Effect of herbicide programs on control and seed production of multiple herbicide-resistant Palmer amaranth (Amaranthus palmeri) in corn resistant to 2,4-D/glufosinate/glyphosate

IF 1.3 3区农林科学 Q3 AGRONOMY

Weed Technology Pub Date : 2024-04-16 DOI:10.1017/wet.2024.23

Ramandeep Kaur, Rachel Rogers, Nevin C. Lawrence, Yeyin Shi, Parminder S. Chahal, Stevan Z. Knezevic, Amit J. Jhala

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引用次数: 0

Abstract

Multiple herbicide-resistant (MHR) Palmer amaranth is among the most problematic summer annual broadleaf weeds in Nebraska and several other states in the United States. A new multiple herbicide-resistant corn cultivar (2,4-D/glufosinate/glyphosate-resistant, also known as Enlist corn) has been commercially available in the United States since 2018. Growers are searching for herbicide programs for control and reducing seed production of MHR Palmer amaranth in Enlist corn. The objectives of this study were to evaluate herbicide programs applied preemergence (PRE), early-postemergence (EPOST), or PRE followed by (fb) late-POST (LPOST) for the management of MHR Palmer amaranth in Enlist corn and their effect on Palmer amaranth biomass, density, seed production, and corn yield. Field experiments were conducted near Carleton, Nebraska, in 2020 and 2021 in a grower’s field infested with acetolactate synthase-inhibitor/atrazine/glyphosate-resistant Palmer amaranth in Enlist corn. Herbicides applied PRE, such as flufenacet/isoxaflutole/thiencarbazone-methyl, acetochlor/clopyralid/flumetsulam, or acetochlor/clopyralid/mesotrione provided 75% to 99% control of Palmer amaranth 30 d after PRE (DA-PRE). PRE fb LPOST herbicides resulted in 94% Palmer amaranth control 90 DA-LPOST, reduced weed density to 0 to 8 plants m−2 30 DA-LPOST, and biomass to 2 to 14 g m−2 15 DA-LPOST compared to PRE-only (59% control, 0 to 15 plants m−2, and 4 to 123 g m−2) and EPOST-only herbicides (78% control, 6 to 30 plants m−2, and 8 to 25 g m−2). Based on contrast analysis, Palmer amaranth seed production was reduced to 14,050 seed m–2 in PRE fb LPOST herbicide programs compared with 325,490 seed m–2 in PRE-only and 376,750 seed m–2 in EPOST-only programs. Based on orthogonal contrast, higher corn yield of 12,340 and 11,730 kg ha−1 was obtained with PRE fb LPOST herbicide programs compared to PRE-only (10,840 and 11,510 kg ha−1) and EPOST-only programs (10,850 and 10,030 kg ha−1) in 2020 and 2021, respectively.

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除草剂程序对抗性 2,4-D/glufosinate/glyphosate 的玉米中多种抗性帕尔默苋（Amaranthus palmeri）的控制和种子产量的影响

耐多种除草剂（MHR）的帕尔默苋是内布拉斯加州和美国其他几个州最棘手的夏季一年生阔叶杂草之一。自 2018 年以来，一种新的抗多种除草剂玉米栽培品种（抗 2,4-D/草铵膦/草甘膦，又称 Enlist 玉米）已在美国上市。种植者正在寻找除草剂方案，以控制和减少Enlist玉米中MHR帕尔默苋的种子产量。本研究的目的是评估施用芽前（PRE）、早期芽后（EPOST）或PRE后（fb）晚期芽后（LPOST）的除草剂方案对Enlist玉米中MHR帕尔默苋的管理及其对帕尔默苋生物量、密度、种子产量和玉米产量的影响。2020 年和 2021 年，在内布拉斯加州卡尔顿附近进行了田间试验，在种植者的田地里，Enlist 玉米受到乙酰乳酸合成酶抑制剂/特拉津/草甘膦抗性帕尔默苋的侵扰。预除草剂，如氟苯乙酰胺/异噁唑禾草灵/甲基硫菌灵、乙草胺/氯吡嘧草酯/氟磺胺草醚或乙草胺/氯吡嘧草酯/甲霜灵，在预除草（DA-PRE）30 天后对帕尔默苋的控制率为 75% 至 99%。与仅使用预除草剂（控制率为 59%，0 至 15 株 m-2，4 至 123 克 m-2）和仅使用 EPOST 除草剂（控制率为 78%，6 至 30 株 m-2，8 至 25 克 m-2）相比，预除草剂与 LPOST 除草剂可在 90 DA-LPOST 后使帕尔默苋的控制率达到 94%，杂草密度在 30 DA-LPOST 后降至 0 至 8 株 m-2，生物量在 15 DA-LPOST 后降至 2 至 14 克 m-2。根据对比分析，在 PRE fb LPOST 除草剂方案中，帕尔默苋种子产量减少到 14,050 种子 m-2，而在纯 PRE 和纯 EPOST 方案中，种子产量分别为 325,490 种子 m-2 和 376,750 种子 m-2。根据正交对比，2020 年和 2021 年，使用 PRE fb LPOST 除草剂方案的玉米产量分别为每公顷 12,340 公斤和 11,730 公斤，而使用纯 PRE 方案（每公顷 10,840 公斤和 11,510 公斤）和纯 EPOST 方案（每公顷 10,850 公斤和 10,030 公斤）的玉米产量分别为每公顷 12,340 公斤和 11,730 公斤。

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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