{"id":2899,"date":"2023-10-25T08:48:39","date_gmt":"2023-10-25T06:48:39","guid":{"rendered":"https:\/\/normandiemaine.cerfrance.fr\/arad2\/?p=2899"},"modified":"2023-11-30T19:09:14","modified_gmt":"2023-11-30T18:09:14","slug":"gestion-du-vulpin-et-changement-climatique","status":"publish","type":"post","link":"https:\/\/normandiemaine.cerfrance.fr\/arad2\/gestion-du-vulpin-et-changement-climatique\/","title":{"rendered":"Gestion du vulpin et changement climatique"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">Lutte contre le vulpin et changement climatique&nbsp;: adapter les strat\u00e9gies pour continuer \u00e0 le ma\u00eetriser<\/h1>\n\n\n\n<p class=\"has-medium-font-size\">D\u00e9couvrez comment le changement climatique impacte le vulpin et l&rsquo;efficacit\u00e9 des leviers agronomiques pour le g\u00e9rer<\/p>\n\n\n\n<p class=\"has-text-align-justify\">Le vulpin est une adventice de plus en plus pr\u00e9sente dans les parcelles et ce m\u00eame \u00e0 des p\u00e9riodes o\u00f9 on ne le voyait pas il y a encore 20 ans. Le vulpin est une adventice dite automnale et plut\u00f4t inf\u00e9od\u00e9 \u00e0 des syst\u00e8mes \u00e0 dominante cultures d\u2019hiver. Toutefois, on constate ces derni\u00e8res ann\u00e9es une expansion du vulpin dans les parcelles. Outre l\u2019apparition de r\u00e9sistances et d\u2019une moindre efficacit\u00e9 des herbicides, une des explications semble li\u00e9e au changement climatique. En effet, l\u2019augmentation des temp\u00e9ratures et le changement des r\u00e9gimes de pluie ont eu des cons\u00e9quences sur la biologie du vulpin notamment sur sa p\u00e9riode de lev\u00e9e pr\u00e9f\u00e9rentielle. Pour le Nord de le France, cela se traduit par une p\u00e9riode de lev\u00e9e plus tardive \u00e0 l\u2019automne et un peu plus \u00e9tal\u00e9e sur le printemps.<\/p>\n\n\n\n<p class=\"has-text-align-justify\">Ces modifications peuvent avoir des cons\u00e9quences sur l\u2019efficacit\u00e9 des leviers de gestion actuels du vulpin&nbsp;: d\u00e9calage de date de semis, rotation avec alternance cultures hiver et cultures de printemps ou encore faux semis. Il s\u2019agira donc d\u2019\u00eatre d\u2019autant plus r\u00e9actif pour adapter sa strat\u00e9gie de gestion des vulpins aux conditions climatiques de l\u2019ann\u00e9e et combiner les leviers pour maximiser leurs effets. Et dans le cas d\u2019infestation forte, ne pas h\u00e9siter \u00e0 utiliser des leviers \u00ab&nbsp;pompiers&nbsp;\u00bb.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Changement climatique et lev\u00e9e de vulpins<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Biologie du vulpin<\/h3>\n\n\n\n<p class=\"has-text-align-justify\">Pour germer, les graines d\u2019adventices ont besoin d\u2019un certain niveau de potentiel hydrique du sol et de temp\u00e9rature de base diff\u00e9rents selon les esp\u00e8ces (cf graphique ci-dessous). Plus on est proche des 0, moins les conditions de germination sont restrictives. Ainsi, les adventices estivales (digitaire, morelle\u2026) ont surtout besoin de temp\u00e9rature quand les adventices automnales (g\u00e9ranium, gaillet\u2026) ont davantage besoin d&rsquo;humidit\u00e9 que de temp\u00e9rature.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img data-recalc-dims=\"1\" fetchpriority=\"high\" decoding=\"async\" width=\"508\" height=\"386\" src=\"https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/10\/conditions-germinations-adventices.png?resize=508%2C386&#038;ssl=1\" alt=\"conditions germination adventices\" class=\"wp-image-2902\" srcset=\"https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/10\/conditions-germinations-adventices.png?w=508&amp;ssl=1 508w, https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/10\/conditions-germinations-adventices.png?resize=300%2C228&amp;ssl=1 300w\" sizes=\"(max-width: 508px) 100vw, 508px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-justify\">Concernant le vulpin, sa strat\u00e9gie de survie est principalement li\u00e9e \u00e0 des conditions de germination peu restrictives, une dormance faible et une production de graines importante (500 \u00e0 5000 graines par plante). A l\u2019inverse, les graines de vulpin restent peu longtemps viables dans le sol soit environ 3 ans. Cela s\u2019explique par une paroi de graine peu \u00e9paisse.