{"id":939,"date":"2013-03-20T19:27:00","date_gmt":"2013-03-20T18:27:00","guid":{"rendered":"https:\/\/normandiemaine.cerfrance.fr\/arad2\/?p=939"},"modified":"2023-03-07T09:24:16","modified_gmt":"2023-03-07T08:24:16","slug":"les-melanges-varietaux-en-ble-un-levier-interessant-pour-preserver-les-resistances-genetiques-et-reduire-lusage-des-fongicides","status":"publish","type":"post","link":"https:\/\/normandiemaine.cerfrance.fr\/arad2\/les-melanges-varietaux-en-ble-un-levier-interessant-pour-preserver-les-resistances-genetiques-et-reduire-lusage-des-fongicides\/","title":{"rendered":"M\u00e9langes vari\u00e9taux en bl\u00e9"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">Les m\u00e9langes vari\u00e9taux en bl\u00e9 : un levier int\u00e9ressant pour pr\u00e9server les r\u00e9sistances g\u00e9n\u00e9tiques et r\u00e9duire l\u2019usage des fongicides !<\/h1>\n\n\n\n<p>Le <strong>semis de m\u00e9langes vari\u00e9taux en bl\u00e9 par les agriculteurs reste une pratique encore confidentielle en France<\/strong>. Ceci malgr\u00e9 un r\u00e9cent regain d\u2019int\u00e9r\u00eat li\u00e9 en partie au plan <a href=\"https:\/\/agriculture.gouv.fr\/ecophyto-reduire-et-ameliorer-lutilisation-des-phytos\" target=\"_blank\" rel=\"noreferrer noopener\">Ecophyto<\/a> et \u00e0 son objectif de r\u00e9duction de l\u2019usage des produits phytosanitaires. Le nombre de vari\u00e9t\u00e9s cultiv\u00e9es dans les parcelles agricoles est tr\u00e8s faible par rapport au choix disponible au catalogue officiel. Cela entra\u00eene une diminution de la diversit\u00e9 g\u00e9n\u00e9tique dans les campagnes. Elle n\u2019est toutefois pas sans poser probl\u00e8me pour la gestion des maladies. <\/p>\n\n\n\n<p>Les r\u00e9sistances g\u00e9n\u00e9tiques introduites actuellement dans les vari\u00e9t\u00e9s par les s\u00e9lectionneurs reposent sur un nombre restreint de g\u00e8nes tr\u00e8s sp\u00e9cifiques. Cette homog\u00e9n\u00e9it\u00e9 de r\u00e9sistance g\u00e9n\u00e9tique exerce alors une forte pression de s\u00e9lection sur les pathog\u00e8nes entra\u00eenant un contournement de la r\u00e9sistance parfois tr\u00e8s rapide. Le g\u00e8ne Yr6 contre la rouille jaune en est le parfait exemple avec un contournement d\u00e8s la premi\u00e8re ann\u00e9e de commercialisation de la vari\u00e9t\u00e9\u00a0R\u00e9cital. Une des solutions pour pr\u00e9server ces r\u00e9sistances est de <strong>r\u00e9introduire de la diversit\u00e9 soit<\/strong> :<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>inter-parcellaire<\/strong> mais on s\u2019heurte alors \u00e0 la n\u00e9cessit\u00e9 d\u2019avoir une coordination \u00e0 l\u2019\u00e9chelle territoriale pas\u00a0forc\u00e9ment simple \u00e0 mettre en \u0153uvre, <\/li><li><strong>intra-parcellaire<\/strong>. Cela peut passer par des vari\u00e9t\u00e9s multir\u00e9sistantes mais difficiles \u00e0 obtenir et \u00e0 concilier avec des g\u00e8nes de productivit\u00e9 \u00e9lev\u00e9e.<\/li><li><strong>culture de plusieurs vari\u00e9t\u00e9s<\/strong> ayant des g\u00e8nes de r\u00e9sistance diff\u00e9rents sur une m\u00eame parcelle. Ce sont les m\u00e9langes de vari\u00e9t\u00e9s. <\/li><\/ul>\n\n\n\n<p>Dans ce dossier, nous ne nous int\u00e9resserons uniquement aux <strong>r\u00e9sultats sur bl\u00e9<\/strong> :<\/p>\n\n\n<div class=\"_3d-flip-book  fb3d-fullscreen-mode full-size\" data-id=\"938\" data-mode=\"fullscreen\" data-title=\"false\" data-template=\"short-white-book-view\" data-lightbox=\"dark-shadow\" data-urlparam=\"fb3d-page\" data-page-n=\"0\" data-pdf=\"\" data-tax=\"null\" data-thumbnail=\"\" data-cols=\"3\" data-book-template=\"default\" data-trigger=\"\"><\/div><script type=\"text\/javascript\">window.FB3D_CLIENT_DATA = window.FB3D_CLIENT_DATA || 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!<\/p>\n","protected":false},"author":4,"featured_media":1947,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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