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19 April 2022 Efficacy of halosulfuron-methyl in the management of Navua sedge (Cyperus aromaticus): differential responses of plants with and without established rhizomes
Aakansha Chadha, Singarayer K. Florentine, Kunjithapatham Dhileepan, Christopher Turville, Kim Dowling
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Abstract

Navua sedge is a creeping perennial sedge commonly found in tropical environments and is currently threatening many agroecosystems and ecosystems in Pacific Island countries and northern Queensland, Australia. Pasture and crop productions have been significantly impacted by this weed. The efficacy of halosulfuron-methyl on Navua sedge plants with and without well-established rhizomes was evaluated under glasshouse conditions. Halosulfuron-methyl was applied to plants with established rhizomes at three stages; mowed, pre-flowering, and flowering growth stages, whereas plants without established rhizomes were treated at seedling, pre-flowering and flowering growth stages. At each application time, halosulfuron-methyl was applied at four dose rates of 0, 38, 75, and 150 g ai ha–1. Mortality of 27.5%, 0%, and 5% was recorded in rhizomatous Navua sedge when treated with 75 g ai ha–1 of halosulfuron-methyl at the mowed, pre-flowering stage and flowering stages, respectively. At 10 wk after treatment (WAT), there were no tillers in surviving plants treated at any of the application times. By 16 WAT, the number of tillers increased to 15, 24, and 26 in mowed, pre-flowering, and flowering stages, respectively. Although halosulfuron-methyl is effective in controlling aboveground growth, subsequent emergence of new growth from the rhizome confirms the failure of the herbicide to kill the rhizome. Application of 75 g ai ha–1 of halosulfuron-methyl provided 100% mortality in plants treated at seedling and pre-flowering stages, and 98% mortality when treated at flowering stage in non-rhizomatous plants. A single application of halosulfuron-methyl is highly effective at controlling Navua sedge seedlings but not effective at controlling plants with established rhizomes.

Nomenclature: Halosulfuron-methyl; Navua sedge; Cyperus aromaticus (Ridley) Mattf. & Kukenth

© The Author(s), 2022. Published by Cambridge University Press on behalf of the Weed Science Society of America.
Aakansha Chadha, Singarayer K. Florentine, Kunjithapatham Dhileepan, Christopher Turville, and Kim Dowling "Efficacy of halosulfuron-methyl in the management of Navua sedge (Cyperus aromaticus): differential responses of plants with and without established rhizomes," Weed Technology 36(3), 397-402, (19 April 2022). https://doi.org/10.1017/wet.2022.29
Received: 6 November 2021; Accepted: 29 March 2022; Published: 19 April 2022
JOURNAL ARTICLE
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KEYWORDS
chemical control
Halosulfuron-methyl
Kyllinga polyphylla
rhizome
weed management
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