{"id":12008,"date":"2021-08-20T15:44:18","date_gmt":"2021-08-20T15:44:18","guid":{"rendered":"https:\/\/www.africa-press.net\/cotedivoire\/?p=12008"},"modified":"2021-08-20T20:17:08","modified_gmt":"2021-08-20T20:17:08","slug":"cote-divoire-region-du-poro-la-production-de-riz-menacee-par-la-pyriculariose-le-cnra-propose-la-culture-des-varietes-pluviales-strictes-cram1-cram2-cram3-et-cram4","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/cotedivoire\/economie\/cote-divoire-region-du-poro-la-production-de-riz-menacee-par-la-pyriculariose-le-cnra-propose-la-culture-des-varietes-pluviales-strictes-cram1-cram2-cram3-et-cram4","title":{"rendered":"R\u00e9gion du Poro, la production de riz menac\u00e9e par la pyriculariose, le CNRA propose la culture des vari\u00e9t\u00e9s pluviales strictes CRAM1, CRAM2, CRAM3 et CRAM4"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong><a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a> &#8211; <a href=\"https:\/\/www.africa-press.net\/cotedivoire\">C\u00f4te d&rsquo;Ivoire<\/a>. <\/strong><\/span>la pyriculariose a \u00e9t\u00e9 \u00e0 l\u2019origine de grandes pertes de production depuis des ann\u00e9es 1970 au d\u00e9but des ann\u00e9es 2000 (Vales, 1983 ; Awoderu, 1990 ; Bouet et al., 2006 ; Bouet, 2008).<\/p>\n<p>Depuis une quinzaine d\u2019ann\u00e9es, la maladie est demeur\u00e9e discr\u00e8te pour plusieurs raisons parmi lesquelles, l\u2019application des recommandations de la recherche par certains producteurs et la perte du mat\u00e9riel v\u00e9g\u00e9tal sensible du fait de la crise militaro-politique survenue de 2002 \u00e0 2010, notamment dans la zone ouest de la C\u00f4te d\u2019Ivoire.<\/p>\n<p>La pyriculariose \u00e9tait end\u00e9mique dans cette zone o\u00f9 divers cultivars traditionnels sensibles \u00e0 la pyriculariose \u00e9taient cultiv\u00e9s.<\/p>\n<p>Cette maladie menace actuellement la r\u00e9gion du Poro, l\u2019un des grands greniers rizicoles de la C\u00f4te d\u2019Ivoire. Dans le cadre du Rice Blast Project1, (projet port\u00e9 sur la pyriculariose du riz), une prospection phytosanitaire a \u00e9t\u00e9 r\u00e9alis\u00e9e dans la r\u00e9gion du Poro, pr\u00e9cis\u00e9ment \u00e0 Korhogo du 09 au 11 octobre 2019.<\/p>\n<p>Il y a \u00e9t\u00e9 not\u00e9 une forte pression de la pyriculariose du cou sur le cultivar local appel\u00e9 IGUAPE \u00ab Blanc \u00bb, dans les localit\u00e9s de Koni\u00e9, Nahoualakaha, Kafonon, Katoumoro, Lapkolo, Sambalakaha et Nibolikaha.<\/p>\n<p>Ce cultivar tr\u00e8s sensible \u00e0 la pyriculariose est cultiv\u00e9 sur de grandes superficies (0,5 \u00e0 plus d\u2019un hectare) par les autochtones, en condition pluviale stricte.<\/p>\n<p>Les incidences \u00e9valu\u00e9es de la maladie varient de 10 \u00e0 50% de cous attaqu\u00e9s. Ces ratios pr\u00e9sagent des pertes de production d\u2019ampleurs \u00e9quivalentes.<\/p>\n<p>Au regard de ces niveaux d\u2019incidence et de la s\u00e9v\u00e9rit\u00e9 de la pyriculariose sur le cultivar IGUAPE \u00ab Blanc \u00bb, largement cultiv\u00e9 dans le d\u00e9partement de Korhogo, la menace de la s\u00e9curit\u00e9 alimentaire est r\u00e9elle dans la r\u00e9gion du Poro voire en C\u00f4te d\u2019Ivoire.<\/p>\n<p>En effet, selon les statistiques rizicoles publi\u00e9es par l\u2019Agence pour le D\u00e9veloppement de la fili\u00e8re Riz (ADERIZ) en 2016, la r\u00e9gion du Poro est parmi les principales zones de culture, de production et de consommation du riz de C\u00f4te d\u2019Ivoire.<\/p>\n<p>En effet, en 2016, le riz y \u00e9tait emblav\u00e9 sur 169 431 ha, soit 19% des superficies rizicoles pour une production chiffr\u00e9e \u00e0 321 277 t de paddy repr\u00e9sentant 15% de la moisson nationale (ADERIZ, 2016).