{"id":4586,"date":"2025-07-09T11:42:29","date_gmt":"2025-07-09T14:42:29","guid":{"rendered":"https:\/\/portalmaisagro.com\/?p=4586"},"modified":"2025-07-09T11:43:43","modified_gmt":"2025-07-09T14:43:43","slug":"embrapa-identifica-primeiro-caso-de-vassoura-de-bruxa-da-mandioca-no-brasil","status":"publish","type":"post","link":"https:\/\/portalmaisagro.com\/?p=4586","title":{"rendered":"Embrapa identifica primeiro caso de \u201cvassoura de bruxa\u201d da mandioca no Brasil"},"content":{"rendered":"<p style=\"text-align: justify\"><em>A doen\u00e7a \u00e9 causada por um fungo de ocorr\u00eancia in\u00e9dita no Pa\u00eds<\/em><\/p>\n<p style=\"text-align: justify\"><span style=\"font-weight: 400\">A partir de an\u00e1lises biol\u00f3gicas e moleculares, a Embrapa Amap\u00e1 e a Embrapa Mandioca e Fruticultura confirmaram ao Minist\u00e9rio da Agricultura e Pecu\u00e1ria (Mapa) o primeiro relato da presen\u00e7a do fungo\u00a0<\/span><i><span style=\"font-weight: 400\">Ceratobasidium theobromae (Rhizoctonia theobromae)\u00a0<\/span><\/i><span style=\"font-weight: 400\">no Brasil, causador da doen\u00e7a \u201cvassoura de bruxa\u201d da mandioca.\u00a0O pat\u00f3geno foi confirmado por laudo do Mapa, por meio de an\u00e1lise de identifica\u00e7\u00e3o da esp\u00e9cie realizada por equipe deste Minist\u00e9rio.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/p>\n<p style=\"text-align: justify\"><span style=\"font-weight: 400\">A doen\u00e7a foi constatada nos plantios de mandioca das terras ind\u00edgenas de Oiapoque, munic\u00edpio do estado do Amap\u00e1, localizado na fronteira do Brasil com a Guiana Francesa.\u00a0A presen\u00e7a de\u00a0<\/span><i><span style=\"font-weight: 400\">Ceratobasidium theobromae<\/span><\/i><span style=\"font-weight: 400\">\u00a0representa risco de significativa redu\u00e7\u00e3o na produtividade das plantas de mandioca afetadas, tamb\u00e9m atinge o cacaueiro e tem potencial para infestar cupua\u00e7uzeiros.\u00a0<\/span><\/p>\n<p style=\"text-align: justify\"><span style=\"font-weight: 400\">A &#8220;vassoura de bruxa&#8221; tem este nome porque deixa os ramos das plantas secos e deformados incluindo nanismo e prolifera\u00e7\u00e3o de brotos fracos e finos nos caules, parecidos com uma vassoura velha.\u00a0Com a evolu\u00e7\u00e3o da doen\u00e7a \u00e9 comum a ocorr\u00eancia de clorose, murcha e seca das folhas, morte apical e morte descendente das plantas.<\/span><\/p>\n<p style=\"text-align: justify\"><span style=\"font-weight: 400\">A dispers\u00e3o de\u00a0<\/span><i><span style=\"font-weight: 400\">Ceratobasidium theobromae\u00a0<\/span><\/i><span style=\"font-weight: 400\">pode ocorrer por meio de material vegetal infectado, ferramentas de corte, al\u00e9m de poss\u00edvel movimenta\u00e7\u00e3o de solo e \u00e1gua. \u201cA movimenta\u00e7\u00e3o de plantas e produtos agr\u00edcolas entre regi\u00f5es pode facilitar a dispers\u00e3o do pat\u00f3geno, aumentando o risco de infec\u00e7\u00e3o em novas \u00e1reas\u201d, alerta a Nota T\u00e9cnica da Embrapa.<\/span><\/p>\n<p style=\"text-align: justify\"><span style=\"font-weight: 400\">Pesquisadores do Centro Franc\u00eas de Pesquisa Agr\u00edcola para o Desenvolvimento Internacional (CIRAD\/Fran\u00e7a), em parceria com o Centro Internacional de Agricultura Tropical (CIAT\/Col\u00f4mbia), coletaram e isolaram\u00a0<\/span><i><span style=\"font-weight: 400\">Ceratobasidium theobromae<\/span><\/i><span style=\"font-weight: 400\">\u00a0em \u00e1reas afetadas com sinais similares na Guiana Francesa, pr\u00f3ximas \u00e0 fronteira com o Brasil e o Suriname.<\/span><\/p>\n<p style=\"text-align: justify\"><span style=\"font-weight: 400\">A Embrapa destaca tamb\u00e9m que a detec\u00e7\u00e3o de\u00a0<\/span><i><span style=\"font-weight: 400\">Ceratobasidium theobromae<\/span><\/i><span style=\"font-weight: 400\">\u00a0no Brasil requer coopera\u00e7\u00e3o imediata entre agentes de assist\u00eancia t\u00e9cnica, \u00f3rg\u00e3os de defesa vegetal estaduais, pesquisadores, agricultores e autoridades governamentais, \u00a0como uma pr\u00e1tica fundamental para implementar medidas efetivas de conten\u00e7\u00e3o, manejo e controle, a fim de garantir a seguran\u00e7a e sustentabilidade da produ\u00e7\u00e3o agr\u00edcola. A descoberta da Embrapa pode contribuir com o avan\u00e7o cient\u00edfico das pesquisas relacionadas para o melhoramento gen\u00e9tico da mandioca e recomenda\u00e7\u00e3o de medidas para o controle da doen\u00e7a.