Abstract
AbstractHerbicide management information is lacking for recently developed turf-type bahiagrass germplasm. The objective of this study was to evaluate the herbicide tolerance of nine experimental bahiagrass genotypes compared to the industry standard ‘Argentine’. The experimental entries included Argentine and ‘Wilmington’ mutants, and wild-type breeding lines. Plants were grown under greenhouse conditions, and 12 herbicides were applied at 1× and 2× labeled rates. Bentazon, bromoxynil, carfentrazone + 2,4-D + MCPP + dicamba, and carfentrazone were classified as safe. Fluroxypyr, halosulfuron, and triclopyr + clopyralid reduced growth >50% when applied at twice the label rate. Fenoxaprop, sulfentrazone + imazethapyr, and thiencarbazone + iodosulfuron + dicamba reduced growth and caused turfgrass injury above an acceptable threshold (≥20%). In general, the Argentine mutants showed greater herbicide injury compared to the Wilmington mutants. However, metsulfuron exceeded the acceptable injury threshold and stopped growth in all the genotypes, Argentine and genotype WT6 were the least injured by this herbicide. The experimental genotype WT6 consistently showed the greatest herbicide tolerance. Except for one genotype (WT4), the experimental genotypes responded similarly or better than Argentine to the tested herbicides, except for metsulfuron.
Highlights
Landscape water restrictions and regulations are commonplace as a result of the increase in population and water use in urbanized areas (Boyer et al 2018)
Herbicide management information is lacking for recently developed turf-type bahiagrass germplasm
The objective of this study was to evaluate the herbicide tolerance of nine experimental bahiagrass genotypes compared to the industry standard ‘Argentine’
Summary
Landscape water restrictions and regulations are commonplace as a result of the increase in population and water use in urbanized areas (Boyer et al 2018). Bahiagrass is one species that possesses this attribute This native of South America is adapted to sandy soils, has low fertility requirements, and does not require high inputs of water (Boeri et al 2021; Burton 1943; Parodi 1937; Trenholm et al 2003). Compared to Argentine, Pensacola produces more seedheads, which make it less desirable for use in lawns but suitable for low-maintenance areas like roadsides (Trenholm et al 2003). A cultivar native to Argentina, has broad light-green leaves and produces shorter and fewer seedheads than Pensacola, making it acceptable for use as a lawn grass (Busey 1989; Rios et al 2013; Trenholm et al 2003). Argentine and Wilmington have better turf characteristics than do other cultivars on the market, their unsightly seedheads and open growth habit limit consumer acceptance (Rios et al 2017)
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