{"id":64887,"date":"2019-09-06T09:00:15","date_gmt":"2019-09-06T13:00:15","guid":{"rendered":"https:\/\/www.agribusinessglobal.com\/?p=64887"},"modified":"2021-06-14T15:36:14","modified_gmt":"2021-06-14T19:36:14","slug":"top-5-ways-pigweed-spreads-and-what-you-can-do-about-it","status":"publish","type":"post","link":"https:\/\/www.agribusinessglobal.com\/pt\/agrochemicals\/herbicides\/top-5-ways-pigweed-spreads-and-what-you-can-do-about-it\/","title":{"rendered":"As 5 principais maneiras pelas quais a erva-de-porco se espalha \u2013 e o que voc\u00ea pode fazer a respeito"},"content":{"rendered":"<p>\u00c0s vezes, parece que at\u00e9 mesmo o pr\u00f3prio ato de cultivar pode espalhar o amaranto Palmer, ou erva-de-porco, por terras agr\u00edcolas dos EUA. A erva daninha agressiva pode produzir um milh\u00e3o de sementes de uma \u00fanica planta. Ela pode infestar fazendas por meio de sementes transportadas em equipamentos agr\u00edcolas de segunda m\u00e3o, por colheitadeiras, na ra\u00e7\u00e3o para gado ou at\u00e9 mesmo sendo sopradas para dentro das fazendas por meio do corte de grama na beira da estrada.<\/p>\n<p>Estrat\u00e9gias individuais para controlar a erva daninha variam de pesticidas a lavagem de equipamentos agr\u00edcolas sob press\u00e3o, capina manual ou at\u00e9 mesmo queima de \u00e1reas infestadas. Por si s\u00f3, no entanto, essas estrat\u00e9gias s\u00e3o apenas parcialmente bem-sucedidas. Como evitar completamente a contamina\u00e7\u00e3o \u00e9 praticamente imposs\u00edvel, os especialistas em ervas daninhas est\u00e3o se concentrando em educar os agricultores sobre como resistir \u00e0 dissemina\u00e7\u00e3o da erva daninha por meio de v\u00e1rios modos de tratamento.<\/p>\n<p>Vamos dar uma olhada mais de perto em como a caruru se espalha e em maneiras de resistir ao crescente dom\u00ednio dela nas terras agr\u00edcolas americanas.<\/p>\n<h2>Como uma \u201cerva daninha nociva proibida\u201d se torna uma grande amea\u00e7a<\/h2>\n<p>No ver\u00e3o passado, sob uma nova regra de emerg\u00eancia, a erva-caruru foi rotulada como uma \u201csemente de erva daninha nociva proibida\u201d em Wisconsin. Em Dakota do Norte, a erva-caruru tamb\u00e9m foi vista pela primeira vez no ver\u00e3o de 2018 e j\u00e1 foi chamada de \u201cuma grande amea\u00e7a \u00e0 produ\u00e7\u00e3o agr\u00edcola de Dakota do Norte\u201d por <a href=\"https:\/\/www.ag.ndsu.edu\/palmeramaranth\" target=\"_blank\" rel=\"noopener noreferrer\">Universidade Estadual de Dakota do Norte<\/a>.<\/p>\n<p>Na verdade, a erva-caruru j\u00e1 se espalhou pela maior parte dos EUA continentais. Andrew Kniss, um pesquisador de ervas daninhas da Universidade de Wyoming, tem monitorado a infesta\u00e7\u00e3o de erva-caruru em seu <a href=\"https:\/\/plantoutofplace.com\/2018\/08\/palmer-amaranth-current-state-level-distribution-in-the-us\/\" target=\"_blank\" rel=\"noopener noreferrer\">blog pessoal<\/a>, e o n\u00famero de estados afetados atualmente \u00e9 de 30, variando da Calif\u00f3rnia a Massachusetts, e literalmente dezenas de estados entre eles.