Confirming resistance to PPO-inhibiting herbicides applied preemergence and postemergence in a Georgia Palmer amaranth population

IF 1.3 3区农林科学 Q3 AGRONOMY

Weed Technology Pub Date : 2024-02-15 DOI:10.1017/wet.2024.12

Taylor Randell-Singleton, Lavesta C. Hand, Jenna C. Vance, Hannah E. Wright-Smith, A. Stanley Culpepper

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引用次数: 0

Abstract

Protoporphyrinogen oxidase- (PPO) inhibiting herbicides are used in over 40 agronomic and specialty crops across Georgia to manage weeds through residual and postemergence (POST) control. In 2017, a population of Palmer amaranth exhibiting reduced sensitivity to POST applications of PPO-inhibiting herbicides was identified by the University of Georgia. Seed were collected from the site along with a known sensitive population; distance between the samples was 200 m, increasing the likelihood of similar environmental and genetic characteristics. To quantify sensitivity for both preemergence (PRE) and POST uses, 21 greenhouse dose-response assessments were conducted from 2017 to 2022. After conducting initial rate response studies, 13 doses per herbicide were chosen for the POST experiment; field use rates of fomesafen (420 g ai ha-1), lactofen (219 g ai ha-1), acifluorfen (420 g ai ha-1), and trifludimoxazin (25 g ai ha-1) at rates ranging from 0 to 4X the field use rate for the susceptible population, and 0 to 40X for the suspect population were applied. Herbicide treatments included adjuvants and were applied to plants 8 to 10 cm in height. Relative resistance factors (RRF) were calculated for control ratings, mortality, and biomass, and ranged from 105 to 318, 36 to 1477, 215 to 316, and 9 to 49 for fomesafen, lactofen, acifluorfen, and trifludimoxazin, respectively. In the PRE experiment, herbicide applications included five to nine doses of fomesafen (1X=210 g ai ha-1), flumioxazin (1X=57 g ai ha-1), oxyfluorfen (1X=561 g ai ha-1), and trifludimoxazin (1X=38 g ai ha-1); doses ranged from 0 to 6X for the suspect population and 0 to 2X for the susceptible population. Visual control, mortality, and biomass RRF ranged from 3 to 5 for fomesafen, 21 to 31 for flumioxazin, 6 to 22 for oxyfluorfen, and 8 to 38 for trifludimoxazin. Results confirm that a Georgia Palmer amaranth population is resistant to PPO-inhibiting herbicides applied both PRE and POST.

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在佐治亚州的帕尔默苋群体中确认对芽前和芽后施用的 PPO 抑制除草剂的抗药性

原卟啉原氧化酶（PPO）抑制性除草剂在佐治亚州用于 40 多种农艺和特种作物，通过残留和芽后（POST）控制来管理杂草。2017 年，佐治亚大学发现一个帕尔默苋种群对 PPO 抑制性除草剂的苗后施用敏感性降低。从该地点采集了种子，同时采集的还有一个已知的敏感种群；样本之间的距离为 200 米，增加了环境和遗传特征相似的可能性。为了量化萌芽前（PRE）和萌芽后（POST）使用的敏感性，2017 年至 2022 年期间进行了 21 次温室剂量反应评估。在进行了初步的剂量反应研究后，为芽前、芽后试验选择了每种除草剂的 13 个剂量；对易感种群施用了田间使用率为 0 至 4 倍的福美双（420 克活性成分-公顷-1）、乳氟禾草灵（219 克活性成分-公顷-1）、丙炔氟草胺（420 克活性成分-公顷-1）和三氟禾草灵（25 克活性成分-公顷-1），对可疑种群施用了田间使用率为 0 至 40 倍的福美双（420 克活性成分-公顷-1）和丙炔氟草胺（25 克活性成分-公顷-1）。除草剂处理包括佐剂，施用在株高 8-10 厘米的植物上。针对福美双、乳氟禾草灵、唑螨酯和三氟禾草灵的防治等级、死亡率和生物量计算了相对抗性因子（RRF），其范围分别为 105 至 318、36 至 1477、215 至 316 和 9 至 49。在 PRE 试验中，施用的除草剂包括 5 至 9 种剂量的福美双（1X=210 克活性成分-公顷-1）、氟乐灵（1X=57 克活性成分-公顷-1）、氧乐果（1X=561 克活性成分-公顷-1）和三氟嘧啶（1X=38 克活性成分-公顷-1）；对可疑种群的施用剂量为 0 至 6 倍，对易感种群的施用剂量为 0 至 2 倍。福美双的目测防治效果、死亡率和生物量 RRF 分别为 3 至 5、21 至 31、6 至 22 和 8 至 38。结果证实，佐治亚州的帕尔默苋种群对前期和后期施用的 PPO 抑制除草剂具有抗性。

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来源期刊

Weed Technology 农林科学-农艺学

CiteScore

2.90

自引率

21.40%

发文量

审稿时长

12-24 weeks

期刊介绍： Weed Technology publishes original research and scholarship in the form of peer-reviewed articles focused on understanding how weeds are managed. The journal focuses on: - Applied aspects concerning the management of weeds in agricultural systems - Herbicides used to manage undesired vegetation, weed biology and control - Weed/crop management systems - Reports of new weed problems -New technologies for weed management and special articles emphasizing technology transfer to improve weed control -Articles dealing with plant growth regulators and management of undesired plant growth may also be accepted, provided there is clear relevance to weed science technology, e.g., turfgrass or woody plant management along rights-of-way, vegetation management in forest, aquatic, or other non-crop situations. -Surveys, education, and extension topics related to weeds will also be considered