Mefenpyr-diethyl as a safener for haloxyfop-methyl in bahiagrass

Roque De Carvalho Dias,Leandro Tropaldi,Paulo Vinicius Da Silva,Vitor Muller Anunciato,Leandro Bianchi,Caio Antonio Carbonari,Edivaldo Domingues Velini

doi:10.1590/2447-536x.v27i3.2306

Roque De Carvalho Dias, Leandro Tropaldi + Show 5 more

Open Access

https://doi.org/10.1590/2447-536x.v27i3.2306

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Abstract

Abstract Mefenpyr-diethyl is a foliar-acting safener of the pyrazoline chemical group, and after its absorption, the metabolization and detoxification of herbicides occur in treated plants. Studies have demonstrated the protective effect of this safener for the herbicide fenoxaprop-P-ethyl in grass. Thus, this work aimed to evaluate whether a tank mixture of mefenpyr-diethyl has a protective response to haloxyfop-methyl in non-perennial bahiagrass. The experiment had a completely randomized design and was carried out in a greenhouse, using five replications with a 10x2 factorial scheme and ten doses of haloxyfop-methyl (0.00, 0.24, 0.49, 0.97, 1.95, 3.90, 7.79, 15.59, 31.28, and 62.35 g a.i. ha-1) in the presence or absence of a tank mixture of mefenpyr-diethyl (50 g a.i. ha-1). Phytotoxicity and electron transport rate (ETR) were evaluated at 7, 14, 21, and 28 days after application (DAA), in addition to plant height and dry biomass at 28 DAA. In general, phytotoxicity increased due to the higher levels of the herbicide haloxyfop-methyl. The application of mefenpyr-diethyl, in turn, provided lower levels of phytotoxicity, as well as lower reductions in ETR, height, and dry biomass when compared to untreated plants. These results show the safener action of a tank mixture of mefenpyr-diethyl on low doses of haloxyfop-methyl in non-perennial bahiagrass.

Highlights

Native to the American continent, the species popularly known as bahiagrass (Paspalum notatum Flügge) is a creeping, low-growing, perennial plant that forms a dense cover over the soil
The effectiveness of herbicides relies on different variables, such as herbicide selectivity, which in some cases can be achieved using safeners or chemical protectors, allowing the increase in crop selectivity and enabling different alternatives for chemical weed control (Hatzios and Burgos, 2004; Busi et al, 2017)
The experiment was performed in a randomized complete block design, using five replications with a 10x2 factorial scheme and ten doses of the herbicide in the presence or absence of a spray mixture of mefenpyrdiethyl (50 g a.i. “active ingredient” ha-1)

Summary

Introduction

Native to the American continent, the species popularly known as bahiagrass (Paspalum notatum Flügge) is a creeping, low-growing, perennial plant that forms a dense cover over the soil. It is very persistent, reproduces through seeds, and multiplies from rhizomes (Steiner et al, 2017). It presents high rusticity, increased resistance to drought and acidic soils, and low fertility. It is mainly used as lawn in low-maintenance areas, such as the. The effectiveness of herbicides relies on different variables, such as herbicide selectivity, which in some cases can be achieved using safeners or chemical protectors, allowing the increase in crop selectivity and enabling different alternatives for chemical weed control (Hatzios and Burgos, 2004; Busi et al, 2017)

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