{"id":35801,"date":"2013-03-28T19:31:23","date_gmt":"2013-03-28T17:31:23","guid":{"rendered":"http:\/\/staging.sillon38.com\/?p=35801"},"modified":"2013-03-28T19:31:23","modified_gmt":"2013-03-28T17:31:23","slug":"la-pepiniere-et-les-champignons-des-maladies-du-bois","status":"publish","type":"post","link":"https:\/\/www.sillon38.com\/blog\/2013\/03\/28\/la-pepiniere-et-les-champignons-des-maladies-du-bois\/","title":{"rendered":"La p\u00e9pini\u00e8re et les champignons des maladies du bois"},"content":{"rendered":"<p><span style=\"color: #333399;\"><strong>La technique de greffage en vert permet d\u2019obtenir des plants dans lesquels aucun champignon des maladies du bois n\u2019a pu \u00eatre d\u00e9tect\u00e9.<\/strong><\/span><\/p>\n<p><span style=\"color: #333399;\"> C\u2019est le principal r\u00e9sultat d\u2019une \u00e9tude IFV effectu\u00e9e pendant deux ann\u00e9es cons\u00e9cutives (2010, 2011) qui a port\u00e9 sur l\u2019analyse microbiologique de greffes-boutures herbac\u00e9es \u00e9lev\u00e9es en serre. Ces plantes \u00e9taient produites \u00e0 partir de vignes-m\u00e8res de porte-greffes et de vignes-m\u00e8res de greffons cultiv\u00e9es en serre, par cons\u00e9quent non soumises, aux contaminations observ\u00e9es dans le vignoble.<\/span><\/p>\n<p><span style=\"color: #333399;\"> <\/span><\/p>\n<p><span style=\"color: #333399;\">Bien que le transfert de cette technique aux conditions r\u00e9elles de production reste probablement d\u00e9licat, la disponibilit\u00e9 d\u2019une telle m\u00e9thode de production appara\u00eet tr\u00e8s int\u00e9ressante dans un cadre plus g\u00e9n\u00e9ral de recherche sur les maladies du bois.<\/span><\/p>\n<p><span style=\"color: #333399;\"> Elle rend possible en effet la mise en place et le suivi dans le temps de parcelles issues de mat\u00e9riel v\u00e9g\u00e9tal sain, implant\u00e9es dans diff\u00e9rents environnements (vignoble, autre), dans le but de mieux conna\u00eetre le r\u00f4le des jeunes plants dans l\u2019\u00e9pid\u00e9miologie de la maladie. <\/span><\/p>\n<p><span style=\"color: #333399;\">Un tel dispositif permettrait ainsi de mesurer la vitesse \u00e0 laquelle une jeune parcelle est contamin\u00e9e par les champignons associ\u00e9s aux maladies du bois. En effet, \u00e0 ce jour, personne ne peut affirmer que des plants infect\u00e9s en sortie de p\u00e9pini\u00e8re manifestent plus rapidement des sympt\u00f4mes des maladies du bois que des plants exempts de champignons pathog\u00e8nes. <\/span><\/p>\n<p><span style=\"color: #333399;\">A rappeler que les premiers sympt\u00f4mes foliaires apparaissent le plus souvent au minimum sept ou huit ann\u00e9es apr\u00e8s la plantation.<\/span><\/p>\n<p><span style=\"color: #333399;\"> <\/span><\/p>\n<p><span style=\"color: #ff6600;\"> <\/span><\/p>\n<figure id=\"attachment_35802\" aria-describedby=\"caption-attachment-35802\" style=\"width: 597px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-35802\" title=\"vigne 3\" src=\"http:\/\/staging.sillon38.com\/wp-content\/uploads\/2013\/03\/vigne-3-1.png\" alt=\"Porte-greffes sous serre herbac\u00e9e (P. Bloy)                 \" width=\"597\" height=\"461\" srcset=\"https:\/\/www.sillon38.com\/blog\/wp-content\/uploads\/2013\/03\/vigne-3-1.png 597w, https:\/\/www.sillon38.com\/blog\/wp-content\/uploads\/2013\/03\/vigne-3-1-300x232.png 300w\" sizes=\"auto, (max-width: 597px) 100vw, 597px\" \/><figcaption id=\"caption-attachment-35802\" class=\"wp-caption-text\">Porte-greffes sous serre herbac\u00e9e (P. Bloy)                 <\/figcaption><\/figure>\n<p><span style=\"color: #ff6600;\"><strong>De nombreux travaux d\u00e9j\u00e0 effectu\u00e9s par l\u2019IFV<\/strong><\/span><\/p>\n<p><span style=\"color: #333399;\"> <\/span><\/p>\n<p><span style=\"color: #333399;\">Cette \u00e9tude financ\u00e9e par le Minist\u00e8re de l\u2019Agriculture, de\u00a0 l\u2019Agroalimentaire et de la For\u00eat dans le cadre de l\u2019appel \u00e0 projets CASDAR (2010 \u2013 2012), fait suite \u00e0 de nombreux travaux d\u00e9j\u00e0 \u00a0effectu\u00e9s par l\u2019IFV en collaboration avec les p\u00e9pini\u00e9ristes et les Chambres d\u2019agriculture. <\/span><\/p>\n<p><span style=\"color: #333399;\">Ces travaux, financ\u00e9s par FranceAgriMer et par les r\u00e9gions PACA et Midi-Pyr\u00e9n\u00e9es, avaient permis de mettre en \u00e9vidence la pr\u00e9sence des champignons dans le mat\u00e9riel v\u00e9g\u00e9tal, d\u2019identifier leurs sources d\u2019inoculum (surface du mat\u00e9riel v\u00e9g\u00e9tal), et de d\u00e9finir les \u00e9tapes-cl\u00e9s de contamination des plants au cours de leur \u00e9laboration, \u00e0 savoir la stratification et l\u2019\u00e9levage au champ. <\/span><\/p>\n<p><span style=\"color: #333399;\">La premi\u00e8re \u00e9tape se d\u00e9roule dans des conditions tr\u00e8s humides et \u00e0 des temp\u00e9ratures chaudes (de l\u2019ordre de 28\u00b0C), conditions n\u00e9cessaires pour la callog\u00e9n\u00e8se mais \u00e9galement favorables au d\u00e9veloppement de ces champignons. Ceux-ci colonisent non seulement les greffes-boutures en surface mais \u00e9galement y p\u00e9n\u00e8trent par les plaies effectu\u00e9es lors du greffage, du d\u00e9bitage et de l\u2019\u00e9borgnage des porte-greffes.<\/span><\/p>\n<p><span style=\"color: #333399;\"> Quant \u00e0 la deuxi\u00e8me \u00e9tape-cl\u00e9, elle pose de nombreuses questions sur l\u2019origine des contaminations observ\u00e9es. Proviennent-elles des plants ou du milieu environnant ?<\/span><\/p>\n<p><span style=\"color: #333399;\"> <\/span><\/p>\n<p><span style=\"color: #ff6600;\"> <strong>La notion de qualit\u00e9<\/strong><\/span><\/p>\n<p><span style=\"color: #333399;\"> <\/span><\/p>\n<p><span style=\"color: #333399;\">Ces derni\u00e8res ann\u00e9es, les recherches ont port\u00e9 sur les m\u00e9thodes de d\u00e9sinfection du mat\u00e9riel v\u00e9g\u00e9tal destin\u00e9es \u00e0 \u00e9viter les contaminations observ\u00e9es lors de la fabrication des plants. Parmi tous les traitements test\u00e9s par l\u2019IFV, aucun n\u2019a permis d\u2019am\u00e9liorer la \u00ab\u00a0qualit\u00e9\u00a0\u00bb des plants en sortie de p\u00e9pini\u00e8re. <\/span><\/p>\n<p><span style=\"color: #333399;\">La notion de qualit\u00e9 \u00e9tant d\u00e9finie dans ce cas par une absence ou une tr\u00e8s faible pr\u00e9sence des champignons li\u00e9s aux maladies du bois. Actuellement, seul le traitement \u00e0 l\u2019eau chaude* effectu\u00e9 dans les conditions de lutte contre le phytoplasme de la flavescence dor\u00e9e (50\u00b0C, 45 min) donne des r\u00e9sultats satisfaisants lorsqu\u2019il est appliqu\u00e9 sur les plants car il est efficace \u00e0 l\u2019\u00e9gard de la plupart de ces champignons.