{"id":4176,"date":"2010-11-03T00:00:00","date_gmt":"2010-11-03T04:00:00","guid":{"rendered":"http:\/\/www.farmchemicalsinternational.com\/2010\/11\/03\/fungicide-resistance-found-in-soybean-field\/"},"modified":"2019-09-16T13:42:42","modified_gmt":"2019-09-16T17:42:42","slug":"fungicide-resistance-found-in-soybean-field","status":"publish","type":"post","link":"https:\/\/www.agribusinessglobal.com\/pt\/industry-news\/fungicide-resistance-found-in-soybean-field\/","title":{"rendered":"Resist\u00eancia a fungicidas \u00e9 encontrada em campo de soja"},"content":{"rendered":"

Pesquisas conduzidas pela Universidade de Illinois (U of I) e pela Universidade do Tennessee confirmam que o fungo que causa a mancha foliar olho de r\u00e3 (FLS) da soja, Cercospora sojina<\/em>, demonstrou resist\u00eancia aos fungicidas estrobilurina em um campo de soja no Tennessee.<\/p>\n

\u201cOs fungicidas de estrobilurina pertencem \u00e0 classe qu\u00edmica conhecida como inibidores externos de quinona (QoIs), que s\u00e3o o grupo mais amplamente utilizado de fungicidas foliares aplicados em culturas de campo para controlar doen\u00e7as de plantas\u201d, diz Carl Bradley, patologista de plantas da U of I Extension.<\/p>\n

Esses fungicidas podem ser vendidos como produtos de um ingrediente ativo, como Headline (BASF Corp.) ou Quadris (Syngenta Crop Protection) ou em produtos que os combinam com um fungicida em uma classe qu\u00edmica diferente, conhecidos como inibidores de desmetila\u00e7\u00e3o, \u00e0s vezes chamados de triaz\u00f3is, ele diz. Produtos que incluem uma combina\u00e7\u00e3o de estrobilurina-triazol de ingredientes ativos incluem Quilt (Syngenta Crop Protection) e Stratego (Bayer CropScience).<\/p>\n

Os fungicidas Strobilurin foram considerados de alto risco para pat\u00f3genos f\u00fangicos desenvolverem resist\u00eancia a eles. Esse status de alto risco foi determinado pelo Fungicide Resistance Action Committee (FRAC), um comit\u00ea internacional que avalia a probabilidade de fungicidas desenvolverem resist\u00eancia.<\/p>\n

\u201cFungos patog\u00eanicos de plantas desenvolvendo resist\u00eancia a fungicidas de estrobilurina n\u00e3o s\u00e3o novidade\u201d, diz Bradley. \u201cIsso j\u00e1 ocorreu em batatas e outros sistemas de cultivo e doen\u00e7as onde m\u00faltiplas aplica\u00e7\u00f5es de fungicidas ocorrem durante a esta\u00e7\u00e3o de crescimento.\u201d<\/p>\n

Nas principais \u00e1reas de produ\u00e7\u00e3o de soja nos EUA, os campos de soja geralmente s\u00e3o tratados uma vez por temporada com um fungicida (se forem tratados), diz Bradley.<\/p>\n

\u201cNo entanto, ficamos um tanto surpresos ao encontrar resist\u00eancia t\u00e3o cedo\u201d, ele acrescenta. \u201cToda vez que voc\u00ea aplica um fungicida, voc\u00ea aumenta a press\u00e3o de sele\u00e7\u00e3o e a oportunidade de selecionar indiv\u00edduos na popula\u00e7\u00e3o de pat\u00f3genos que t\u00eam resist\u00eancia ou sensibilidade reduzida ao fungicida.\u201d<\/p>\n

Em 2008, o laborat\u00f3rio de Bradley iniciou um projeto financiado pela Illinois Soybean Association para desenvolver um programa de monitoramento de resist\u00eancia a fungicidas. Desde ent\u00e3o, seu laborat\u00f3rio vem obtendo amostras, conduzindo testes e monitorando isolados coletados de Illinois.<\/p>\n

\u201cEste ano, decidimos lan\u00e7ar nossa rede um pouco mais longe, particularmente no Sul\u201d, ele diz. \u201cNo Tennessee, a FLS \u00e9 uma grande doen\u00e7a foliar da soja. O Dr. Melvin Newman da Universidade do Tennessee me enviou amostras de um campo que havia sido pulverizado duas vezes com fungicidas de estrobilurina, mas ainda continuava a ter altos n\u00edveis de FLS, o que era uma indica\u00e7\u00e3o de potencial resist\u00eancia a fungicidas.\u201d<\/p>\n

A equipe de Bradley confirmou que a sensibilidade dos isolados do Tennessee foi reduzida em compara\u00e7\u00e3o \u00e0 sensibilidade dos isolados de base.<\/p>\n

Em testes de placa de Petri conduzidos na Universidade de Illinois, esporos de isolados de Cercospora sojina<\/em> germinado na presen\u00e7a de altas concentra\u00e7\u00f5es de azoxistrobina, piraclostrobina e trifloxistrobina, que s\u00e3o os ingredientes ativos da estrobilurina encontrados em Quadris, Headline e Stratego.<\/p>\n

\u201cIsso provou que est\u00e1vamos lidando com isolados que t\u00eam sensibilidade reduzida aos fungicidas de estrobilurina\u201d, ele disse. \u201cAtualmente, o Tennessee \u00e9 o \u00fanico estado em que documentamos isolados como esses, mas continuamos a realizar testes em isolados coletados de campos em Illinois e outros estados.\u201d<\/p>\n

(Fonte: Jennifer Shike, Faculdade de Ci\u00eancias Agr\u00e1rias, do Consumidor e Ambientais, Universidade de Illinois)<\/em><\/p>","protected":false},"excerpt":{"rendered":"

Pesquisas conduzidas pela Universidade de Illinois (U of I) e pela Universidade do Tennessee confirmam que o fungo que\u2026<\/p>","protected":false},"author":110,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[489],"tags":[],"class_list":["post-4176","post","type-post","status-publish","format-standard","hentry","category-industry-news"],"yoast_head":"\nFungicide Resistance Found in Soybean Field - AgriBusiness Global<\/title>\n<meta name=\"description\" content=\"Research conducted by the University of Illinois (U of I) and the University of Tennessee confirms that the fungus that causes frogeye leaf spot (FLS) of\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.agribusinessglobal.com\/pt\/industry-news\/fungicide-resistance-found-in-soybean-field\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Fungicide Resistance Found in Soybean Field - 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