{"id":101844,"date":"2026-04-24T18:14:08","date_gmt":"2026-04-24T21:14:08","guid":{"rendered":"https:\/\/www.lawnstarter.com\/blog\/?p=101844"},"modified":"2026-04-27T15:14:40","modified_gmt":"2026-04-27T18:14:40","slug":"pythium-blight","status":"publish","type":"post","link":"https:\/\/www.lawnstarter.com\/blog\/lawn-care-2\/pythium-blight\/","title":{"rendered":"Pythium Blight Lawn Disease: How to Identify, Control, and Prevent"},"content":{"rendered":"<p class=\"wp-block-paragraph\">If your lawn has small, recessed patches of grass that look water-soaked, you may have Pythium blight \u2014 and you need to act today, not tomorrow.<\/p>    <p class=\"wp-block-paragraph\">This aggressive lawn disease can kill entire sections of grass within 24 to 48 hours in hot, humid weather. Every hour of delay increases both the spread and the cost of recovery.<\/p>    <p class=\"wp-block-paragraph\">Cloudy, humid, warm weather promotes Pythium blight. Once grass is infected, extreme heat and humidity exacerbate the disease and lead to dead grass. Here&#8217;s how to identify, eliminate, and prevent this devastating lawn problem.<\/p>    <p class=\"wp-block-paragraph\">Treating Pythium blight requires the right fungicides applied at the right time. <a href=\"https:\/\/signup-web.lawnstarter.com\/cart\/contact-info?intent=fertilization\">LawnStarter&#8217;s lawn treatment pros<\/a> can diagnose and treat your lawn quickly, stopping the spread before it destroys your yard.<\/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 Pythium blight appears as water-soaked, greasy patches that can kill grass in days without immediate fungicide treatment.<br>\u2022 Cool-season grasses like perennial ryegrass are most susceptible, while improved Bermudagrass cultivars offer the best resistance.<br>\u2022 Prevention through proper watering, fertilization, and drainage is more effective than treatment after infection occurs.<\/td><\/tr><\/tbody><\/table><\/figure>   <div class=\"wp-block-ub-table-of-contents-block ub_table-of-contents\" id=\"ub_table-of-contents-e27f6cb3-ffe9-449e-9270-b3d3f83385dd\" 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=\"\">Table of Contents<\/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\/lawn-care-2\/pythium-blight\/#0-what-is-pythium-blight\" style=\"\">What Is Pythium Blight?<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.lawnstarter.com\/blog\/lawn-care-2\/pythium-blight\/#2-how-to-treat-pythium-blight-and-stop-it-from-spreading\" style=\"\">How to Treat Pythium Blight (and Stop It From Spreading)<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.lawnstarter.com\/blog\/lawn-care-2\/pythium-blight\/#3-how-to-keep-pythium-blight-from-coming-back\" style=\"\">How to Keep Pythium Blight From Coming Back<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.lawnstarter.com\/blog\/lawn-care-2\/pythium-blight\/#4-why-did-pythium-blight-hit-my-lawn\" style=\"\">Why Did Pythium Blight Hit My Lawn?<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.lawnstarter.com\/blog\/lawn-care-2\/pythium-blight\/#5-when-to-stop-diy-and-call-a-lawn-pro-for-pythium-blight\" style=\"\">When to Stop DIY and Call a Lawn Pro for Pythium Blight<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.lawnstarter.com\/blog\/lawn-care-2\/pythium-blight\/#6-faqs\" style=\"\">FAQs<\/a><\/li><\/ul> \t\t\t<\/div> \t\t<\/div><\/div>   <h2 class=\"wp-block-heading\" id=\"0-what-is-pythium-blight\">What Is Pythium Blight?<\/h2>    <p class=\"wp-block-paragraph\">Pythium blight is an aggresive lawn disease that appears as water-soaked, greasy patches on grass. According to New Mexico State University, it can spread and kill your entire lawn <a href=\"https:\/\/plantclinic.nmsu.edu\/documents\/pythium-_td-8__final.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">within 24 to 48 hours<\/a> during hot, humid weather.