Postemergence-directed applications of pendimethalin for control of early-season weeds in chile pepper

IF 1.3 3区农林科学 Q3 AGRONOMY

Weed Technology Pub Date : 2023-12-22 DOI:10.1017/wet.2023.91

Akash Bajagain, E. Lehnhoff, Robert Steiner, Rebecca Creamer, Brian J. Schutte

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引用次数: 0

Abstract

In New Mexico chile pepper production, pendimethalin is traditionally applied shortly after crop thinning, which is 9 to 10 wk after crop seeding. Pendimethalin applications before crop thinning may be a method for controlling early-season weeds in chile pepper; however, chile pepper tolerance to early-season applications of pendimethalin is poorly understood. We conducted a greenhouse study to evaluate young chile pepper responses to pendimethalin. We also conducted a field study to determine weed and chile pepper responses to early-season, postemergence-directed (POST-directed) pendimethalin in combination with herbicides registered for preemergence (PRE) applications. The greenhouse study included three treatments administered when chile pepper was at the 4-leaf stage: 1) pendimethalin applied to foliage and soil, 2) pendimethalin applied soil only, and 3) a non-treated control. The field study included four treatments: 1) PRE applications of napropamide followed by POST-directed pendimethalin at 5 wk after crop seeding, 2) PRE applications of clomazone followed by POST-directed pendimethalin at 5 wk after crop seeding, 3) POST-directed pendimethalin without PRE herbicides, and 4) non-treated, weed-free control. We conducted the field study at two sites that differed in soil texture. Pendimethalin application rates were maximum labelled rates for the specific soil. Results from the greenhouse study indicated that pendimethalin applied to foliage and soil stunted two of five cultivars, whereas pendimethalin applied to soil did not affect chile pepper height, fresh weight, dry weight, and root area. Results from the field study indicated POST-directed pendimethalin did not affect chile pepper height or fruit yield, or cause visual symptoms of herbicide injury. POST-directed pendimethalin reduced the densities of weeds, including junglerice. The results of this study indicate that POST-directed applications of pendimethalin at 5 wk after crop seeding do not cause crop injury or yield loss, while providing some weed control benefits, in chile pepper.

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苗后定向施用戊唑醇控制辣椒中的早季杂草

在新墨西哥州的辣椒生产中，传统上是在作物稀植后不久，即作物播种后 9 到 10 周施用戊唑醇。在作物疏苗前施用戊唑醇可能是控制辣椒早季杂草的一种方法；但是，人们对辣椒对早季施用戊唑醇的耐受性知之甚少。我们进行了一项温室研究，以评估幼嫩辣椒对戊唑醇的反应。我们还进行了一项田间研究，以确定杂草和辣椒对早季、芽后定向（POST-directed）戊唑醇与登记用于芽前（PRE）施用的除草剂的反应。温室研究包括在辣椒 4 叶期施用的三种处理：1）在叶片和土壤中施用戊唑醇；2）仅在土壤中施用戊唑醇；3）未施药对照。实地研究包括四种处理方法：1) 在作物播种后 5 周前施用萘草胺，然后在作物播种后 5 周后直接施用戊唑醇；2) 在作物播种后 5 周前施用氯马隆，然后在作物播种后 5 周后直接施用戊唑醇；3) 在作物播种后直接施用戊唑醇，不施用前除草剂；4) 不施用除草剂的无杂草对照。我们在两个土壤质地不同的地点进行了实地研究。嘧霉胺的施用量是特定土壤的最大标签施用量。温室研究结果表明，在叶面和土壤中施用戊唑醇会使五个栽培品种中的两个品种生长不良，而在土壤中施用戊唑醇不会影响辣椒的高度、鲜重、干重和根部面积。田间研究结果表明，后期定向施用的戊唑醇不会影响辣椒的高度或果实产量，也不会造成除草剂伤害的视觉症状。后效烯啶虫胺降低了杂草的密度，包括蔺草。该研究结果表明，在辣椒播种后 5 周施用戊唑醇不会对作物造成伤害或导致减产，同时还具有一定的除草效果。

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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