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Planta Daninha
Article . 2005
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Resistência de populações de capim-colchão (Digitaria ciliaris) aos herbicidas inibidores da Acetil Co-A Carboxilase Resistance of crab-grass (Digitaria ciliaris) populations to Acetyl-Co-A Carboxylase-inhibiting herbicides

Authors: R.F. López-Ovejero; S.J.P. Carvalho; M. Nicolai; L.H. Penckowski; P.J. Christoffoleti;

Resistência de populações de capim-colchão (Digitaria ciliaris) aos herbicidas inibidores da Acetil Co-A Carboxilase Resistance of crab-grass (Digitaria ciliaris) populations to Acetyl-Co-A Carboxylase-inhibiting herbicides

Abstract

O objetivo do presente trabalho foi avaliar as populações com suspeita de ocorrência de biótipos resistentes de Digitaria ciliaris aos herbicidas inibidores da AcetilCoA Carboxilase (ACCase), por meio de curvas de dose-resposta, bem como estabelecer o grau de resistência cruzada aos herbicidas cicloexanodionas (CHD) e ariloxifenoxipropionatos (APP) desses biótipos. O experimento foi conduzido em casa de vegetação, utilizando-se quatro populações com suspeita de resistência (R1, R2, R3 e R4) e uma população suscetível (S). O delineamento experimental adotado foi o de blocos ao acaso, com quatro repetições, sendo os tratamentos resultado da interação fatorial entre cinco populações, três herbicidas (fluazifop-p-butil, sethoxydim e tepraloxydim) e oito doses de herbicidas (0C, 0,06C, 0,125C, 0,5C, 1C, 2C, 4C e 10C), em que C é a dose comercial recomendada para cada produto. Foram realizadas avaliações de porcentagem de controle aos 28 dias após a aplicação (DAA). A partir dos resultados obtidos, conclui-se que as populações R1, R2, R3 e R4 apresentaram-se como biótipos resistentes aos herbicidas inibidores da ACCase, com diferentes níveis de resistência cruzada aos herbicidas com esse mecanismo de ação.This research aimed to verify the occurrence of resistant biotypes of crab-grass (Digitaria ciliaris) to Acetyl-Co-A Carboxylase (ACCase)-inhibiting herbicides through dose-response curves, as well as to establish the degree of cross resistance to the CHD and APP herbicides of these biotypes. The experiment was conducted in the greenhouse and tested four suspected resistant populations (R1, R2, R3 e R4) and a susceptible one (S). The experimental design adopted was randomized complete blocks with four replications, and the treatments were the result of a factorial interaction among five populations, three herbicides (fluazifop-p-butyl, sethoxydim and tepraloxydim), and eight rates (0C, 0.06C, 0.125C, 0.5C, 1C, 2C, 4C and 10C), where C is the recommended rate for each product. Control percentage was analyzed at 28 days after application (DAA). From the results obtained it could be concluded that the populations R1, R2, R3 and R4 were found to be resistant biotypes to ACCase-inhibiting herbicides with different levels of cross-resistance to the herbicides with this action mechanism.

Keywords

QH301-705.5, QK1-989, resistência cruzada, Botany, ACCase, Biology (General), biótipos, cross-resistance, biotypes

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
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