<\/p>    <p class=\"wp-block-paragraph\">It&#8217;s caused by <em>Pythium<\/em>&nbsp;species, parasitic organisms that behave like fungal lawn diseases but belong to a separate group called oomycetes or &#8220;water molds&#8221; \u2014 which is why standard broad-spectrum fungicides often fail against them.  Always look for products specifically labeled for <em>Pythium<\/em> control. <\/p>    <p class=\"wp-block-paragraph\"><strong>Symptoms of Pythium blight in your lawn include:<\/strong><\/p>    <ul class=\"wp-block-list\"> <li><p>Small, sunken circles on the grass with dark green, black, or purple spots<\/p><\/li>    <li><p>Grass blades that appear drenched or waterlogged<\/p><\/li>    <li><p>Grass that feels oily when you touch it (wash your hands after contact)<\/p><\/li>    <li><p>Grass blades covered with a cottony white or gray material, especially in the morning when the grass is wet from the preceding night&#8217;s rainfall<\/p><\/li>    <li><p>Patches of yellowing or dead, brown grass<\/p><\/li> <\/ul>    <p class=\"wp-block-paragraph\">The first symptom you&#8217;re likely to notice is patches of grass that look water-soaked or greasy. These patches mark the beginning stages of the disease and spread quickly. Treat your lawn immediately if it is showing signs of infection.<\/p>    <p class=\"wp-block-paragraph\">Your grass type determines your lawn&#8217;s susceptibility to Pythium blight. <a href=\"https:\/\/www.lawnstarter.com\/blog\/lawn-care-2\/cool-season-grass-growing-guide\/\">Cool-season grasses<\/a>&nbsp;are more vulnerable, while <a href=\"https:\/\/www.lawnstarter.com\/blog\/lawn-care-2\/warm-season-grass-growing-guide\/\">warm-season grasses<\/a> are more resistant but can still be infected.<\/p>    <h3 class=\"wp-block-heading\" id=\"1-which-grass-types-are-most-at-risk-for-pythium-blight\">Which Grass Types Are Most at Risk for Pythium Blight?<\/h3>    <p class=\"wp-block-paragraph\"><strong>Perennial ryegrass<\/strong> and <strong>annual bluegrass<\/strong> are the most susceptible grass type of all. According to North Carolina State Extension, they can sustain significant damage in as little as <a target=\"_blank\" href=\"https:\/\/content.ces.ncsu.edu\/pythium-blight-in-turf\">2 to 3 days<\/a> under favorable conditions. <\/p>    <figure class=\"wp-block-image aligncenter size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2023\/05\/LS-cool-season-growth.jpg?wsr\" alt=\"A picture showing growth of cool season grass round the year\" class=\"wp-image-92131\" srcset=\"https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2023\/05\/LS-cool-season-growth.jpg 800w, https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2023\/05\/LS-cool-season-growth-300x169.jpg 300w, https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2023\/05\/LS-cool-season-growth-646x363.jpg 646w, https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2023\/05\/LS-cool-season-growth-150x84.jpg 150w, https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2023\/05\/LS-cool-season-growth-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption class=\"wp-element-caption\">Infographic by Juan Rodriguez <br><\/figcaption><\/figure>    <p class=\"wp-block-paragraph\">Among cool-season options, <strong>Kentucky bluegrass<\/strong> and <strong>tall fescue<\/strong> are more resistant but can still be severely affected during prolonged hot, humid spells.<\/p>    <figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2023\/05\/LS-warm-season-growth-1.jpg?wsr\" alt=\"A picture showing growth of warm season grass round the year\" class=\"wp-image-92138\" srcset=\"https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2023\/05\/LS-warm-season-growth-1.jpg 800w, https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2023\/05\/LS-warm-season-growth-1-300x169.jpg 300w, https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2023\/05\/LS-warm-season-growth-1-646x363.jpg 646w, https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2023\/05\/LS-warm-season-growth-1-150x84.jpg 150w, https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2023\/05\/LS-warm-season-growth-1-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption class=\"wp-element-caption\">Infographic by Juan Rodriguez<\/figcaption><\/figure>    <p class=\"wp-block-paragraph\">Among warm-season grasses, bermudagrass \u2014 particularly improved cultivars \u2014 tends to experience less severe Pythium blight damage, though it is not immune. Note that ultradwarf bermudagrass varieties are an exception and can be quite vulnerable.