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>De plus en plus de vulpins, y compris \u00e0 des p\u00e9riodes jusque-l\u00e0 peu propices au vulpin<\/strong><\/h3>\n\n\n\n<p>Diff\u00e9rentes hypoth\u00e8ses peuvent expliquer ce ph\u00e9nom\u00e8ne&nbsp;:<\/p>\n\n\n\n<p class=\"has-text-align-justify\">(1) Une \u00e9volution des pratiques culturales&nbsp;: diminution du travail du sol, augmentation de l\u2019azote min\u00e9ral au cours de la seconde moiti\u00e9 du 20<sup>\u00e8me<\/sup> si\u00e8cle (puis stabilisation dans les ann\u00e9es 90), date de semis des c\u00e9r\u00e9ales plus pr\u00e9coce, \u00e9volution des programmes et p\u00e9riodes d\u2019application des herbicides (du printemps vers l\u2019automne)<\/p>\n\n\n\n<p>(2) L\u2019apparition de r\u00e9sistances aux mol\u00e9cules entra\u00eenant une moindre efficacit\u00e9 des herbicides<\/p>\n\n\n\n<p>(3) Le changement climatique avec une augmentation des temp\u00e9ratures et des \u00e9pisodes de pluies plus capricieux.<\/p>\n\n\n\n<p>Cela a pour cons\u00e9quence&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>une modification de la p\u00e9riode de lev\u00e9e pr\u00e9f\u00e9rentielle<\/li>\n\n\n\n<li>une \u00e9volution des \u00e9cotypes&nbsp;: apparition de populations de vulpin avec des g\u00e9n\u00e9tiques distinctes fonction des syst\u00e8mes de culture et des pratiques<\/li>\n\n\n\n<li>un accroissement des populations<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Une modification de la courbe de lev\u00e9e pr\u00e9f\u00e9rentielle du vulpin due au changement climatique<\/strong><\/h3>\n\n\n\n<p class=\"has-text-align-justify\">Le projet ADVENTURH pilot\u00e9 par Agrotransfert a permis une mise \u00e0 jour de la courbe de lev\u00e9e pr\u00e9f\u00e9rentielle du vulpin (cf graphique ci-dessous). A noter qu\u2019elle n\u2019est valable que pour le Nord de la France et doit encore \u00eatre confirm\u00e9e. D\u2019une part, les lev\u00e9es automnales de vulpin historiquement tr\u00e8s concentr\u00e9es entre mi septembre et mi octobre sont maintenant plus \u00e9tal\u00e9es d\u2019ao\u00fbt et d\u00e9cembre. D\u2019autre part, le pic de lev\u00e9e au printemps et plus important.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img data-recalc-dims=\"1\" decoding=\"async\" width=\"956\" height=\"495\" src=\"https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/10\/modification-courbe-preferentielle-vulpin.png?resize=956%2C495&#038;ssl=1\" alt=\"modification courbe pr\u00e9f\u00e9rentielle vulpin\" class=\"wp-image-2903\" srcset=\"https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/10\/modification-courbe-preferentielle-vulpin.png?w=956&amp;ssl=1 956w, https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/10\/modification-courbe-preferentielle-vulpin.png?resize=300%2C155&amp;ssl=1 300w, https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/10\/modification-courbe-preferentielle-vulpin.png?resize=768%2C398&amp;ssl=1 768w\" sizes=\"(max-width: 956px) 100vw, 956px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-justify\">Le changement climatique a \u00e9galement pour cons\u00e9quence une variabilit\u00e9 interannuelle plus importante des conditions climatiques permettant ou non la germination des graines d\u2019adventices. Cela rend d\u2019autant plus compliqu\u00e9 la choix des leviers de gestion \u00e0 activer.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Cons\u00e9quences du changement climatique sur la gestion du vulpin<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Des leviers impact\u00e9s par le changement climatique<\/strong><\/h3>\n\n\n\n<p class=\"has-text-align-justify\">Le sch\u00e9ma ci-dessous reprend l\u2019ensemble des leviers de gestion des vulpins. Les leviers gris\u00e9s sont ceux dont l\u2019efficacit\u00e9 ou la mise en \u0153uvre peut \u00eatre impact\u00e9e par le changement climatique.