{"id":26605,"date":"2025-06-05T15:56:56","date_gmt":"2025-06-05T13:56:56","guid":{"rendered":"https:\/\/www.irbab-kbivb.be\/?p=26605"},"modified":"2025-06-05T15:56:59","modified_gmt":"2025-06-05T13:56:59","slug":"premiers-symptomes-de-maladies-foliaires-observes-dans-la-betterave-sucriere-presence-deja-confirmee-de-mildiou","status":"publish","type":"post","link":"https:\/\/www.irbab-kbivb.be\/fr\/premiers-symptomes-de-maladies-foliaires-observes-dans-la-betterave-sucriere-presence-deja-confirmee-de-mildiou\/","title":{"rendered":"Premiers sympt\u00f4mes de maladies foliaires observ\u00e9s dans la betterave sucri\u00e8re : pr\u00e9sence d\u00e9j\u00e0 confirm\u00e9e de mildiou"},"content":{"rendered":"\n<p>Les premiers signes d\u2019infections foliaires dans les champs de betteraves sucri\u00e8res ont \u00e9t\u00e9 confirm\u00e9s. Via notre service d\u2019alerte, nous avons re\u00e7u des signalements de la pr\u00e9sence de mildiou (<em>Peronospora farinosa<\/em>) dans plusieurs parcelles.<\/p>\n\n\n\n<p><strong><a href=\"https:\/\/www.irbab-kbivb.be\/wp-content\/uploads\/2025\/06\/Valse-meeldauw.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"rounded alignleft wp-image-26599 size-medium\" src=\"https:\/\/www.irbab-kbivb.be\/wp-content\/uploads\/2025\/06\/Valse-meeldauw-169x300.jpg\" alt=\"\" width=\"169\" height=\"300\" srcset=\"https:\/\/www.irbab-kbivb.be\/wp-content\/uploads\/2025\/06\/Valse-meeldauw-169x300.jpg 169w, https:\/\/www.irbab-kbivb.be\/wp-content\/uploads\/2025\/06\/Valse-meeldauw-576x1024.jpg 576w, https:\/\/www.irbab-kbivb.be\/wp-content\/uploads\/2025\/06\/Valse-meeldauw-768x1365.jpg 768w, https:\/\/www.irbab-kbivb.be\/wp-content\/uploads\/2025\/06\/Valse-meeldauw-864x1536.jpg 864w, https:\/\/www.irbab-kbivb.be\/wp-content\/uploads\/2025\/06\/Valse-meeldauw-810x1440.jpg 810w, https:\/\/www.irbab-kbivb.be\/wp-content\/uploads\/2025\/06\/Valse-meeldauw.jpg 1080w\" sizes=\"auto, (max-width: 169px) 100vw, 169px\" \/><\/a>Mildiou : sympt\u00f4mes et conditions favorables<\/strong><\/p>\n<p>Le mildiou se manifeste g\u00e9n\u00e9ralement par des taches irr\u00e9guli\u00e8res, jaunes \u00e0 vert clair, sur la face sup\u00e9rieure des feuilles. Sur la face inf\u00e9rieure de ces taches, on observe un feutrage gris\u00e2tre, parfois violac\u00e9. Dans un stade plus avanc\u00e9, les feuilles peuvent se faner et mourir pr\u00e9matur\u00e9ment, entra\u00eenant une perte de rendement. Attention, ces sympt\u00f4mes peuvent \u00e9galement ressembler \u00e0 des sympt\u00f4mes de carence en bore. En cas de carence en bore, aucun feutrage fongique n\u2019est visible.<\/p>\n<p>Le champignon se d\u00e9veloppe principalement dans des conditions humides et \u00e0 des temp\u00e9ratures mod\u00e9r\u00e9ment chaudes (entre 10 et 20 \u00b0C). Une humidit\u00e9 foliaire prolong\u00e9e due \u00e0 la ros\u00e9e, \u00e0 la pluie ou \u00e0 une humidit\u00e9 relative \u00e9lev\u00e9e (&gt;90 %) constitue un facteur critique pour l\u2019infection et la sporulation. Il n&#8217;existe aucun traitement efficace contre ce champignon.<\/p>\n<p><strong>Pas encore de signalement de cercosporiose, mais la vigilance reste de mise<\/strong><\/p>\n<p>\u00c0 ce jour, <em>Cercospora beticola<\/em>, agent responsable de la cercosporiose foliaire, n\u2019a<a href=\"https:\/\/www.irbab-kbivb.be\/wp-content\/uploads\/2025\/06\/Cercospora.