<\/p>    <p class=\"wp-block-paragraph\">If your lawn is primarily perennial ryegrass and you live in a hot, humid climate, your risk of a summer outbreak is significantly higher.&nbsp;Consider overseeding with a more resistant variety as a long-term prevention strategy.<\/p>    <figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Grass Type<\/strong><\/td><td><strong>Pythium Blight Symptoms<\/strong><\/td><td><strong>Patch Characteristics<\/strong><\/td><\/tr><tr><td>Cool-season (perennial ryegrass, Kentucky bluegrass)<\/td><td>Small, recessed, circular patches with a patch size of 2 to 6 inches that can merge into larger blighted areas<\/td><td>Develop in hot, humid weather<\/td><\/tr><tr><td>Warm-season (Zoysiagrass, Bermudagrass)<\/td><td>Small black or purple spots that grow into large, irregular patches<\/td><td>Appear in humid, overcast, warm weather<\/td><\/tr><\/tbody><\/table><\/figure>    <p class=\"wp-block-paragraph\">A cottony substance&nbsp;called mycelium on grass blades signals an advanced Pythium blight infection. Once mycelium appears, grass withers and turns yellow then brown \u2014 indicating the grass is already dead.<\/p>    <h2 class=\"wp-block-heading\" id=\"2-how-to-treat-pythium-blight-and-stop-it-from-spreading\">How to Treat Pythium Blight (and Stop It From Spreading)<\/h2>    <p class=\"wp-block-paragraph\">Act fast \u2014 Pythium blight can kill your grass within 24 to 48 hours under hot, humid conditions. The right fungicide, applied immediately, is your best weapon.<\/p>    <p class=\"wp-block-paragraph\">Start by sending samples of affected grass to your local <a target=\"_blank\" href=\"https:\/\/www.uaex.uada.edu\/about-extension\/united-states-extension-offices.aspx\">Extension office<\/a> to confirm a Pythium blight diagnosis, then apply a targeted treatment without delay.<\/p>    <p class=\"wp-block-paragraph\">This is especially important because Pythium blight symptoms closely mimic other diseases like dollar spot and brown patch \u2014 and the fungicide that kills one won&#8217;t work on the other.<\/p>    <p class=\"wp-block-paragraph\">If the grass tests positive, you can kill the pathogens with fungicides, even though they aren&#8217;t fungi.<\/p>    <p class=\"wp-block-paragraph\"><strong>Act immediately:<\/strong> Systemic fungicides are most effective when applied within the first <a target=\"_blank\" href=\"https:\/\/extension.okstate.edu\/fact-sheets\/fungicide-resistance-management\">24 to 72 hours of infection<\/a>, according to Oklahoma State University. <\/p>    <p class=\"wp-block-paragraph\"><strong>Look for products with the following active ingredients to control Pythium blight:<\/strong><\/p>    <ul class=\"wp-block-list\"> <li><p>Mefenoxam\u00a0(e.g., Stergo MX Mefenoxam Fungicide (1 Quart) by Atticus)<\/p><\/li>    <li><p>Propamocarb\u00a0(e.g., Advanced Turf Solutions Proplant Fungicide)<\/p><\/li>    <li><p>Metalaxyl\u00a0(e.g., Regulate Select, 1 Gallon Metalaxyl)<\/p><\/li> <\/ul>    <p class=\"wp-block-paragraph\">Alternate fungicides with different active ingredients to prevent&nbsp;<em>Pythium spp.<\/em> from building resistance. This is called fungicide resistance management, and it&#8217;s especially important for <em>Pythium<\/em>, which has shown <a target=\"_blank\" href=\"https:\/\/extension.umd.edu\/resource\/turfgrass-diseases-pythium-blight-fs-2024-0707\">documented resistance<\/a> to mefenoxam in several parts of the U.S.