<\/p>\n<p>O que pode ser surpreendente s\u00e3o as muitas maneiras pelas quais a semente pode invadir fazendas. Em junho de 2018, Wisconsin Weed Science, um programa de comunica\u00e7\u00f5es sob o <a href=\"http:\/\/www.wiscweeds.info\/post\/palmer-amaranth-is-now-a-prohibited-noxious-weed-seed-in-wisconsin-but-what-does-it-look-like\/\" target=\"_blank\" rel=\"noopener noreferrer\">A Universidade de Wisconsin em Madison tomou nota<\/a> de duas maneiras de introduzir a erva-caruru:<\/p>\n<ul>\n<li><strong><em>Sementes contaminadas<\/em><\/strong>. Misturas de sementes de conserva\u00e7\u00e3o ou polinizadores contaminadas estavam entre os meios de dissemina\u00e7\u00e3o detalhados pela universidade, que tamb\u00e9m disse que \u201cequipamentos que se deslocam de \u00e1reas infestadas de amaranto-palmer tamb\u00e9m podem transportar sementes\u201d.<\/li>\n<li><strong><em>Equipamentos de segunda m\u00e3o.<\/em><\/strong> Mark Renz, especialista em ervas daninhas da Universidade de Wisconsin-Madison, falando em um dia de campo sobre agronomia e solos na Esta\u00e7\u00e3o de Pesquisa Agr\u00edcola de Arlington, teorizou que ra\u00e7\u00e3o de fora do estado, maquin\u00e1rio agr\u00edcola ou ambos entrando em Wisconsin podem ser respons\u00e1veis pelo aumento da infesta\u00e7\u00e3o de amaranto-palmer no estado.<\/li>\n<\/ul>\n<p>Isso n\u00e3o \u00e9 resultado de descuido. Cada semente de caruru \u00e9 t\u00e3o pequena quanto a cabe\u00e7a de um alfinete. Um pequeno frasco de apenas alguns mililitros de volume pode conter milhares de sementes.<\/p>\n<p>Mesmo uma \u00fanica semente que escapasse, caindo no ch\u00e3o e germinando, poderia produzir um milh\u00e3o de sementes por planta \u2014 ou literalmente um bilh\u00e3o em apenas alguns anos.<\/p>\n<p>Existem mais fontes de infesta\u00e7\u00e3o do que as descritas pela Universidade de Wisconsin:<\/p>\n<ul>\n<li><strong><em>Ra\u00e7\u00e3o para gado.<\/em><\/strong> Se fazendeiros atingidos pela seca comprarem ra\u00e7\u00e3o para gado de uma \u00e1rea com infesta\u00e7\u00e3o de caruru, ela pode passar para terras agr\u00edcolas. J\u00e1 em 2012, <a href=\"https:\/\/www.purdue.edu\/newsroom\/releases\/2012\/Q4\/aggressive-palmer-amaranth-weed-found-in-northern-indiana.html\" target=\"_blank\" rel=\"noopener noreferrer\">A Universidade Purdue especulou<\/a> que \u201ca fonte dessas popula\u00e7\u00f5es de ervas daninhas pode ser o esterco de gado espalhado nos campos, com ra\u00e7\u00f5es que continham sementes de algod\u00e3o ou cascas de sementes de algod\u00e3o infestadas com sementes de palmeira\u201d.<\/li>\n<li><strong><em>Combina\u00e7\u00e3o personalizada.<\/em><\/strong> A combina\u00e7\u00e3o personalizada cria uma oportunidade para infesta\u00e7\u00e3o de caruru, especialmente nas Dakotas e nas plan\u00edcies altas. \u00c9 comum que quatro a oito combina\u00e7\u00f5es em uma equipe v\u00e3o de uma fazenda para outra. Se alguma dessas fazendas tiver Palmer, as combina\u00e7\u00f5es provavelmente as mover\u00e3o.<\/li>\n<li><strong><em>Corte de grama na beira da estrada.<\/em><\/strong> Dirija por qualquer estrada do condado em Illinois, Indiana ou Iowa, por exemplo, e voc\u00ea ver\u00e1 \u00e1reas gramadas na beira da estrada cheias de caruru e outras ervas daninhas nocivas. Conforme os cortadores cortam a grama, eles podem redirecionar as sementes de volta para as terras agr\u00edcolas. Para piorar a situa\u00e7\u00e3o, quando valas na beira da estrada inundam \u2014 o que n\u00e3o \u00e9 incomum \u2014 onde a \u00e1gua se deposita tamb\u00e9m \u00e9 onde as ervas daninhas se depositam.