Integrated management of tough lovegrass (Eragrostis plana Nees): associating chemical control tools and plant physiology

Eduardo Avelino Faleiro,Eduardo Bohrer De Azevedo,Fabiane Pinto Lamego,Diego Martins Chiapinotto,Carlos Eduardo Schaedler

doi:10.1590/0103-8478cr20200271

Abstract

ABSTRACT: The objective of the study was to evaluate the efficiency of herbicides use in the control of tough lovegrass according to the availability of solar radiation and the presence or absence of flooded. Two experiments were conducted in a completely randomized design, in a 2x2x4 and 2x2x5 factorial scheme, where factor A was equivalent to the environment (natural or reduced radiation); factor B to water condition (with a 2 cm flooded or without); and, factor C the herbicides: cyhalofop butyl (315 g ha-1), glyphosate (1080 g ha-1), cyhalofop butyl + glyphosate (315 g ha-1 + 1080 g ha-1) and control (without application) in the first experiment. In the second experiment, the herbicides used were cyhalofop butyl (315 g ha-1), glyphosate (1080 g ha-1), sethoxydim (184g ha-1), imazethapyr (106 g ha-1) and control (without application). Glyphosate efficiently controls plants of tough lovegrass with four tillers (>90%), being superior to cyhalofop, imazethapyr and sethoxydim; independently, of resource conditions. Reduction in the availability of solar radiation generates less shoot dry mass production from the weed, and improves the control only by imazethapyr and cyhalofop. In general, a flooded condition does not affect tough lovegrass control by herbicides.

Highlights

Tough lovegrass (Eragrostis plana Nees) is a grass from South Africa, present in Rio Grande do Sul since the ‘50 (KISSMANN, 1991)
Tough lovegrass spread successfully, displaced native plants and caused problems for Brazilian livestock cattle herds (BARBOSA et al, 2013). It is considered the main weed of native pastures in southern Brazil (GOULART et al, 2012)
× 4 factorial scheme, where factor A was equivalent to the environment; factor B at the condition with or without flooded (2 cm); and factor C to herbicides: cyhalofop-butyl (315 g ha-1) – acetyl-coenzyme A carboxylase (ACCase) inhibitors, glyphosate (1080 g ha-1) – EPSPs inhibitors, cyhalofop-butyl + glyphosate (315 g ha-1 + 1080 g ha-1) and control

Summary

Introduction

Tough lovegrass (Eragrostis plana Nees) is a grass from South Africa, present in Rio Grande do Sul since the ‘50 (KISSMANN, 1991). Tough lovegrass spread successfully, displaced native plants and caused problems for Brazilian livestock cattle herds (BARBOSA et al, 2013). It is considered the main weed of native pastures in southern Brazil (GOULART et al, 2012). Control of an invasive species is often difficult to implement after its establishment (BARBOSA et al, 2013). Among the methods used for the management of weeds such as grass, the chemical control is widely used (GREEN & OWEN, 2011).

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Conclusion