<\/p>    <p class=\"wp-block-paragraph\">Apply preventive treatments before infection occurs for best&nbsp;results:<\/p>    <ul class=\"wp-block-list\"> <li><p>Apply in spring or summer when night temperatures consistently exceed 65 degrees for cool-season turf (50 degrees for warm-season turf)<\/p><\/li>    <li><p>For a lawn with a history of outbreaks, follow the label and use a shorter spray interval of 10 to 14 days when disease pressure is heavy.<\/p><\/li> <\/ul>    <p class=\"wp-block-paragraph\"><strong>See Related:<\/strong><\/p>    <ul class=\"wp-block-list\"> <li><p><a href=\"https:\/\/www.lawnstarter.com\/blog\/lawn-care-2\/lawn-fungus-treatments\/\">Lawn Fungus Treatments: Costs, Types, and Do They Work?<\/a><\/p><\/li> <\/ul>    <h2 class=\"wp-block-heading\" id=\"3-how-to-keep-pythium-blight-from-coming-back\">How to Keep Pythium Blight From Coming Back<\/h2>    <figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"800\" height=\"533\" src=\"https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2025\/05\/fertilizing-lawn.jpeg\" alt=\"A person wearing yellow rubber gloves holds and sprinkles white granular fertilizer from a green plastic bucket over a grassy lawn.\" class=\"wp-image-134211\" srcset=\"https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2025\/05\/fertilizing-lawn.jpeg 800w, https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2025\/05\/fertilizing-lawn-300x200.jpeg 300w, https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2025\/05\/fertilizing-lawn-656x437.jpeg 656w, https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2025\/05\/fertilizing-lawn-150x100.jpeg 150w, https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2025\/05\/fertilizing-lawn-768x512.jpeg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption class=\"wp-element-caption\">Lawn fertilizer. Photo Credit: <a href=\"https:\/\/stock.adobe.com\/images\/fertilizing-plants-lawns-trees-and-flowers-gardener-in-gloves-holds-white-fertilizer-balls-on-grass\/219158530\" target=\"_blank\" rel=\"noreferrer noopener\">adragan<\/a> \/ Adobe Stock<\/figcaption><\/figure>    <p class=\"wp-block-paragraph\">The best time to fight Pythium blight is before it starts. These cultural practices give your lawn the best defense \u2014 because once the disease takes hold, treatment is expensive and some damage is permanent:<\/p>    <ul class=\"wp-block-list\"> <li><p><strong>Fertilize the lawn properly:<\/strong> Use the correct amount of fertilizer at the right intervals, especially in the summer. It&#8217;s easy to <a href=\"https:\/\/www.lawnstarter.com\/blog\/lawn-care-2\/can-you-over-fertilize-lawn\/\">over-fertilize your lawn<\/a> with nitrogen, which Pythium blight thrives on, so use slow-releasing options if applying nitrogen-based fertilizers.<\/p><\/li>    <li><p><strong>Follow a proper watering schedule:<\/strong> Water your grass in early morning so grass blades dry completely. Watering late at night causes lingering wetness that promotes Pythium blight. Water only when grass shows drought stress like curling blades or fading color.<\/p><\/li>    <li><p><strong>Plant <\/strong>grass seed less vulnerable to Pythium blight<strong>:<\/strong> Kentucky bluegrass and tall fescue are more resistant cool-season options. For warm-season grass, use Bermudagrass&nbsp;\u2014 especially improved cultivars.<\/p><\/li>    <li><p><strong>Improve <\/strong>airflow and reduce shade<strong>:<\/strong> Increase sunlight exposure and improve air circulation by pruning trees and shrubs&nbsp;near your lawn.<\/p><\/li>    <li><p><strong>Repair <\/strong>drainage problems<strong>:<\/strong>&nbsp;Overly moist soil promotes Pythium blight outbreaks. Improving soil drainage in low and poorly drained areas reduces the risk of infection.<\/p><\/li>    <li><p><strong>Mow <\/strong>grass to correct lengths and in the right conditions<strong>:<\/strong>&nbsp;Cut grass to the proper height for your grass type. Mow only when grass is dry, as mowing wet grass promotes disease. Clean mower blades after cutting infected areas to prevent spread. <\/p><\/li> <\/ul>    <p class=\"wp-block-paragraph\"><br>Mow the lawn regularly, at least every 2 weeks, says Chuck Vogt, owner of Metro Lawns and a LawnStarter pro in Atlanta. If you wait too long and then cut it too low you stress the grass and invite diseases, he adds.