<\/li>\n<\/ul>\n<p>Alguns governos locais est\u00e3o tomando medidas para minimizar a dissemina\u00e7\u00e3o da erva-de-porco por esses meios. <a href=\"https:\/\/www.dot.state.mn.us\/roadsides\/vegetation\/pdf\/noxiousweeds.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">O Departamento de Transportes de Minnesota listou<\/a> Amaranto palmer em sua lista de esp\u00e9cies invasoras \u201cProibido: Erradicar\u201d. Entre as diretrizes oferecidas pelo estado para evitar o estabelecimento da erva daninha est\u00e3o \u201cusar fogo para melhorar o ambiente para a comunidade de plantas nativas concorrentes\u201d e o uso de herbicidas pr\u00e9-emergentes e p\u00f3s-emergentes.<\/p>\n<p>\u201cSe houver sementes, n\u00e3o corte\u201d, dizem as diretrizes estaduais.<\/p>\n<h2>\u201cNenhuma Erva-Caruru Deixada para Tr\u00e1s\u201d: T\u00e1ticas da Academia<\/h2>\n<p>Como mencionado anteriormente, as universidades est\u00e3o tomando medidas para garantir que a erva-caruru possa ser controlada o m\u00e1ximo poss\u00edvel.<\/p>\n<p>Em 2018, a Ohio State University, juntamente com o United Soybean Board e o Ohio Soybean Council, lan\u00e7ou a campanha \u201cNo Pigweed Left Behind\u201d. <a href=\"https:\/\/cpb-us-w2.wpmucdn.com\/u.osu.edu\/dist\/7\/3461\/files\/2018\/12\/2019-Palmer-overview-fact-23n4rw1.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">programa lista diversas precau\u00e7\u00f5es<\/a> para fazendeiros para prevenir infesta\u00e7\u00e3o. Essas precau\u00e7\u00f5es s\u00e3o parte de uma estrat\u00e9gia multimodo e incluem:<\/p>\n<ul>\n<li>Ao comprar equipamento usado, saiba onde ele esteve anteriormente e evite comprar colheitadeiras de \u00e1reas infestadas de Palmer.<\/li>\n<li>Scout semeou recentemente \u00e1reas para verificar a presen\u00e7a da erva daninha. (De acordo com o programa, o Departamento de Agricultura de Ohio testar\u00e1 lotes de sementes para sementes de Palmer.)<\/li>\n<li>Incluir herbicidas residuais para controlar plantas Palmer que emergem precocemente.<\/li>\n<li>Campos de reconhecimento come\u00e7ando em meados de julho para Palmer que escaparam dos programas de herbicidas. Plantas sem sementes maduras devem ser arrancadas ou cortadas logo abaixo do solo e removidas do campo, e ent\u00e3o queimadas ou enterradas a pelo menos um p\u00e9 de profundidade ou compostadas.<\/li>\n<li>N\u00e3o passe colheitadeiras por planta\u00e7\u00f5es de Palmer descobertas durante a colheita.<\/li>\n<\/ul>\n<p>A Universidade Estadual da Pensilv\u00e2nia, por meio de sua Extens\u00e3o Penn State, tamb\u00e9m <a href=\"https:\/\/extension.psu.edu\/invasive-pigweeds-palmer-amaranth-and-waterhemp\" target=\"_blank\" rel=\"noopener noreferrer\">oferece conselhos consider\u00e1veis<\/a>. Suas estrat\u00e9gias incluem:<\/p>\n<ul>\n<li>Plante apenas sementes certificadas de culturas limpas.<\/li>\n<li>Use pr\u00e1ticas de manejo integrado para controlar agressivamente ervas daninhas. (Isso inclui, diz a Penn State, diminuir a largura das fileiras para um fechamento mais r\u00e1pido do dossel e forma\u00e7\u00e3o de sombra. As sementes de amaranto palmer precisam de luz para germinar.)<\/li>\n<li>Se poss\u00edvel, controle os campos infestados sem preparo do solo, deixando quaisquer sementes potenciais perto da superf\u00edcie do solo.