio&#8217;s trees face real threats from oak wilt and other diseases, but early detection and proper care make a big difference. If you spot warning signs or need preventive treatment, LawnStarter&#8217;s <a href=\"https:\/\/www.lawnstarter.com\/san-antonio-tx-tree-care\">San Antonio tree care pros<\/a> can connect you with experienced local arborists. Get a free quote today.<\/p>    <p class=\"wp-block-paragraph\">We also have tree care pros in <a href=\"https:\/\/www.lawnstarter.com\/helotes-tx-tree-care\">Helotes<\/a>, <a href=\"https:\/\/www.lawnstarter.com\/schertz-tx-tree-care\">Schertz<\/a>, <a href=\"https:\/\/www.lawnstarter.com\/floresville-tx-tree-care\">Floresville<\/a>, <a href=\"https:\/\/www.lawnstarter.com\/boerne-tx-tree-care\">Boerne<\/a>, and <a href=\"https:\/\/www.lawnstarter.com\/new-braunfels-tx-tree-care\">New Braunfels<\/a>.<\/p>    <div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1781215121964\"><strong class=\"schema-faq-question\"><\/strong> <p class=\"schema-faq-answer\"><\/p> <\/div> <\/div>    <p class=\"wp-block-paragraph\">Main Image: Dropped leaves in midsummer signal oak tree wilt. Image Credit: <a href=\"https:\/\/commons.wikimedia.org\/wiki\/File:Oak_Wilt_Dropped_Leaves_Polk_County_WI_Noon_July_14,_2016.png\" target=\"_blank\" rel=\"noreferrer noopener\">Wood Geek<\/a> \/ Wikimedia Commons \/ <a href=\"https:\/\/creativecommons.org\/licenses\/by-sa\/4.0\/deed.en\" target=\"_blank\" rel=\"noreferrer noopener\">CC BY-SA 4.0<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Oak wilt in San Antonio has no cure and kills oaks in months. Learn how to identify symptoms, prevent the spread, and weigh treatment options.<\/p>\n","protected":false},"author":60,"featured_media":17348,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[218],"tags":[220,172,1286],"class_list":["post-17347","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-san-antonio-tx","tag-san-antonio","tag-texas","tag-tree-care"],"acf":[],"featured_image_src":"https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2020\/03\/rsz_oak_wilt_dropped_leaves_polk_county_wi_noon_july_14_2016.jpg?wsr","author_info":{"display_name":"Jennifer Lester","author_link":"https:\/\/www.lawnstarter.com\/blog\/author\/jennifer-lester\/"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Stop Oak Wilt, Other San Antonio Tree Diseases<\/title>\n<meta name=\"description\" content=\"Oak wilt in San Antonio has no cure and kills oaks in months. 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