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img data-recalc-dims=\"1\" decoding=\"async\" width=\"1024\" height=\"464\" src=\"https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/10\/leviers-de-gestion-du-vulpin-1.png?resize=1024%2C464&#038;ssl=1\" alt=\"leviers de gestion du vulpin\" class=\"wp-image-2905\" srcset=\"https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/10\/leviers-de-gestion-du-vulpin-1.png?resize=1024%2C464&amp;ssl=1 1024w, https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/10\/leviers-de-gestion-du-vulpin-1.png?resize=300%2C136&amp;ssl=1 300w, https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/10\/leviers-de-gestion-du-vulpin-1.png?resize=768%2C348&amp;ssl=1 768w, https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/10\/leviers-de-gestion-du-vulpin-1.png?w=1141&amp;ssl=1 1141w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-justify\">Les leviers \u00ab&nbsp;date de semis&nbsp;\u00bb et \u00ab&nbsp;rotation diversifi\u00e9e&nbsp;\u00bb restent toutefois \u00e0 activer. Ainsi, d\u00e9caler la date de semis des c\u00e9r\u00e9ales apr\u00e8s le 20 octobre reste pr\u00e9f\u00e9rable \u00e0 un semis plus pr\u00e9coce. En effet, ce d\u00e9calage permet toujours d\u2019\u00e9viter le pic de lev\u00e9e pr\u00e9f\u00e9rentielle du vulpin m\u00eame si aujourd\u2019hui des lev\u00e9es en novembre\/d\u00e9cembre sont possibles. De plus, une rotation avec des cultures d\u2019hiver et de printemps permet de ne pas trop sp\u00e9cialiser la flore adventice et le cas \u00e9ch\u00e9ant, de se donner l\u2019opportunit\u00e9 de pouvoir varier les mol\u00e9cules herbicides.<\/p>\n\n\n\n<p>Et dans tous les cas, il faut multiplier les leviers pour maximiser leurs effets.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Une adaptation des leviers aux conditions de l\u2019ann\u00e9e<\/strong><\/h3>\n\n\n\n<p class=\"has-text-align-justify\">La variabilit\u00e9 de la m\u00e9t\u00e9o coupl\u00e9e \u00e0 la pression vulpins croissante incite, en plus d\u2019une multiplicit\u00e9 des leviers de gestion, \u00e0 une plus grande adaptabilit\u00e9 du syst\u00e8me de culture et des pratiques. Par exemple, en conditions d\u2019humidit\u00e9 du sol suffisante (mais avec un sol ressuy\u00e9), le faux semis peut \u00eatre un levier int\u00e9ressant pour r\u00e9duire le nombre de graines pouvant germer au moment du semis de la c\u00e9r\u00e9ale. A l\u2019inverse, en conditions s\u00e8ches, le faux semis sera contreproductif, le risque \u00e9tant de provoquer des lev\u00e9es de vulpin au moment du semis de la c\u00e9r\u00e9ale. Dans ce cas, une strat\u00e9gie d\u2019enfouissement des graines par un labour peut s\u2019av\u00e9rer plus int\u00e9ressante.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"610\" height=\"213\" src=\"https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/10\/adaptation-levier-vulpin-aux-conditions-annee.png?resize=610%2C213&#038;ssl=1\" alt=\"adaptation levier vulpin aux conditions ann\u00e9e\" class=\"wp-image-2906\" srcset=\"https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/10\/adaptation-levier-vulpin-aux-conditions-annee.png?w=610&amp;ssl=1 610w, https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/10\/adaptation-levier-vulpin-aux-conditions-annee.png?resize=300%2C105&amp;ssl=1 300w\" sizes=\"(max-width: 610px) 100vw, 610px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Des leviers \u00ab&nbsp;pompiers&nbsp;\u00bb \u00e0 activer en cas de forte infestation<\/strong><\/h3>\n\n\n\n<p>Dans le cas de parcelles \u00e0 forte infestation, l\u2019agriculteur peut activer des leviers moins communs.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Ecimage des \u00e9pis de vulpin<\/strong><\/h4>\n\n\n\n<p class=\"has-text-align-justify\">L\u2019\u00e9cimage des \u00e9pis de vulpins peut \u00eatre une solution annuelle pour faire face \u00e0 un \u00e9chec des autres leviers. Dans la majorit\u00e9 des cas, aujourd\u2019hui, les agriculteurs r\u00e9alisent un seul \u00e9cimage par saison avec un r\u00e9glage de coupe \u00e0 environ 5-7 cm au dessus de la culture. Le projet COPRAA a test\u00e9 d\u2019autres options&nbsp;: 3 dates (D1 = 15 mai, D2&nbsp;= 01 juin et D3 = 15 juin et diff\u00e9rentes hauteurs (cf sch\u00e9ma ci dessous).