Premium
Selectivity and Fate of Monosodium Methylarsenate in Bermudagrass, Centipedegrass, and Seashore Paspalum
Author(s) -
Yu Jialin,
McCullough Patrick E.,
Czarnota Mark A.
Publication year - 2017
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci2016.05.0291
Subject(s) - paspalum , cynodon dactylon , biology , cynodon , agronomy , poaceae , paspalum notatum
Centipedegrass [ Eremochloa ophiuroides (Munro) Hack.] and seashore paspalum ( Paspalum vaginatum Sw.) can be weedy species with other turfgrasses. Monosodium methylarsenate (MSMA) selectively controls these grasses in polyculture with tolerant species such as bermudagrass [ Cynodon dactylon (L.) Pers.], but the mechanisms of selectivity are not well understood. The objectives of this research were to investigate the efficacy and behavior of MSMA in bermudagrass, centipedegrass, and seashore paspalum. In greenhouse experiments, the hierarchical rank of injury ranges for species from high to low was centipedegrass > seashore paspalum > bermudagrass. Monosodium methylarsenate reduced dry shoot biomass of centipedegrass and seashore paspalum six and three times greater than bermudagrass after 4 wk, respectively. The hierarchical rank of lipid peroxidation after MSMA treatments, as measured by malondialdehyde (MDA) content, from high to low was centipedegrass > seashore paspalum > bermudagrass. Grasses reached peak foliar absorption of 14 C‐MSMA at 1 d after treatment (DAT), but differences among species were not detected. There was no metabolism of 14 C‐MSMA in any species at 1, 3, or 7 DAT, suggesting MSMA could remain bioavailable in clippings of tolerant and susceptible grasses. Overall, the selectivity of MSMA in warm‐season turfgrasses is associated with differential levels of lipid peroxidation.