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{"id":7105,"date":"2022-01-10T13:48:30","date_gmt":"2022-01-10T16:48:30","guid":{"rendered":"http:\/\/agribrasilis.com\/?p=7105"},"modified":"2022-03-17T14:15:53","modified_gmt":"2022-03-17T17:15:53","slug":"ferrugem-da-soja-pode-causar-ate-100-de-reducao-de-produtividade","status":"publish","type":"post","link":"https:\/\/agribrasilis.com\/2022\/01\/10\/ferrugem-da-soja-pode-causar-ate-100-de-reducao-de-produtividade\/","title":{"rendered":"Ferrugem da soja pode causar at\u00e9 100% de redu\u00e7\u00e3o de produtividade"},"content":{"rendered":"
\u201c… chuvas bem distribu\u00eddas favorecem o desenvolvimento da doen\u00e7a …\u201d<\/p>\n
<\/p>\n
Cl\u00e1udia Godoy<\/strong> \u00e9 engenheira agr\u00f4noma, doutora em Fitopatologia pela Universidade de S\u00e3o Paulo e pesquisadora da Empresa Brasileira de Pesquisa Agropecu\u00e1ria (Embrapa Soja)<\/strong>, onde atua na \u00e1rea de Fitopatologia com \u00eanfase em epidemiologia e controle de doen\u00e7as de soja.<\/p>\n
A ferrugem da soja, causada pelo fungo Phakopsora pachyrhizi<\/em>, \u00e9 a doen\u00e7a mais severa da cultura, podendo causar at\u00e9 100% de redu\u00e7\u00e3o de produtividade. O dano depende do momento em que a doen\u00e7a incide na lavoura (quanto mais cedo, maior o potencial de dano) e das condi\u00e7\u00f5es clim\u00e1ticas ap\u00f3s a incid\u00eancia. Chuvas bem distribu\u00eddas favorecem o desenvolvimento da doen\u00e7a. Apesar de ser uma doen\u00e7a severa, h\u00e1 fungicidas eficientes para o controle.<\/p>\n
Nas \u00faltimas safras, as estrat\u00e9gias de manejo adotadas t\u00eam reduzido a incid\u00eancia da doen\u00e7a e auxiliado no manejo, evitando perdas de produtividade. Entre essas estrat\u00e9gias destacam-se a ado\u00e7\u00e3o do vazio sanit\u00e1rio, que \u00e9 o per\u00edodo sem semeadura de soja na entressafra, com objetivo de reduzir a popula\u00e7\u00e3o do fungo no ambiente e atrasar a ocorr\u00eancia da doen\u00e7a na safra. Outra estrat\u00e9gia \u00e9 a concentra\u00e7\u00e3o da janela de semeadura com utiliza\u00e7\u00e3o de cultivares precoces. A utiliza\u00e7\u00e3o de cultivares precoces tem sido mais intensa nos \u00faltimos anos, principalmente em \u00e1reas que t\u00eam como objetivo o estabelecimento de culturas de sucess\u00e3o como o milho ou em menor \u00e1rea, mas ainda de forma significativa no Cerrado, o algod\u00e3o. \u00c0 medida que as semeaduras de soja se sucedem e a janela de semeadura se estende, o in\u00f3culo do fungo se multiplica nas primeiras semeaduras e em condi\u00e7\u00f5es favor\u00e1veis, a doen\u00e7a se inicia cada vez mais cedo nas lavouras semeadas mais tarde.<\/p>\n
Nas primeiras lavouras semeadas, dependendo da regi\u00e3o, tendem a predominar outras doen\u00e7as foliares como a mancha-alvo (Corynespora cassiicola<\/em>), o o\u00eddio (Erysiphe diffusa<\/em>), a mancha-parda (Septoria glycines<\/em>) e o crestamento-foliar de Cercospora<\/em> (Cercospora<\/em> spp.). Fungicidas s\u00e3o utilizados nas primeiras lavouras semeadas para controle das manchas foliares e tamb\u00e9m do mofo-branco (Sclerotinia sclerotiorum<\/em>), o que contribui no controle da ferrugem-asi\u00e1tica.<\/p>\n
Na safra 2021\/2022, as primeiras ocorr\u00eancias da ferrugem-asi\u00e1tica foram relatadas no site do Cons\u00f3rcio Antiferrugem a partir de dezembro, nos estados de S\u00e3o Paulo, Paran\u00e1 e Minas Gerais, seguindo a mesma tend\u00eancia das safras anteriores. At\u00e9 o final dezembro, a baixa frequ\u00eancia de chuvas na regi\u00e3o sul nos meses de novembro e dezembro tem prejudicado o desenvolvimento das lavouras, n\u00e3o favorecendo tamb\u00e9m a incid\u00eancia de doen\u00e7as, incluindo a ferrugem-asi\u00e1tica. J\u00e1 na regi\u00e3o centro Norte, o excesso de chuvas tem favorecido a incid\u00eancia do mofo-branco, em regi\u00f5es com in\u00f3culo do fungo.<\/p>\n
Embora a ferrugem-asi\u00e1tica seja favorecida por chuvas bem distribu\u00eddas, o excesso de chuvas pode limitar sua dissemina\u00e7\u00e3o, lavando os esporos das folhas infectadas. As condi\u00e7\u00f5es clim\u00e1ticas at\u00e9 o final de dezembro, com extremos nas duas regi\u00f5es, explicam o menor n\u00famero de relatos da doen\u00e7a em rela\u00e7\u00e3o \u00e0s safras anteriores at\u00e9 o final de dezembro. Por\u00e9m, h\u00e1 necessidade de maior cuidado com as lavouras ainda em desenvolvimento, principalmente nas regi\u00f5es onde as chuvas est\u00e3o mais regulares e as aplica\u00e7\u00f5es de fungicidas est\u00e3o sendo comprometidas pelas condi\u00e7\u00f5es clim\u00e1ticas.<\/p>\n
Sintomas t\u00edpicos de amarelecimento das folhas<\/strong><\/p><\/div>\n
Folha de soja com ferrugem asi\u00e1tica<\/strong><\/p><\/div>\n","protected":false},"excerpt":{"rendered":"
\u201c… chuvas bem distribu\u00eddas favorecem o desenvolvimento da doen\u00e7a …\u201d<\/p>\n","protected":false},"author":4,"featured_media":7106,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[57],"tags":[33],"acf":[],"yoast_head":"\n
Ferrugem da soja pode causar at\u00e9 100% de redu\u00e7\u00e3o de produtividade - Agribrasilis - Inside Agribusiness<\/title>\n\n\n\n\n\n\n\n\n\n\n\n\n\t\n\t\n\t\n\n\n\n\t\n\t\n\t\n