<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"198\" height=\"127\" src=\"https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/10\/hauteur-ecimage-vulpin.png?resize=198%2C127&#038;ssl=1\" alt=\"hauteur \u00e9cimage vulpin\" class=\"wp-image-2907\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-justify\">On observe une augmentation du nombre de graines \u00e9cim\u00e9es (H1 et H2) avec le d\u00e9calage de la date d\u2019\u00e9cimage (cf graphique ci dessous gauche). Par contre, au mieux 70% des graines sont \u00e9cim\u00e9es lors du passage le plus tardif. Toutefois, plus on \u00e9cime tard, plus le nombre de graines viables tombant au sol augmente (cf graphique ci dessous droit).<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"739\" height=\"255\" src=\"https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/10\/essai-ecimage-vulpins.png?resize=739%2C255&#038;ssl=1\" alt=\"essai ecimage vulpins\" class=\"wp-image-2908\" srcset=\"https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/10\/essai-ecimage-vulpins.png?w=739&amp;ssl=1 739w, https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/10\/essai-ecimage-vulpins.png?resize=300%2C104&amp;ssl=1 300w\" sizes=\"(max-width: 739px) 100vw, 739px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-justify\">L\u2019optimum semble donc une date au 01 juin qui permet une efficacit\u00e9 de 60% et une viabilit\u00e9 des graines inf\u00e9rieure \u00e0 10&nbsp;%. Il est \u00e9galement possible d\u2019utiliser une \u00e9cimeuse r\u00e9cup\u00e9ratrice qui \u00e9vite que les graines de vulpin ne tombent au sol.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Succession de plusieurs cultures de printemps combin\u00e9e \u00e0 des leviers de travail du sol<\/strong><\/h4>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"549\" height=\"167\" src=\"https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/10\/succession-deux-cultures-printemps-pour-gerer-vulpin-1.png?resize=549%2C167&#038;ssl=1\" alt=\"succession deux cultures printemps pour gerer vulp\" class=\"wp-image-2910\" srcset=\"https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/10\/succession-deux-cultures-printemps-pour-gerer-vulpin-1.png?w=549&amp;ssl=1 549w, https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/10\/succession-deux-cultures-printemps-pour-gerer-vulpin-1.png?resize=300%2C91&amp;ssl=1 300w\" sizes=\"(max-width: 549px) 100vw, 549px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-justify\">Cet exemple combinant 4 cultures de printemps entre deux bl\u00e9s et un labour en 6 ans a permis \u00e0 l\u2019agriculteur de g\u00e9rer son infestation de vulpin qui entra\u00eenait jusqu\u2019\u00e0 20 q\/ha de perte de rendement du bl\u00e9.<\/p>\n\n\n\n<p><\/p>\n\n\n<div class=\"_3d-flip-book  fb3d-fullscreen-mode full-size\" data-id=\"2897\" 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 = 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&& FB3D_CLIENT_LOCALE.render && FB3D_CLIENT_LOCALE.render();<\/script>\n\n\n\n<p><\/p>\n\n\n\n<p>Pour en savoir plus sur la gestion agronomique des adventices gramin\u00e9es, vous pouvez consulter le t\u00e9moignage de Vincent FAGGIANELLI, agronome au Cerfrance Normandie Ouest sur la gestion des ray grass r\u00e9sistants : <a href=\"https:\/\/normandiemaine.cerfrance.fr\/arad2\/leviers-agronomiques-ray-grass-resistants\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/normandiemaine.cerfrance.fr\/arad2\/leviers-agronomiques-ray-grass-resistants\/<\/a><\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Source<\/h2>\n\n\n\n<p class=\"has-text-align-justify\"><em>Agrotransfert, 2023 Lutte contre le vulpin et changement climatique : adapter les strat\u00e9gies pour continuer \u00e0 le ma\u00eetriser. Webinaire du 23 mars. <\/em><a href=\"https:\/\/www.youtube.com\/watch?v=hy7opblYllM\" target=\"_blank\" rel=\"noreferrer noopener\"><em>https:\/\/www.youtube.com\/watch?v=hy7opblYllM<\/em><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Lutte contre le vulpin et changement climatique\u00a0: adapter les strat\u00e9gies pour continuer \u00e0 le ma\u00eetriser<\/p>\n","protected":false},"author":5,"featured_media":3044,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","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":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","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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