<\/p>    <p class=\"wp-block-paragraph\"><strong>Pro tip:<\/strong> Core aeration improves airflow and drainage, and <a href=\"https:\/\/www.lawnstarter.com\/blog\/lawn-care-2\/what-is-core-aeration\/\">annual aeration<\/a> is enough for most lawns.<\/p>    <p class=\"wp-block-paragraph\"><strong>See Related:<\/strong><\/p>    <ul class=\"wp-block-list\"> <li><p><a href=\"https:\/\/www.lawnstarter.com\/blog\/lawn-care-2\/core-aeration-vs-spike-aeration-whats-the-difference\/\">Core Aeration vs. Spike Aeration<\/a><\/p><\/li>    <li><p><a href=\"https:\/\/www.lawnstarter.com\/blog\/landscaping\/improve-drainage-in-your-yard\/\">7 Ways to Improve Drainage in Your Yard<\/a><\/p><\/li> <\/ul>    <h2 class=\"wp-block-heading\" id=\"4-why-did-pythium-blight-hit-my-lawn\">Why Did Pythium Blight Hit My Lawn?<\/h2>    <p class=\"wp-block-paragraph\">Pythium blight doesn&#8217;t appear at random \u2014 specific conditions invite it in. Understanding what triggered your outbreak helps you fix the root problem and stop it from coming back:<\/p>    <ul class=\"wp-block-list\"> <li><p><strong>Overfertilizing:<\/strong> Overfertilizing with nitrogen is one of the major causes of Pythium blight. During high-risk conditions \u2014 hot, humid weather with night temperatures above 65 degrees \u2014 cool-season turfgrasses should receive no <a target=\"_blank\" href=\"https:\/\/content.ces.ncsu.edu\/pythium-blight-in-turf\">more than 0.25 lb N per 1,000 sq ft<\/a> in a single application. <\/p><\/li>    <li><p><strong>Overwatering:<\/strong>&nbsp;Pythium pathogens thrive in moist environments. Watering too late in the evening, when grass leaves can&#8217;t dry, creates an ideal environment for disease. Excessive watering can&nbsp;also cause Pythium root rot, a more severe condition.<\/p><\/li>    <li><p><strong>Heat and humidity:<\/strong>&nbsp;According to <a target=\"_blank\" href=\"https:\/\/turfpestlab.psu.edu\/pest-profiles\/pythium-blight\/\">Penn State&#8217;s Turfgrass Pest Lab<\/a>, minimum temperatures of 68 degrees and relative humidity above 90% for at least 14 hours can trigger the disease on cool-season grasses. <\/p><\/li>    <li><p>Signs typically appear the morning after summer thunderstorms. A forecast of hot, humid nights after heavy rain should put you on high alert.<\/p><\/li>    <li><p><strong>Poor soil drainage and air circulation:<\/strong>&nbsp;Poorly draining soil can lead to Pythium blight outbreaks. Compacted soil, excessive thatch, and low calcium content are breeding grounds for the disease.<\/p><\/li>    <li><p><strong>Mowing infected grass:<\/strong>&nbsp;Pythium blight spreads to other lawn areas when infected grass is mowed. The disease can also spread via the soles of shoes.<\/p><\/li> <\/ul>    <p class=\"wp-block-paragraph\"><strong>See Related:<\/strong><\/p>    <ul class=\"wp-block-list\"> <li><p><a href=\"https:\/\/www.lawnstarter.com\/blog\/lawn-care-2\/how-often-to-water-lawn\/\">How Often Should I Water My Lawn?<\/a><\/p><\/li>    <li><p><a href=\"https:\/\/www.lawnstarter.com\/blog\/lawn-care-2\/what-causes-compacted-soil\/\">What Causes Compacted Soil?<\/a><\/p><\/li> <\/ul>    <h2 class=\"wp-block-heading\" id=\"5-when-to-stop-diy-and-call-a-lawn-pro-for-pythium-blight\">When to Stop DIY and Call a Lawn Pro for Pythium Blight<\/h2>    <figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2023\/10\/Pythium-Blight-Grease-Spot.jpg?wsr\" alt=\"Grass showing dark patches of water-soaked lesions, signaling Pythium blight infection.