{"id":9167,"date":"2026-05-11T11:34:27","date_gmt":"2026-05-11T10:34:27","guid":{"rendered":"https:\/\/bio-grow.com\/?p=9167"},"modified":"2026-05-11T11:34:27","modified_gmt":"2026-05-11T10:34:27","slug":"pestalotiopsis-on-strawberry-against-this-fungus-prevention-is-your-only-real-weapon","status":"publish","type":"post","link":"https:\/\/bio-grow.com\/en\/agronomy-field\/pestalotiopsis-on-strawberry-against-this-fungus-prevention-is-your-only-real-weapon\/","title":{"rendered":"Pestalotiopsis on strawberry: against this fungus, prevention is your only real weapon."},"content":{"rendered":"<style>\n.bgart-hero-wrap{\n  width:100%;\n  height:500px;\n  border-radius:10px;\n  overflow:hidden;\n  margin-bottom:48px;\n  position:relative;\n}\n.bgart-hero-wrap img{\n  width:100%;\n  height:100%;\n  object-fit:cover;\n  object-position:center;\n  display:block;\n}\n.bgart-hero-overlay{\n  position:absolute;\n  inset:0;\n  background:linear-gradient(to bottom, rgba(0,0,0,0.15) 0%, 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.bgart-cite{text-align:left;display:flex;align-items:center;gap:14px;font-size:12.5px;font-weight:700;color:#1170a0;font-style:normal;text-transform:uppercase;letter-spacing:.07em;margin-top:4px}\n.bgart .bgart-cite::before{content:'';display:block;width:36px;height:2px;min-width:36px;background:#1170a0}\n.bgart .bgart-list{list-style:none!important;padding:0!important;margin:24px 0 30px!important;background:#f6fbfb;border-radius:6px;overflow:hidden;border:1px solid #d4eaea}\n.bgart .bgart-list li{display:flex!important;align-items:flex-start!important;gap:14px;padding:13px 22px!important;font-size:15px!important;color:#444!important;border-bottom:1px solid #e0eded!important;line-height:1.6;background:none!important;margin:0!important}\n.bgart .bgart-list li:last-child{border-bottom:none!important}\n.bgart .bgart-list li::before{content:''!important;display:inline-block!important;width:8px!important;height:8px!important;min-width:8px;background:#006465!important;border-radius:50%!important;border:none!important;margin-top:6px;flex-shrink:0}\n.bgart .bgart-alert{border:1px solid #ecd8a0;border-left:5px solid #c98a1a;background:#fefcf3;border-radius:5px;padding:28px 32px;margin:38px 0}\n.bgart .bgart-alert-label{font-size:11px!important;font-weight:800!important;text-transform:uppercase;letter-spacing:.1em;color:#b07010!important;margin:0 0 16px!important;display:flex;align-items:center;gap:8px}\n.bgart .bgart-alert-label::before{content:'\u26a0';font-size:15px}\n.bgart .bgart-alert ul{list-style:none!important;padding:0!important;margin:0!important}\n.bgart .bgart-alert ul li{padding:11px 0 11px 22px!important;font-size:14.5px!important;color:#555!important;border-bottom:1px dashed #ecd8a0!important;position:relative;line-height:1.75;background:none!important;margin:0!important}\n.bgart .bgart-alert ul li:last-child{border-bottom:none!important}\n.bgart .bgart-alert ul li::before{content:'\u203a'!important;position:absolute!important;left:4px;top:10px;color:#c98a1a!important;font-weight:900;font-size:17px;background:none!important;width:auto!important;height:auto!important;border-radius:0!important;border:none!important}\n.bgart .bgart-keyphrase{font-size:17px!important;font-weight:600!important;color:#005253!important;text-align:center;padding:22px 32px!important;background:#eef6f6;border-radius:6px;margin:36px 0;line-height:1.65;border:1px solid #c0dfdf;font-style:italic}\n.bgart figure{margin:36px 0 0}\n.bgart .bgart-img{width:100%;border-radius:8px;display:block;object-fit:cover;max-height:320px}\n.bgart figcaption{font-size:12px!important;color:#999!important;text-align:center;margin-top:8px!important;margin-bottom:32px!important;font-style:italic;line-height:1.5}\n@media screen and (max-width:768px){.bgart .bgart-quote{padding:26px 20px 22px 28px}.bgart h2{font-size:18px!important}.bgart .bgart-chapeau{font-size:15.5px!important}.bgart .bgart-keyphrase{font-size:15px!important;padding:18px 20px}.bgart .bgart-alert{padding:22px 20px}}\n<\/style>\n<div class=\"bgart-hero-wrap\">\n  <img decoding=\"async\" src=\"https:\/\/bio-grow.com\/wp-content\/uploads\/2026\/05\/culture-fraise.jpg\" alt=\"Strawberry crop under cover affected by Pestalotiopsis\" \/><\/p>\n<div class=\"bgart-hero-overlay\"><\/div>\n<div class=\"bgart-hero-title\">\n    Pestalotiopsis on strawberry: against this fungus,<br \/>prevention is your only real weapon.