<\/li>\n<li>Use herbicidas residuais (pr\u00e9 e p\u00f3s) durante a esta\u00e7\u00e3o de crescimento.<\/li>\n<li>Aplique herbicidas eficazes em plantas com menos de dez cent\u00edmetros de altura.<\/li>\n<\/ul>\n<h2>A necessidade de planejamento multimodal<\/h2>\n<p>O que est\u00e1 claro \u00e9 que uma abordagem multimodo \u00e9 necess\u00e1ria para controlar a dissemina\u00e7\u00e3o da erva-caruru. Isso combina capina manual nos est\u00e1gios iniciais e aplica\u00e7\u00e3o de herbicidas pr\u00e9 e p\u00f3s-emergentes \u2013 al\u00e9m de ser cauteloso sobre a colheita combinada e limpar cuidadosamente o equipamento comprado onde a erva-caruru j\u00e1 est\u00e1 estabelecida.<\/p>\n<p>\u00c9 claro que h\u00e1 problemas associados a cada uma dessas t\u00e1ticas individualmente.<\/p>\n<p>No caso de uma infesta\u00e7\u00e3o moderada, trabalhadores bra\u00e7ais podem ser capazes de arrancar a erva-de-porco antes da colheita. Mas chega um ponto em que a economia pro\u00edbe esse tipo de trabalho. Eventualmente, pode custar mais para remover todas as ervas daninhas do que a colheita vale.<\/p>\n<p>Al\u00e9m disso, a erva-caruru se tornou resistente a alguns herbicidas. A Ohio State University reconhece que \u201ca maioria das popula\u00e7\u00f5es de Palmer em Ohio s\u00e3o resistentes ao glifosato\u201d e que a erva daninha \u201cn\u00e3o ser\u00e1 controlada apenas pela queima ou aplica\u00e7\u00f5es p\u00f3s-emergentes de glifosato\u201d.<\/p>\n<p>Um herbicida que est\u00e1 tendo sucesso consider\u00e1vel em \u00e1reas onde o glifosato pode n\u00e3o funcionar \u00e9 o piridato. Este produto qu\u00edmico \u00e9 um herbicida seletivo para controle p\u00f3s-emerg\u00eancia de ervas daninhas anuais de folhas largas em crescimento ativo, incluindo o amaranto-palmer. Foi demonstrado que o piridato fornece controle de at\u00e9 100%, mesmo em cepas resistentes a herbicidas.<\/p>\n<p>Como a erva-caruru \u00e9 resistente a herbicidas, o tratamento deve fazer parte de um programa planejado. Vamos usar o milho como exemplo. Um bom plano seria usar piridato nos est\u00e1gios iniciais, quando o milho pode ter seis folhas. Ap\u00f3s a aplica\u00e7\u00e3o inicial, pode ser melhor retornar com piridato, mesotriona e atrazina para matar quaisquer ervas daninhas menores que estejam presentes.<\/p>\n<p>A erva-caruru \u00e9 uma planta teimosa que pode causar estragos em fazendas. Com planejamento adequado, no entanto, os fazendeiros podem resistir \u00e0 dissemina\u00e7\u00e3o da erva-caruru e continuar com os neg\u00f3cios da agricultura.<\/p>","protected":false},"excerpt":{"rendered":"<p>\u00c0s vezes parece que at\u00e9 mesmo o pr\u00f3prio ato de cultivar pode espalhar o amaranto-palmeriano, ou caruru, por terras agr\u00edcolas dos EUA. O\u2026<\/p>","protected":false},"author":110,"featured_media":52675,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[19,1846],"tags":[],"class_list":["post-64887","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-herbicides","category-sustainability"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Top 5 Ways Pigweed Spreads \u2013 And What You Can Do About It - AgriBusiness Global<\/title>\n<meta name=\"description\" content=\"It sometimes seems that even the very act of farming can spread Palmer amaranth, or pigweed, across U.S. farmland. 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