<\/span><\/p>\n<p><span style=\"color: #333399;\"> Cependant, il n\u2019est pas suffisant pour garantir leur absence totale dans les greff\u00e9s-soud\u00e9s, car certains de ces agents pathog\u00e8nes y sont insensibles. Seul le suivi de parcelles trait\u00e9es (en cours), compar\u00e9es \u00e0 des parcelles n\u2019ayant pas subi ce traitement, permettra d\u2019apporter une r\u00e9ponse d\u00e9finitive sur un \u00e9ventuel impact au vignoble, par exemple en termes de r\u00e9duction ou de retard d\u2019apparition des sympt\u00f4mes.<\/span><\/p>\n<p><span style=\"color: #333399;\"> <\/span><\/p>\n<blockquote><p><span style=\"color: #333399;\"> <em>*Le traitement \u00e0 l\u2019eau chaude pr\u00e9sente l\u2019avantage d\u2019\u00eatre performant sur d\u2019autres micro-organismes impliqu\u00e9s dans d\u2019autres maladies telles la n\u00e9crose bact\u00e9rienne, le \u00a0Bois noir, la Flavescence dor\u00e9e\u2026 <\/em><\/span><\/p><\/blockquote>\n<p><span style=\"color: #333399;\"> <strong>Philippe Larignon<\/strong>, Chef de Projet maladies du bois, IFV, P\u00f4le Rh\u00f4ne-M\u00e9diterran\u00e9e <\/span><\/p>\n<p><span style=\"color: #333399;\"><strong> Pascal Bloy, <\/strong>Responsable du P\u00f4le Mat\u00e9riel V\u00e9g\u00e9tal de l\u2019IFV<\/span><\/p>\n<p><span style=\"color: #333399;\"> <\/span><\/p>\n<figure id=\"attachment_35803\" aria-describedby=\"caption-attachment-35803\" style=\"width: 563px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-35803\" title=\"vigne31\" src=\"http:\/\/staging.sillon38.com\/wp-content\/uploads\/2013\/03\/vigne31-1.png\" alt=\"Plant en pot issu de greffe-bouture herbac\u00e9e (P. Bloy)\" width=\"563\" height=\"842\" srcset=\"https:\/\/www.sillon38.com\/blog\/wp-content\/uploads\/2013\/03\/vigne31-1.png 563w, https:\/\/www.sillon38.com\/blog\/wp-content\/uploads\/2013\/03\/vigne31-1-201x300.png 201w\" sizes=\"auto, (max-width: 563px) 100vw, 563px\" \/><figcaption id=\"caption-attachment-35803\" class=\"wp-caption-text\">Plant en pot issu de greffe-bouture herbac\u00e9e (P. Bloy)<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>La technique du greffage en vert permet d\u2019obtenir des plants d\u00e9pourvus des champignons associ\u00e9s aux maladies du bois selon une \u00e9tude men\u00e9e par l\u2019Institut Fran\u00e7ais de la Vigne et du Vin (IFV). <\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[78],"tags":[2563,2915,4266],"class_list":["post-35801","post","type-post","status-publish","format-standard","hentry","category-viticulture","tag-franceagrimer","tag-ifv","tag-philippe-larignon"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>La p\u00e9pini\u00e8re et les champignons des maladies du bois -<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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