alternativas de manejo químico da planta daninha digitaria ciliaris resistente aos herbicidas inibidores da accase na cultura de soja chemical management alternatives of the weed digitaria ciliaris resistant to accase inhibiting herbicides in soybean crop
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ID: 136064
2006
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Abstract
Com o objetivo de avaliar a eficácia dos herbicidas inibidores da ACCase sobre uma população de capim-colchão (Digitaria ciliaris) com histórico de falha de controle, bem como propor herbicidas alternativos a serem aplicados em condições de pré e pós-emergência na cultura de soja, foram conduzidos dois experimentos a campo no município de Palmeira-PR, durante o ano agrícola 2003/2004. No primeiro experimento, foi avaliada a eficácia dos tratamentos envolvendo herbicidas com mecanismo de ação de inibição da ACCase (g ha-1): sethoxydim (230), clethodim (108), butroxydim (75), tepraloxydim (100), fluazifop-p-butil (187,5), haloxyfop-r (60), propaquizafop (125), cyhalofop-butyl (225), fenoxaprop-p-ethyl + clethodim (50 + 50), além de testemunha sem herbicidas. No segundo experimento, os tratamentos constaram de herbicidas com mecanismos de ação alternativos, visando também o teste de eficácia de controle da planta daninha (g ha-1): trifluralina (2.700), clomazone (1.000), smetolachlor (1.920), sulfentrazone (600), trifluralina + sulfentrazone (2.100 + 400), clomazone + sulfentrazone (600 + 400), S-metolachlor + sulfentrazone (768 + 400) aplicados em condições de pré-emergência da planta daninha e da cultura e testemunha sem controle de plantas daninhas; os tratamentos apresentavam-se com ou sem complementação de controle através do herbicida imazethapyr (100), aplicado em condições de pós-emergência, com as plantas daninhas no estádio de duas a quatro folhas. Os resultados sugerem que a população estudada é resistente aos herbicidas inibidores da ACCase; os melhores resultados de eficácia de controle com os inibidores da ACCase foram obtidos com os herbicidas tepraloxydim, clethodim e butroxydim; os tratamentos com sulfentrazone isoladamente ou em mistura e os tratamentos com trifluralina, clomazone e S-metolachlor, em complementação com imazethapyr e imazethapyr isolado, foram eficazes no controle do biótipo resistente de Digitaria ciliaris, permitindo assim a recomendação destes tratamentos como alternativas de manejo de populações resistentes da planta daninha.
The objective of this work was to evaluate the efficacy of aplying ACCase inhibiting herbicides on a population of the weed large crabgrass (Digitaria ciliaris) with a history of control failure, as well as to propose alternative herbicides to be sprayed in pre- and post-emergence on the soybean crop. Thus, two field experiments were carried out in Palmeira (PR), Brazil, during the growing season 2003/2004. The first experiment evaluated the efficacy of the ACCase inhibiting herbicides (g ha-1): sethoxydim (230); clethodim (108); butroxydim (75); tepraloxydim (100); fluazifop-p-butyl (187.5); haloxyfop-r (60); propaquizafop (125); cyhalofop-butyl (225); fenoxaprop-p-ethyl + clethodim (50 + 50) and weeded check. The second experiment consisted of treatments using herbicides with alternative mechanism of action (g ha-1): trifluralina (2,700); clomazone (1,000); S-metolachlor (1,920); sulfentrazone (600); trifluralina + sulfentrazone (2,100 + 400); clomazone + sulfentrazone (600 + 400); S-metolachlor + sulfentrazone (768 + 400) in pre-emergence and a weeded check; all herbicides were applied with or without imazethapyr (100) application in post-emergence, sprayed when the weeds were at the stage of 2 to 4 leaves. The results suggested that the population studied is resistant to ACCase inhibiting herbicides; the best results of control efficacy with the ACCase inhibiting herbicides were obtained with tepraloxydim, clethodim and butroxydim; the treatments with sulfentrazone, alone or in mixture; the treatments with trifluralin, clomazone and S-metoalachlor, with imazethapyr complementation and imazethapyr alone were effective in controlling the resistant biotype of Digitaria ciliaris, showing that these treatments are management alternatives for the control of weed resistant populations.
The objective of this work was to evaluate the efficacy of aplying ACCase inhibiting herbicides on a population of the weed large crabgrass (Digitaria ciliaris) with a history of control failure, as well as to propose alternative herbicides to be sprayed in pre- and post-emergence on the soybean crop. Thus, two field experiments were carried out in Palmeira (PR), Brazil, during the growing season 2003/2004. The first experiment evaluated the efficacy of the ACCase inhibiting herbicides (g ha-1): sethoxydim (230); clethodim (108); butroxydim (75); tepraloxydim (100); fluazifop-p-butyl (187.5); haloxyfop-r (60); propaquizafop (125); cyhalofop-butyl (225); fenoxaprop-p-ethyl + clethodim (50 + 50) and weeded check. The second experiment consisted of treatments using herbicides with alternative mechanism of action (g ha-1): trifluralina (2,700); clomazone (1,000); S-metolachlor (1,920); sulfentrazone (600); trifluralina + sulfentrazone (2,100 + 400); clomazone + sulfentrazone (600 + 400); S-metolachlor + sulfentrazone (768 + 400) in pre-emergence and a weeded check; all herbicides were applied with or without imazethapyr (100) application in post-emergence, sprayed when the weeds were at the stage of 2 to 4 leaves. The results suggested that the population studied is resistant to ACCase inhibiting herbicides; the best results of control efficacy with the ACCase inhibiting herbicides were obtained with tepraloxydim, clethodim and butroxydim; the treatments with sulfentrazone, alone or in mixture; the treatments with trifluralin, clomazone and S-metoalachlor, with imazethapyr complementation and imazethapyr alone were effective in controlling the resistant biotype of Digitaria ciliaris, showing that these treatments are management alternatives for the control of weed resistant populations.
| Reference Key |
lpez-ovejero2006plantaalternativas
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|---|---|
| Authors | ;R.F. López-Ovejero;L.H. Penckowski;M.J. Podolan;S.J.P. Carvalho;P.J. Christoffoleti |
| Journal | anti-cancer agents in medicinal chemistry |
| Year | 2006 |
| DOI |
10.1590/S0100-83582006000200026
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| URL | |
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