\n  <\/div>\n<\/div>\n<div class=\"bgart\">\n<div class=\"bgart-tags\">\n    <span class=\"bgart-tag\">Technical<\/span><br \/>\n    <span class=\"bgart-tag\">Strawberry<\/span><br \/>\n    <span class=\"bgart-tag\">Phytopathology<\/span><br \/>\n    <span class=\"bgart-tag\">Substrate &amp; Field<\/span>\n  <\/div>\n<p class=\"bgart-chapeau\">Through our visits to strawberry growers across southern France, we have witnessed first-hand how severely Pestalotiopsis is disrupting operations. Described as a major problem in many producing countries \u2014 China, Mexico, Spain, Italy \u2014 it gained significant ground in France as early as 2024 and continues to spread. What makes this fungus particularly dangerous is that it often establishes itself silently, long before the first visible symptoms alert the grower.<\/p>\n<p>  <!-- IMAGE 1 --><\/p>\n<figure>\n    <img decoding=\"async\" src=\"https:\/\/bio-grow.com\/wp-content\/uploads\/2026\/05\/fraises_new-growing-systems-3.jpg\" alt=\"Strawberry plants growing under cover\" class=\"bgart-img\" \/><figcaption>Whether in field soil or substrate systems, no growing method is spared by Pestalotiopsis \u2014 vigilance is essential from the moment of planting.<\/figcaption><\/figure>\n<h2 style=\"text-transform:uppercase\">An opportunistic fungus with progressive, deceptive symptoms<\/h2>\n<p>Pestalotiopsis \u2014 whose full scientific name is <em>Neopestalotiopsis clavispora<\/em> \u2014 is an opportunistic fungus that preferentially establishes itself following plant stress or injury. It thrives in warm, humid conditions: precisely the environment found under protected structures during peak production periods.<\/p>\n<p>The first symptoms appear on leaves as small brown-beige spots surrounded by a darker border. These spots gradually enlarge as the fungus sporulates, and black pycnidia can be observed on their surface.<\/p>\n<p>What makes early detection so challenging is that the plant does not wilt immediately. Initially, symptoms remain foliar and discreet. They can easily be confused with phytotoxicity or other fungal crown infections such as <em>Phytophthora cactorum<\/em>. It is only after the full expression of aerial signs that the plant enters progressive decline \u2014 primarily around flowering and towards the end of the cycle.<\/p>\n<div class=\"bgart-quote\">\n<p>What I have learned to recognise in the field is that Pestalotiopsis never manifests itself in a clear and immediate way. You first notice a plant that is slightly less vigorous than its neighbours, a few spots on a leaf \u2014 and you hesitate. Is it heat stress? Salt excess? This hesitation costs time, and with this fungus, time systematically works against the grower.<\/p>\n<p>    <span class=\"bgart-cite\">Mickael, Technical Advisor \u2014 Biogrow<\/span>\n  <\/div>\n<h2 style=\"text-transform:uppercase\">Damage that spreads from leaf to fruit<\/h2>\n<p>  <!-- IMAGE 2 --><\/p>\n<figure>\n    <img decoding=\"async\" src=\"https:\/\/bio-grow.com\/wp-content\/uploads\/2026\/05\/pestalo-fraises-en.jpg\" alt=\"Foliar symptoms of Pestalotiopsis on strawberry plant\" class=\"\" \/><figcaption>The brown-beige spots with a dark border on leaves are often the first visible signal of Pestalotiopsis contamination.<\/figcaption><\/figure>\n<p>The fungus is not limited to foliage. It causes progressive weakening and rot of the root system \u2014 even though the roots often remain visually healthy during the first weeks, which further complicates diagnosis. Leaf browning intensifies around flowering, and dieback becomes widespread as harvest approaches.<\/p>\n<p>The fruit itself is not spared. Fine brown spots of 2 to 4 mm appear first, then develop into large brown-black lesions with visible fungal fruiting bodies on the surface. Fruit eventually rots or mummifies, causing direct commercial losses on top of the loss of plants.