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"rounded alignright wp-image-26603 size-full\" src=\"https:\/\/www.irbab-kbivb.be\/wp-content\/uploads\/2025\/06\/Cercospora.jpg\" alt=\"\" width=\"192\" height=\"232\" \/><\/a> pas encore \u00e9t\u00e9 d\u00e9tect\u00e9. Les temp\u00e9ratures nocturnes actuelles semblent encore trop basses pour permettre le d\u00e9veloppement optimal de ce pathog\u00e8ne. <em>Cercospora<\/em> n\u00e9cessite des temp\u00e9ratures entres 15-30\u00b0C et une humidit\u00e9 \u00e9lev\u00e9e pour se propager.<\/p>\n<p>Toutefois, il est essentiel de rester vigilant. Une d\u00e9tection pr\u00e9coce est cruciale : une premi\u00e8re application de fongicides juste apr\u00e8s l\u2019apparition des premiers sympt\u00f4mes permet en g\u00e9n\u00e9ral une meilleure ma\u00eetrise. Les traitements pr\u00e9ventifs en l\u2019absence de sympt\u00f4mes sont d\u00e9conseill\u00e9s : cette approche n\u2019a pas d\u00e9montr\u00e9 d\u2019effet sur le d\u00e9veloppement de la maladie et ne fait qu\u2019augmenter les co\u00fbts et la pression de s\u00e9lection des r\u00e9sistances.<\/p>\n<p>\u00a0<\/p>\n\n\n\n<p><strong><a href=\"https:\/\/www.irbab-kbivb.be\/wp-content\/uploads\/2025\/06\/Pseudomonas.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"rounded alignleft wp-image-26601 size-full\" src=\"https:\/\/www.irbab-kbivb.be\/wp-content\/uploads\/2025\/06\/Pseudomonas.jpg\" alt=\"\" width=\"258\" height=\"292\" \/><\/a>Attention \u00e0 la confusion avec <em>Pseudomonas<\/em><\/strong><\/p>\n<p>Les sympt\u00f4mes caus\u00e9s par <em>Pseudomonas syringae<\/em>, une bact\u00e9rie pathog\u00e8ne, peuvent ressembler visuellement \u00e0 ceux de la cercosporiose. Les taches sont g\u00e9n\u00e9ralement irr\u00e9guli\u00e8res, avec un bord fonc\u00e9 large entourant un centre gris. Ces taches deviennent ensuite n\u00e9crotiques. Pseudomonas se d\u00e9veloppe par temps froid et humide, souvent en d\u00e9but de saison.<\/p>\n<p>\u00c9tant donn\u00e9 qu\u2019il s\u2019agit d\u2019une bact\u00e9rie, les fongicides sont inefficaces. Il est donc essentiel de poser un diagnostic pr\u00e9cis afin d\u2019\u00e9viter des traitements inadapt\u00e9s et inefficaces.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les premiers signes d\u2019infections foliaires dans les champs de betteraves sucri\u00e8res ont \u00e9t\u00e9 confirm\u00e9s. Via notre service d\u2019alerte, nous avons re\u00e7u des signalements de la pr\u00e9sence de mildiou (Peronospora farinosa) dans plusieurs parcelles. Mildiou : sympt\u00f4mes et conditions favorables Le mildiou se manifeste g\u00e9n\u00e9ralement par des taches irr\u00e9guli\u00e8res, jaunes \u00e0 vert clair, sur la face [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":13,"footnotes":""},"categories":[2,221],"tags":[243],"class_list":["post-26605","post","type-post","status-publish","format-standard","hentry","category-betterave","category-maladies-foliaires","tag-messages"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Premiers sympt\u00f4mes de maladies foliaires observ\u00e9s dans la betterave sucri\u00e8re : pr\u00e9sence d\u00e9j\u00e0 confirm\u00e9e de mildiou - IRBAB-KBIVB<\/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:\/\/www.irbab-kbivb.be\/fr\/premiers-symptomes-de-maladies-foliaires-observes-dans-la-betterave-sucriere-presence-deja-confirmee-de-mildiou\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Premiers sympt\u00f4mes de maladies foliaires observ\u00e9s dans la betterave sucri\u00e8re : pr\u00e9sence d\u00e9j\u00e0 confirm\u00e9e