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6 November 2023 Growth and yield response of peanut to simulated drift of glufosinate at vegetative and reproductive growth stages
Olumide S. Daramola, Navjot Singh, Joseph E. Iboyi, Pratap Devkota
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Abstract

The increased incidence of glyphosate-resistant weeds has led to an exponential increase in the use of glufosinate on glufosinate-resistant corn, cotton, and soybean crops. Field experiments were conducted in 2021 and 2022 to evaluate peanut response to glufosinate at 25 and 60 d after planting, corresponding to vegetative (V3) and reproductive (R4) growth stages, at 1.2, 4.7, 18.9, 75.5, and 302 g ai ha-1 representing 1/514 to 1/2 of the labeled rate of 604 g ha-1. Peanut injury and canopy and yield reductions from glufosinate were <10% when applied at 1.2, 4.7, and 18.9 g ha-1. However, at 75.5 and 302 g ha-1 peanut injury ranged from 24% to 72% at the V3 exposure timing and 33% to 54% at the R4 exposure timing. Similarly, glufosinate applied at 75.5 and 302 g ha-1 reduced peanut canopy width by 10% to 23% at the V3 exposure timing and by 43% to 57% at the R4 exposure timing. Averaged across exposure timing, peanut yield was reduced by 15% and 61% when glufosinate was applied at 75.5 and 302 g ha-1, respectively. Averaged across rates, peanut yield reduction was 18% at the V3 exposure timing, with glufosinate at 298 g ha-1 required to cause an estimated 50% reduction in yield. Peanut yield was reduced by 20% when glufosinate was applied at the R3 peanut growth stage, whereas glufosinate applied at 243 g ha-1 caused an estimated 50% reduction in yield. There was no difference in normalized difference vegetative index (NDVI) values between untreated plants and peanut exposed to glufosinate at 1.2, 4.7, and 18.9 g ha-1. However, peanut exposed to glufosinate at 75.5 and 302 g ha-1 was distinguished from untreated plants with lower NDVI values. Based on the Pearson correlation coefficient, the best timing for assessing potential yield reduction based on injury was between 2 and 4 wk after treatment.

Nomenclature: Glufosinate; peanut, Arachis hypogaea L.

Olumide S. Daramola, Navjot Singh, Joseph E. Iboyi, and Pratap Devkota "Growth and yield response of peanut to simulated drift of glufosinate at vegetative and reproductive growth stages," Weed Technology 37(6), 637-644, (6 November 2023). https://doi.org/10.1017/wet.2023.81
Received: 29 July 2023; Accepted: 20 October 2023; Published: 6 November 2023
KEYWORDS
herbicide drift
normalized difference vegetation index
off-target injury
peanut yield reduction
Unmanned aerial vehicle (UAV)
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