<\/p>\n<p>Ultimately, Pestalotiopsis is responsible for generalised plant decline affecting both field and substrate growing systems \u2014 no production method is exempt.<\/p>\n<h2 style=\"text-transform:uppercase\">A fungus invisible at transplant reception<\/h2>\n<p>This is one of the most problematic aspects of this disease: at the time of receiving a contaminated young plant, it is impossible to identify the infection visually. Contamination is latent, and its development will be entirely determined by the climatic and agronomic conditions that follow transplanting.<\/p>\n<p>Overcast, warm, and humid conditions under cover provide the ideal environment for the pathogen to express itself. Added to this are any hydric or nutritional stresses \u2014 excessively high electrical conductivity in particular \u2014 which weaken the plant and make it far more vulnerable to fungal colonisation.<\/p>\n<div class=\"bgart-alert\">\n<p class=\"bgart-alert-label\">Factors that promote Pestalotiopsis development<\/p>\n<ul>\n<li><strong>High humidity under cover<\/strong> \u2014 prolonged warm and humid conditions, insufficient ventilation<\/li>\n<li><strong>Hydric and saline stress<\/strong> \u2014 excessively high electrical conductivity in the nutrient solution<\/li>\n<li><strong>Plant injuries<\/strong> \u2014 handling during crop management, mechanical damage<\/li>\n<li><strong>Non-disinfected recycling<\/strong> \u2014 recirculated nutrient solutions without irrigation water treatment<\/li>\n<li><strong>Unreplaced substrate<\/strong> \u2014 continued use of substrate previously exposed to contamination<\/li>\n<\/ul><\/div>\n<h2 style=\"text-transform:uppercase\">Prevention: the only truly effective lever<\/h2>\n<p>  <!-- IMAGE 3 --><\/p>\n<figure>\n    <img decoding=\"async\" src=\"https:\/\/bio-grow.com\/wp-content\/uploads\/2026\/05\/champ-de-culture-de-fraise-hors-sol.jpg\" alt=\"Strawberry substrate cultivation under controlled conditions\" class=\"bgart-img\"\/><figcaption>Control of climate, irrigation, and substrate renewal is the best available protection against Pestalotiopsis.<\/figcaption><\/figure>\n<p>Against this fungus, prevention remains the only truly reliable weapon. The following prophylactic measures help create an environment unfavourable to its development and maintain vigorous plants \u2014 which is the first line of defence:<\/p>\n<ul class=\"bgart-list\">\n<li>Ensure maximum ventilation under cover to control humidity levels<\/li>\n<li>Maintain precise nutrition management and avoid any hydric or saline stress (controlled conductivity)<\/li>\n<li>Implement water disinfection if nutrient solution recycling is practised<\/li>\n<li>Inspect plants regularly, particularly around the flowering period<\/li>\n<li>Remove promptly any plant material showing suspicious symptoms<\/li>\n<li>Systematically renew substrates after any season that has experienced contamination<\/li>\n<\/ul>\n<p class=\"bgart-keyphrase\">Good climate control, precise nutrition, unstressed plants \u2014 this is the best phytosanitary tool available against Pestalotiopsis.<\/p>\n<h2 style=\"text-transform:uppercase\">When contamination is confirmed: what to do in practice?<\/h2>\n<p>Let us be direct on this point: to date, no curative method has demonstrated sufficient efficacy to control Pestalotiopsis once it is firmly established on a farm. There is no miracle solution.<\/p>\n<p>That said, inaction is never the right response. From the first signs of suspicion, it is essential to act without delay. Applications \u2014 whether based on approved fungicides or biocontrol products \u2014 must be carried out in such a way that the product runs down over the entire plant and into its crown. These treatments will not eradicate the fungus, but they can help slow its progression and protect plants that are still unaffected.