\" class=\"wp-image-101673\" srcset=\"https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2023\/10\/Pythium-Blight-Grease-Spot.jpg 800w, https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2023\/10\/Pythium-Blight-Grease-Spot-300x169.jpg 300w, https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2023\/10\/Pythium-Blight-Grease-Spot-646x363.jpg 646w, https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2023\/10\/Pythium-Blight-Grease-Spot-150x84.jpg 150w, https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2023\/10\/Pythium-Blight-Grease-Spot-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption class=\"wp-element-caption\">Pythium Blight Disease. Photo Credit: <a href=\"https:\/\/www.ces.ncsu.edu\/\" target=\"_blank\" rel=\"noreferrer noopener\">NC State Cooperative Extension<\/a><\/figcaption><\/figure>    <p class=\"wp-block-paragraph\">Pythium blight is one of those diseases where waiting costs you \u2014 and misidentifying it costs you even more. If you&#8217;re not 100% sure what you&#8217;re dealing with, or if the disease is actively spreading, call one of LawnStarter&#8217;s <a href=\"https:\/\/signup-web.lawnstarter.com\/cart\/contact-info?intent=fertilization\">lawn treatments pros<\/a> to check and treat your turfgrass back to health.<\/p>    <p class=\"wp-block-paragraph\">The cottony mycelium from Pythium blight can look a lot like dollar spot or <a href=\"https:\/\/www.lawnstarter.com\/blog\/lawn-care-2\/gray-leaf-spot\/\">gray leaf spot<\/a> \u2014 and brown patch can look similar too. <\/p>    <p class=\"wp-block-paragraph\">But there&#8217;s a quick field test: If you rub the affected grass blades between your fingers and they feel oily or greasy, that&#8217;s Pythium blight. Dollar spot leaves won&#8217;t feel oily.<\/p>    <p class=\"wp-block-paragraph\">This distinction matters because treatments for one disease won&#8217;t work on another, making accurate diagnosis essential.<\/p>    <p class=\"wp-block-paragraph\">Don&#8217;t let Pythium blight take over your lawn. LawnStarter&#8217;s local <a href=\"https:\/\/signup-web.lawnstarter.com\/cart\/contact-info?intent=fertilization\">lawn treatment pros<\/a> can diagnose the problem, apply the right fungicide, and help your lawn recover. Get your free quote  today.  <\/p>    <h2 class=\"wp-block-heading\" id=\"6-faqs\">FAQs<\/h2>    <div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1776707275079722\"><strong class=\"schema-faq-question\">Is Pythium Blight Harmful to Pets or Children?<\/strong> <p class=\"schema-faq-answer\">Pythium blight itself isn&#8217;t directly harmful to pets or children, but the fungicides used to treat it can be. Always follow label instructions for re-entry intervals after application. Keep pets and children off treated areas until the product has fully dried or for the time period specified on the label.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-17767072750791418\"><strong class=\"schema-faq-question\">Can Pythium Blight Spread to Other Plants in My Yard?<\/strong> <p class=\"schema-faq-answer\">Pythium species primarily target turfgrass but can also infect ornamental plants and garden vegetables in warm, wet conditions. If your lawn has an active Pythium blight outbreak, monitor nearby garden beds for signs of root rot or wilting, especially in poorly drained areas.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1776707275079569\"><strong class=\"schema-faq-question\">Does Pythium Blight Affect New Sod or Newly Seeded Lawns?<\/strong> <p class=\"schema-faq-answer\">Yes, newly seeded lawns and fresh sod are especially vulnerable to Pythium blight because young grass lacks established root systems. The frequent watering required during establishment creates ideal conditions for the pathogen. Apply a preventive fungicide labeled for Pythium before seeding or laying sod in warm, humid weather.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-17767072750793835\"><strong class=\"schema-faq-question\">How Long Before My Lawn Recovers from Pythium Blight Treatment?<\/strong> <p class=\"schema-faq-answer\"><p>Fungicides stop the spread but won&#8217;t revive dead grass \u2014 you&#8217;ll need to overseed with resistant varieties. <a href=\"https:\/\/www.lawnstarter.com\/blog\/lawn-care-2\/how-long-grass-seed-to-grow\/\">Germination timing<\/a> ranges from 3 to 30 days depending on grass type.