{"id":3250,"date":"2024-10-02T14:28:59","date_gmt":"2024-10-02T17:28:59","guid":{"rendered":"https:\/\/agronegociobrasileiro.agr.br\/portal\/?p=3250"},"modified":"2024-10-02T14:28:59","modified_gmt":"2024-10-02T17:28:59","slug":"acaro-rajado-perdas-potenciais-da-ordem-de-20","status":"publish","type":"post","link":"https:\/\/portalmaisagro.com\/?p=3250","title":{"rendered":"\u00c1caro-rajado: perdas potenciais da ordem de 20%"},"content":{"rendered":"

Se n\u00e3o for controlado quando atingir 10% de plantas de algod\u00e3o infestadas, em uma \u00e1rea com potencial produtivo da ordem de 5,2 mil quilos por hectare, o \u00e1caro-rajado (Tetranychus urticae<\/i>) tende a ocasionar perdas estimadas em 20% \u00e0 lavoura, equivalentes a mais de 1 000 kg da fibra por hectare. A proje\u00e7\u00e3o vem do pesquisador Jacob Crosariol Netto, do IMA \u2013 Instituto Mato-Grossense do Algod\u00e3o. Ele ressalta que a praga, considerada secund\u00e1ria at\u00e9 cerca de cinco anos atr\u00e1s, ganhou protagonismo no manejo do algodoeiro.<\/p>\n

\n

\u201cEra uma praga que chegava em final de ciclo, em ambiente seco, ou do meio para o final da safra. Demandava certo cuidado, mas o produtor conseguia resolver e conviver facilmente com ela. Hoje, o \u00e1caro-rajado se faz presente durante todo o ciclo do algod\u00e3o\u201d, descreve Crosariol Netto.<\/strong><\/p>\n<\/blockquote>\n

Segundo ele, nas regi\u00f5es mato-grossenses de Campo Verde e Primavera do Leste, trabalhos em n\u00edvel de campo apontaram que o uso excessivo de fungicidas, para doen\u00e7as foliares, e de inseticidas de baixa seletividade, acaba por eliminar inimigos naturais do \u00e1caro-rajado. \u201cTais mol\u00e9culas n\u00e3o controlam o \u00e1caro e aceleram seu ciclo reprodutivo. Isso faz com que as popula\u00e7\u00f5es dele se multipliquem e ressurjam de maneira muito r\u00e1pida\u201d, refor\u00e7a o pesquisador.<\/p>\n

Esse cen\u00e1rio, recomenda Crosariol Netto, exige cuidados espec\u00edficos no tocante \u00e0s aplica\u00e7\u00f5es de acaricidas, entre outras medidas protetivas. \u201cNo passado, faz\u00edamos duas, tr\u00eas aplica\u00e7\u00f5es destes produtos. Hoje, chegamos a at\u00e9 12 na safra, dependendo da regi\u00e3o do estado de Mato Grosso\u201d, revela.<\/p>\n

Crosariol Netto foi um dos profissionais respons\u00e1veis por conduzir ensaios atrelados ao ingrediente ativo acaricida fenpiroximato, da Sipcam Nichino Brasil, h\u00e1 pouco registrado nos \u00f3rg\u00e3os reguladores para controle do \u00e1caro-rajado. Segundo avalia o pesquisador do IMA, integrado aos sistemas de manejo da cultura, e em rota\u00e7\u00e3o a outros ativos, a solu\u00e7\u00e3o da companhia de origem \u00edtalo-japonesa resultou em efic\u00e1cia de controle superior a 80%.<\/p>\n

\u201cTemos de aplicar em condi\u00e7\u00e3o de controle, quando a popula\u00e7\u00e3o do \u00e1caro-rajado estiver no n\u00edvel ideal, com 10% de plantas infestadas\u201d, enfatiza o pesquisador. \u201cAs solu\u00e7\u00f5es existentes, como o fenpiroximato, pedem tamb\u00e9m uma boa tecnologia de aplica\u00e7\u00e3o, porque o \u00e1caro se instala na parte abaxial da folha, para se alimentar, e necessitamos atingir o alvo com uma boa distribui\u00e7\u00e3o de gotas\u201d, ele assinala.<\/p>\n

Crosariol Netto ressalta ainda que o manejo eficaz do \u00e1caro-rajado requer monitoramento constante de lavouras, al\u00e9m da busca por recursos alternativos capazes de deter a praga. \u201cAo escolher cultivares com sanidade melhor para evitar doen\u00e7as e, consequentemente, diminuir o uso de fungicidas, reduzimos o desequil\u00edbrio em rela\u00e7\u00e3o aos inimigos naturais do \u00e1caro-rajado\u201d, exemplifica.<\/p>\n

\u201cA praga \u00e9 crescente. Dependemos bastante da efetividade na rota\u00e7\u00e3o de ativos, porque o ciclo de desenvolvimento do \u00e1caro-rajado \u00e9 r\u00e1pido. Se forem feitas aplica\u00e7\u00f5es sequenciais de um mesmo ingrediente ativo na lavoura, ser\u00e3o selecionadas mais popula\u00e7\u00f5es resistentes. Com o manejo estruturado, por\u00e9m, \u00e9 poss\u00edvel conviver bem com a praga\u201d, conclui Jacob Crosariol Netto.<\/p>\n","protected":false},"excerpt":{"rendered":"

Se n\u00e3o for controlado quando atingir 10% de plantas de algod\u00e3o infestadas, em uma \u00e1rea com potencial produtivo da ordem de 5,2 mil quilos por hectare, o \u00e1caro-rajado (Tetranychus urticae) tende a ocasionar perdas estimadas em 20% \u00e0 lavoura, equivalentes a mais de 1 000 kg da fibra por hectare.…<\/p>\n","protected":false},"author":9,"featured_media":3251,"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":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[3,18],"tags":[],"class_list":["post-3250","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-agricultura","category-algodao"],"yoast_head":"\n\u00c1caro-rajado: perdas potenciais da ordem de 20% - 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