<\/p>\n<p>Biocontrol products, particularly those based on <em>Bacillus<\/em> spp., are the subject of active research and show early promising results. Their actual efficacy under growing conditions, however, still needs to be documented more precisely \u2014 we will keep you informed as results develop.<\/p>\n<p>  <!-- FINAL CTA BLOCK --><\/p>\n<div style=\"background:linear-gradient(145deg,#004d4e 0%,#006465 55%,#007a7c 100%);border-radius:10px;padding:48px 52px;margin:56px 0 36px;box-shadow:0 10px 40px rgba(0,100,101,.22);\">\n<h2 style=\"text-transform:uppercase;color:#ffffff!important;border-bottom:1px solid rgba(255,255,255,0.22)!important;font-size:20px!important;margin-top:0!important;padding-bottom:16px!important;margin-bottom:26px!important;\">Our field commitment against Pestalotiopsis<\/h2>\n<p style=\"color:rgba(255,255,255,0.88)!important;font-size:15.5px!important;margin-bottom:18px!important;\">Pestalotiopsis confronts us with a reality the field imposes season after season: prevention is not a luxury, it is a necessity. A clean, renewed substrate with the right agronomic properties directly contributes to maintaining favourable root conditions for vigorous, resilient plants.<\/p>\n<p style=\"color:rgba(255,255,255,0.88)!important;font-size:15.5px!important;margin-bottom:18px!important;\">If you are observing suspicious symptoms on your farm, or if you would like to review your prevention protocols \u2014 ventilation, nutrition management, substrate renewal \u2014 our technical advisors are available to support you directly in the field.<\/p>\n<p>    <span style=\"display:block;background:rgba(255,255,255,0.10);border-left:3px solid rgba(255,255,255,0.45);border-radius:0 5px 5px 0;padding:16px 22px;font-size:15px;color:#ffffff!important;font-style:italic;margin:26px 0 32px;\">The key to success remains the same season after season: prevention beats cure. A vigorous plant, grown in a healthy, renewed substrate, is always the best defence against fungal disease.<\/span><\/p>\n<p>    <a href=\"https:\/\/bio-grow.com\/nous-contacter\/\" style=\"display:inline-block;background:#ffffff;color:#006465!important;text-decoration:none!important;padding:5% 5%;border-radius:5px;font-size:13.5px;font-weight:800;letter-spacing:.06em;text-transform:uppercase;box-shadow:0 4px 18px rgba(0,0,0,.18);font-family:'Poppins',Helvetica,Arial,sans-serif;\">Contact a technical advisor \u2192<\/a><\/p><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Pestalotiopsis on strawberry: against this fungus,prevention is your only real weapon. Technical Strawberry Phytopathology Substrate &amp; Field Through our visits to strawberry growers across southern France, we have witnessed first-hand how severely Pestalotiopsis is disrupting operations. Described as a major problem in many producing countries \u2014 China, Mexico, Spain, Italy \u2014 it gained significant ground [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[56],"tags":[],"class_list":["post-9167","post","type-post","status-publish","format-standard","hentry","category-agronomy-field"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Pestalotiopsis on strawberry: against this fungus, prevention is your only real weapon. - Biogrow<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/bio-grow.com\/en\/agronomy-field\/pestalotiopsis-on-strawberry-against-this-fungus-prevention-is-your-only-real-weapon\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pestalotiopsis on strawberry: against this fungus, prevention is your only real weapon. - Biogrow\" \/>\n<meta property=\"og:description\" content=\"Pestalotiopsis on strawberry: against this fungus,prevention is your only real weapon. Technical Strawberry Phytopathology Substrate &amp; Field Through our visits to strawberry growers across southern France, we have witnessed first-hand how severely Pestalotiopsis is disrupting operations. 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Technical Strawberry Phytopathology Substrate &amp; Field Through our visits to strawberry growers across southern France, we have witnessed first-hand how severely Pestalotiopsis is disrupting operations. 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