<\/p> <\/div> <\/div>    <p class=\"wp-block-paragraph\">Main Image: White mycelium of&nbsp;Pythium&nbsp;spp. on newly seeded turfgrass. Image Credit: <a href=\"https:\/\/extension.psu.edu\/turfgrass-diseases-damping-off-diseases-causal-fungi-pythium-rhizoctonia-and-fusarium-spp\" target=\"_blank\" rel=\"noreferrer noopener\">Pete Landschoot, Penn State<\/a> \/ PennState Extension<\/p>","protected":false},"excerpt":{"rendered":"<p>Pythium blight can kill grass in a couple of days. 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Keep pets and children off treated areas until the product has fully dried or for the time period specified on the label.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.lawnstarter.com\/blog\/lawn-care-2\/pythium-blight\/#faq-question-17767072750791418","position":2,"url":"https:\/\/www.lawnstarter.com\/blog\/lawn-care-2\/pythium-blight\/#faq-question-17767072750791418","name":"Can Pythium Blight Spread to Other Plants in My Yard?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Pythium species primarily target turfgrass but can also infect ornamental plants and garden vegetables in warm, wet conditions. If your lawn has an active Pythium blight outbreak, monitor nearby garden beds for signs of root rot or wilting, especially in poorly drained areas.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.lawnstarter.com\/blog\/lawn-care-2\/pythium-blight\/#faq-question-1776707275079569","position":3,"url":"https:\/\/www.lawnstarter.com\/blog\/lawn-care-2\/pythium-blight\/#faq-question-1776707275079569","name":"Does Pythium Blight Affect New Sod or Newly Seeded Lawns?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Yes, newly seeded lawns and fresh sod are especially vulnerable to Pythium blight because young grass lacks established root systems. The frequent watering required during establishment creates ideal conditions for the pathogen. Apply a preventive fungicide labeled for Pythium before seeding or laying sod in warm, humid weather.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.lawnstarter.com\/blog\/lawn-care-2\/pythium-blight\/#faq-question-17767072750793835","position":4,"url":"https:\/\/www.lawnstarter.com\/blog\/lawn-care-2\/pythium-blight\/#faq-question-17767072750793835","name":"How Long Before My Lawn Recovers from Pythium Blight Treatment?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<p>Fungicides stop the spread but won't revive dead grass \u2014 you'll need to overseed with resistant varieties. <a href=\"https:\/\/www.lawnstarter.com\/blog\/lawn-care-2\/how-long-grass-seed-to-grow\/\">Germination timing<\/a> ranges from 3 to 30 days depending on grass type.","inLanguage":"en-US"},"inLanguage":"en-US"}]}},"_links":{"self":[{"href":"https:\/\/www.lawnstarter.com\/blog\/wp-json\/wp\/v2\/posts\/101844","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lawnstarter.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lawnstarter.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lawnstarter.com\/blog\/wp-json\/wp\/v2\/users\/158"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lawnstarter.com\/blog\/wp-json\/wp\/v2\/comments?post=101844"}],"version-history":[{"count":4,"href":"https:\/\/www.lawnstarter.com\/blog\/wp-json\/wp\/v2\/posts\/101844\/revisions"}],"predecessor-version":[{"id":148447,"href":"https:\/\/www.lawnstarter.com\/blog\/wp-json\/wp\/v2\/posts\/101844\/revisions\/148447"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.lawnstarter.com\/blog\/wp-json\/wp\/v2\/media\/101859"}],"wp:attachment":[{"href":"https:\/\/www.lawnstarter.com\/blog\/wp-json\/wp\/v2\/media?parent=101844"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lawnstarter.com\/blog\/wp-json\/wp\/v2\/categories?post=101844"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lawnstarter.com\/blog\/wp-json\/wp\/v2\/tags?post=101844"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}