de mildiou - IRBAB-KBIVB\" \/>\n<meta property=\"og:description\" content=\"Les premiers signes d\u2019infections foliaires dans les champs de betteraves sucri\u00e8res ont \u00e9t\u00e9 confirm\u00e9s. Via notre service d\u2019alerte, nous avons re\u00e7u des signalements de la pr\u00e9sence de mildiou (Peronospora farinosa) dans plusieurs parcelles. Mildiou : sympt\u00f4mes et conditions favorables Le mildiou se manifeste g\u00e9n\u00e9ralement par des taches irr\u00e9guli\u00e8res, jaunes \u00e0 vert clair, sur la face [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.irbab-kbivb.be\/fr\/premiers-symptomes-de-maladies-foliaires-observes-dans-la-betterave-sucriere-presence-deja-confirmee-de-mildiou\/\" \/>\n<meta property=\"og:site_name\" content=\"IRBAB-KBIVB\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-05T13:56:56+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-06-05T13:56:59+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.irbab-kbivb.be\/wp-content\/uploads\/2025\/06\/Valse-meeldauw.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1080\" \/>\n\t<meta property=\"og:image:height\" content=\"1920\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Marion\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Marion\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.irbab-kbivb.be\\\/fr\\\/premiers-symptomes-de-maladies-foliaires-observes-dans-la-betterave-sucriere-presence-deja-confirmee-de-mildiou\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.irbab-kbivb.be\\\/fr\\\/premiers-symptomes-de-maladies-foliaires-observes-dans-la-betterave-sucriere-presence-deja-confirmee-de-mildiou\\\/\"},\"author\":{\"name\":\"Marion\",\"@id\":\"https:\\\/\\\/www.irbab-kbivb.be\\\/#\\\/schema\\\/person\\\/dad6fe34d3ac93cce3720797f132a2e5\"},\"headline\":\"Premiers sympt\u00f4mes de maladies foliaires observ\u00e9s dans la betterave sucri\u00e8re : pr\u00e9sence d\u00e9j\u00e0 confirm\u00e9e de mildiou\",\"datePublished\":\"2025-06-05T13:56:56+00:00\",\"dateModified\":\"2025-06-05T13:56:59+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.irbab-kbivb.be\\\/fr\\\/premiers-symptomes-de-maladies-foliaires-observes-dans-la-betterave-sucriere-presence-deja-confirmee-de-mildiou\\\/\"},\"wordCount\":456,\"image\":{\"@id\":\"https:\\\/\\\/www.irbab-kbivb.be\\\/fr\\\/premiers-symptomes-de-maladies-foliaires-observes-dans-la-betterave-sucriere-presence-deja-confirmee-de-mildiou\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.irbab-kbivb.be\\\/wp-content\\\/uploads\\\/2025\\\/06\\\/Valse-meeldauw-169x300.jpg\",\"keywords\":[\"Messages\"],\"articleSection\":[\"Betterave\",\"Maladies foliaires\"],\"inLanguage\":\"fr-FR\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.irbab-kbivb.be\\\/fr\\\/premiers-symptomes-de-maladies-foliaires-observes-dans-la-betterave-sucriere-presence-deja-confirmee-de-mildiou\\\/\",\"url\":\"https:\\\/\\\/www.irbab-kbivb.be\\\/fr\\\/premiers-symptomes-de-maladies-foliaires-observes-dans-la-betterave-sucriere-presence-deja-confirmee-de-mildiou\\\/\",\"name\":\"Premiers sympt\u00f4mes de maladies foliaires observ\u00e9s dans la betterave sucri\u00e8re : pr\u00e9sence d\u00e9j\u00e0 confirm\u00e9e de mildiou - 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Via notre service d\u2019alerte, nous avons re\u00e7u des signalements de la pr\u00e9sence de mildiou (Peronospora farinosa) dans plusieurs parcelles. 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