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ARS Home » Southeast Area » Auburn, Alabama » Soil Dynamics Research » Research » Publications at this Location » Publication #352424
Title: Evaluation of Runner-Type Peanut Cultivar Tolerance to Paraquat Tank Mixes

Author
item PRICE, KATILYN - Auburn University
item XIAO, LI - Auburn University
item Price, Andrew
item MCELROY, SCOTT - Auburn University
item CHEN, CHARLES - Auburn University

Submitted to: Peanut Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 6/1/2020
Publication Date: N/A
Citation: N/A

Interpretive Summary: Tank-mixes are often used to reduce peanut injury caused by paraquat and broaden the spectrum of postemergence weed control. The objective of this study was to evaluate the tolerance of newer peanut cultivars to paraquat based tank mixes and determine if plant growth and yield can be negatively affected by these treatments. At 3-4 weeks after planting, paraquat was applied alone at three rates and in six different herbicide tank combinations. Data indicates peanut growth stunting may be observed following applications of paraquat tank mixes evaluated in this study, but it is unlikely that these negative effects can frequently lead to significant yield loss at the end of growing season.

Technical Abstract: Tank-mixes are often used to reduce peanut injury caused by paraquat and broaden the spectrum of postemergence weed control. However, new peanut cultivars with different growth characteristics were not sufficiently evaluated for tolerance to paraquat based herbicide programs. The objective of this study was to evaluate the tolerance of newer peanut cultivars to paraquat based tank mixes and determine if plant growth and yield can be negatively affected by these treatments. Experiments were conducted at Macon, Henry and Baldwin County AL in 2016 and 2017. Four peanut cultivars evaluated were Georgia 06G, Georgia 12Y, Georgia 14N, and TufRunner 511. At 3-4 weeks after planting, paraquat was applied alone (210, 280, 420 g ai ha-1) and in six different tank combinations with bentazon + acifluorfen, S-metolachlor, pyroxasulfone, acetochlor, pyroxasulfone + carfentrazone, or 2,4-DB at the highest labeled rate. There was no significant difference between the cultivars for all of the growth parameters evaluated as they responded similarly to treatments evaluated in this study. The most significant height reductions (p=0.05) observed were with paraquat 420 g ai ha-1 at 5-20% across all locations. Paraquat 280 g ai ha-1, S-metolachlor plus 2,4-DB, and S-metolachlor plus bentazon plus acifluorfen had significantly reduced canopy widths over all locations at 22-30%, 12-22%, and 20-37% respectively at 45-48 DAP. Significant yield losses were only observed in 2016 for paraquat plus benzaton plus acifluorfen plus pyroxasulfone in Macon County (15%), paraquat + benzaton + acifluorfen + pyroxasulfone + carfentrazone in Henry County (13%), and paraquat 280 g ai ha-1 at Baldwin County (7%), as compared to non-treated check. Data indicates peanut growth stunting may be observed following applications of paraquat tank mixes evaluated in this study, but it is unlikely that these negative effects can frequently lead to significant yield loss at the end of growing season.