\u00a0<\/span><\/p>\n<p style=\"text-align: justify\"><b>Recomenda\u00e7\u00f5es para diminuir o impacto<\/b><\/p>\n<p style=\"text-align: justify\"><span style=\"font-weight: 400\">Para diminuir os impactos da nova doen\u00e7a, a Embrapa recomenda estrat\u00e9gias que v\u00e3o desde o protocolo de detec\u00e7\u00e3o precoce do pat\u00f3geno, uso de manivas de comprovada sanidade, boas pr\u00e1ticas agr\u00edcolas, entre outras, envolvendo os diversos agentes que atuam nas respectivas recomenda\u00e7\u00f5es:<\/span><\/p>\n<p style=\"text-align: justify\">1.Monitoramento e vigil\u00e2ncia: intensifica\u00e7\u00e3o do monitoramento das \u00e1reas de cultivo para identifica\u00e7\u00e3o precoce de sintomas.<\/p>\n<p style=\"text-align: justify\"><span style=\"font-weight: 400\">1.1. Estabelecer protocolo de detec\u00e7\u00e3o precoce do pat\u00f3geno via PCR e\/ou via sequenciamento por HTS em suporte \u00e0s a\u00e7\u00f5es de monitoramento e vigil\u00e2ncia<\/span><\/p>\n<p style=\"text-align: justify\"><span style=\"font-weight: 400\">1.2. Acreditar laborat\u00f3rios para a realiza\u00e7\u00e3o do diagn\u00f3stico e indexa\u00e7\u00e3o para pat\u00f3genos de import\u00e2ncia para a cultura<\/span><\/p>\n<ol style=\"text-align: justify\" start=\"2\">\n<li><span style=\"font-weight: 400\"> Quarentena: implementa\u00e7\u00e3o de medidas de quarentena para restringir a movimenta\u00e7\u00e3o de material vegetal de \u00e1reas afetadas.<\/span><\/li>\n<li><span style=\"font-weight: 400\"> Manivas sadias: uso de manivas com comprovada sanidade, e produzidas em regi\u00f5es sem a doen\u00e7a, ou em condi\u00e7\u00f5es que n\u00e3o permitam o desenvolvimento do pat\u00f3geno (ex. c\u00e2maras t\u00e9rmicas, viveiros e estufas).<\/span><\/li>\n<li><span style=\"font-weight: 400\"> Tratamento qu\u00edmico: uso de fungicidas espec\u00edficos para controlar a dispers\u00e3o do pat\u00f3geno, conforme regulamenta\u00e7\u00f5es locais.<\/span><\/li>\n<li><span style=\"font-weight: 400\"> Pr\u00e1ticas culturais: remo\u00e7\u00e3o e elimina\u00e7\u00e3o por queima de plantas doentes como forma de reduzir o in\u00f3culo nas \u00e1reas afetadas e diminuir a incid\u00eancia de novas plantas infectadas.<\/span><\/li>\n<li><span style=\"font-weight: 400\"> Assepsia\/sanitiza\u00e7\u00e3o de ferramentas utilizadas para a destrui\u00e7\u00e3o das plantas com sinais da doen\u00e7a. Lavagem com \u00e1gua e detergente e em seguida a sanitiza\u00e7\u00e3o com solu\u00e7\u00e3o de hipoclorito de s\u00f3dio a 1,25%.<\/span><\/li>\n<li><span style=\"font-weight: 400\"> Realizar o ensacamento e r\u00e1pida lavagem de roupas, cal\u00e7ados e chap\u00e9us e ou bon\u00e9s utilizados nas visitas em \u00e1reas afetadas pela doen\u00e7a, de forma a evitar a dissemina\u00e7\u00e3o de esporos para outras regi\u00f5es do pa\u00eds.<\/span><\/li>\n<li><span style=\"font-weight: 400\"> Elaborar publica\u00e7\u00f5es, v\u00eddeos e cartazes para o esclarecimento do p\u00fablico em geral sobre os sinais e modos de transmiss\u00e3o da doen\u00e7a.<\/span><\/li>\n<\/ol>\n<p style=\"text-align: justify\"><b>Hist\u00f3rico de coleta do material infectado<\/b><\/p>\n<p style=\"text-align: justify\"><span style=\"font-weight: 400\">Em mar\u00e7o de 2023, uma equipe da Embrapa Amap\u00e1 participou da 29\u00aa Assembleia de Avalia\u00e7\u00e3o e Planejamento dos Povos e Organiza\u00e7\u00f5es Ind\u00edgenas do Munic\u00edpio de Oiapoque (APIO), evento realizado pelo Conselho dos Caciques dos Povos Ind\u00edgenas do Oiapoque (CCPIO). A institui\u00e7\u00e3o de pesquisa foi demandada para avaliar e realizar a\u00e7\u00f5es, dentro das suas atribui\u00e7\u00f5es, visando amenizar a ocorr\u00eancia de doen\u00e7as que atingem os plantios de mandioca.