<\/p>\n<p>La menace que constitue actuellement la pyriculariose dans le Poro peut \u00eatre annihil\u00e9e si des actions d\u2019att\u00e9nuation et curatives sont conduites. En effet il existe un arsenal de moyens de lutte efficace contre M. grisea.<\/p>\n<p>Mais dans l\u2019urgence, l\u2019option de lutte appropri\u00e9e et \u00e0 la port\u00e9e financi\u00e8re des producteurs est l\u2019utilisation de vari\u00e9t\u00e9s am\u00e9lior\u00e9es de riz tol\u00e9rantes \u00e0 la maladie, en remplacement du cultivar local sensible IGUAPE \u00ab Blanc \u00bb.<\/p>\n<p>Pour des raisons pratiques et du souci de durabilit\u00e9 de la lutte, les vari\u00e9t\u00e9s de riz \u00e0 recommander sont celles en diffusion dans la r\u00e9gion, dans le cadre du projet du Fonds Comp\u00e9titif pour l\u2019Innovation Agricole Durable (FCIAD) et pilot\u00e9 par le Centre National de Recherche Agronomique (CNRA).<\/p>\n<p>Il s\u2019agit pr\u00e9cis\u00e9ment des vari\u00e9t\u00e9s de riz pluvial strict CRAM1, CRAM2, CRAM3 et CRAM4 qui sont indemnes de la pyriculariose partout o\u00f9 la maladie a \u00e9t\u00e9 observ\u00e9e sur le cultivar IGUAPE Blanc.<\/p>\n<p>Dans les localit\u00e9s \u00e9pid\u00e9miques, l\u2019adoption de la vari\u00e9t\u00e9 CRAM r\u00e9soudra deux contraintes majeures, \u00e0 savoir les pertes de r\u00e9colte induites par la pyriculariose puis l\u2019irr\u00e9gularit\u00e9 et l\u2019insuffisance de pluie dues au changement climatique.<\/p>\n<p>Notons que la menace de s\u00e9curit\u00e9 alimentaire que repr\u00e9sente la pyriculariose dans la r\u00e9gion du Poro, peut \u00eatre \u00e9vit\u00e9e si au moins l\u2019une des vari\u00e9t\u00e9s am\u00e9lior\u00e9es CRAM (CRAM1, CRAM2, CRAM3, CRAM4) est rapidement adopt\u00e9e par les producteurs, en remplacement du cultivar populaire IGUAPE Blanc.<\/p>\n<p>Pour rappel, la pyriculariose est une maladie provoqu\u00e9e par un champignon connu sous deux noms \u00e0 savoir, Pyricularia oryzae pour sa forme asexu\u00e9e et Magnaporthe grisea pour la forme sexu\u00e9e.<\/p>\n<p>Cette maladie attaque \u00e0 la fois les feuilles et le \u00ab cou \u00bb du riz. Le \u00ab cou \u00bb du riz \u00e9tant constitu\u00e9 par le dernier entren\u0153ud avant la panicule. La maladie est qualifi\u00e9e de pyriculariose foliaire lorsque la feuille est la cible et de pyriculariose du cou quand le cou est attaqu\u00e9.<\/p>\n<p>Sous ces deux manifestations, la pyriculariose induit des pertes de r\u00e9colte plus ou moins importantes selon, le niveau de sensibilit\u00e9 de la vari\u00e9t\u00e9 de riz cultiv\u00e9e et la virulence de l\u2019agent pathog\u00e8ne (Bouet et al., 2002 ; Bouet et al., 2005).<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. la pyriculariose a \u00e9t\u00e9 \u00e0 l\u2019origine de grandes pertes de production depuis des ann\u00e9es 1970 au d\u00e9but des ann\u00e9es 2000 (Vales, 1983 ; Awoderu, 1990 ; Bouet et al., 2006 ; Bouet, 2008). Depuis une quinzaine d\u2019ann\u00e9es, la maladie est demeur\u00e9e discr\u00e8te pour plusieurs raisons parmi lesquelles, l\u2019application des recommandations de [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":12007,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,11,10],"tags":[56,63,609,29,605,611,603,610,607,608,604,606],"class_list":["post-12008","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-economie","category-homepage-french","category-toutes-les-actualites","tag-africa-press","tag-africa-press-cote-divoire","tag-champignon","tag-cote-divoire","tag-cram-r","tag-magnaporthe-grisea","tag-maladie","tag-pyricularia-oryzae","tag-pyriculariose","tag-rice-blast-project1","tag-riz","tag-securite-alimentaire"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - 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