\u00a0 Na semana seguinte, uma equipe\u00a0constatou<\/span><i><span style=\"font-weight: 400\">\u00a0in loco<\/span><\/i><span style=\"font-weight: 400\">\u00a0os sinais compat\u00edveis com a doen\u00e7a \u2018vassoura de bruxa\u2019 da mandioca nas aldeias ind\u00edgenas Ahum\u00e3m, Anawer\u00e1, Tuluhi e Tukay.<\/span><\/p>\n<p style=\"text-align: justify\"><span style=\"font-weight: 400\">Posteriormente, os mesmos sinais foram detectados nas aldeias Kuah\u00ed, Ywawk\u00e1, Karibuen, Kuai Kuai, Ariramba, Galibi, Len\u00e7ol, Manga, Zacarias e Japiim. De acordo com a Nota T\u00e9cnica da Embrapa Amap\u00e1, por ocasi\u00e3o da detec\u00e7\u00e3o dos primeiros sinais da doen\u00e7a, hastes de mandioca infectadas foram transportadas para o laborat\u00f3rio de Prote\u00e7\u00e3o de Plantas da Embrapa Amap\u00e1, visando o isolamento do prov\u00e1vel agente etiol\u00f3gico da doen\u00e7a em condi\u00e7\u00f5es de laborat\u00f3rio.<\/span><\/p>\n<p style=\"text-align: justify\"><b>An\u00e1lise molecular do fungo<\/b><\/p>\n<p style=\"text-align: justify\"><span style=\"font-weight: 400\">Com a evolu\u00e7\u00e3o dos sinais de doen\u00e7as nas ro\u00e7as dos ind\u00edgenas do Oiapoque, novas amostras de plantas infectadas foram analisadas no Laborat\u00f3rio de Fitopatologia da Embrapa Mandioca e Fruticultura (Bahia), visando realizar a diagnose molecular do agente causal deste novo surto epid\u00eamico no estado do Amap\u00e1. \u00a0<\/span><\/p>\n<p style=\"text-align: justify\"><span style=\"font-weight: 400\">As amostras foram ent\u00e3o liofilizadas e preservadas em -80\u00b0C para as an\u00e1lises de sequenciamento profundo (Deep sequencing) em sequenciadores de alta performance (High-Throughput Sequencing) em plataformas Illumina e Nanopore, em parceria com a Cole\u00e7\u00e3o Alem\u00e3 de Microrganismos e Culturas Celulares (Deutsche Sammlung von Mikroorganismen und Zellkulturen -DSMZ), na Alemanha.<\/span><\/p>\n<p style=\"text-align: justify\"><span style=\"font-weight: 400\">Em seguida, foi feito o sequenciamento de amostras conjuntas (pools) com base nos diferentes tecidos coletados (folhas, pec\u00edolos e hastes), e a compara\u00e7\u00e3o entre os pat\u00f3genos com maior concord\u00e2ncia entre estes, presen\u00e7a de pat\u00f3genos end\u00eamicos e de import\u00e2ncia para a cultura, bem como de potenciais pat\u00f3genos n\u00e3o relatados no Brasil.<\/span><\/p>\n<p style=\"text-align: justify\"><span style=\"font-weight: 400\">Um conjunto grande de pat\u00f3genos e organismos endof\u00edticos foi detectado pela t\u00e9cnica empregada e que est\u00e3o associados \u00e0 cultura, mas nunca relatados associados aos sinais observados\u00a0<\/span><i><span style=\"font-weight: 400\">in loco<\/span><\/i><span style=\"font-weight: 400\">, exceto para o\u00a0<\/span><i><span style=\"font-weight: 400\">Ceratobasidium theobromae (Rhizoctonia theobromae<\/span><\/i><span style=\"font-weight: 400\">), um fungo nunca antes relatado no continente Americano.<\/span><\/p>\n<p><strong>Dulciv\u00e2nia Freitas (DRT-PB 1.063\/96)<\/strong><br \/>\n<strong>Embrapa Amap\u00e1<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A doen\u00e7a \u00e9 causada por um fungo de ocorr\u00eancia in\u00e9dita no Pa\u00eds A partir de an\u00e1lises biol\u00f3gicas e moleculares, a Embrapa Amap\u00e1 e a Embrapa Mandioca e Fruticultura confirmaram ao Minist\u00e9rio da Agricultura e Pecu\u00e1ria (Mapa) o primeiro relato da presen\u00e7a do fungo\u00a0Ceratobasidium theobromae (Rhizoctonia theobromae)\u00a0no Brasil, causador da doen\u00e7a&hellip;<\/p>\n","protected":false},"author":10,"featured_media":4587,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[136],"tags":[],"class_list":["post-4586","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-embrapa"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - 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