Rhizoma perennial peanut (RPP) is well adapted to the Gulf Coast region of the United States, but its varietal tolerance to glyphosate and triclopyr is not well defined. The research was conducted to determine the effect of various rates of glyphosate and triclopyr on established RPP, and the response of common RPP varieties to these herbicides. The RPP sward was approximately 7 yr younger at Zolfo Springs than at the Ona location. RPP showed moderate tolerance to glyphosate and triclopyr application, and injury level did not differ with the age of RPP sward. However, biomass production was negatively influenced by the age of the RPP sward. Overall, injury from glyphosate applications did not exceed 40% at either site. The glyphosate rate for 20% biomass reduction was predicted to be 0.53 and 2.17 kg ae ha−1 at Zolfo Springs and Ona, respectively. RPP injury from triclopyr was greater at the Zolfo Springs location than at Ona, and the triclopyr rate predicted to result in a 20% biomass reduction was 0.45 and 0.99 kg ae ha−1 at the Zolfo Springs and Ona locations, respectively. There was a difference on RPP varieties response to glyphosate and triclopyr application. ‘Florigraze’ and ‘Ona 33’ were less tolerant to glyphosate compared to ‘UF-Tito’ and ‘Ecoturf’ at 30 d after treatment. Likewise, UF-Tito and Florigraze were less tolerant to triclopyr compared to Ona 33 and Ecoturf. Overall, Florigraze showed highest injury and at least 2-fold reduction on biomass compared to the other three varieties from glyphosate or triclopyr application. Results from this research indicate that glyphosate and triclopyr appear to be safe to apply to long-established RPP stands, but herbicide rate and RPP varieties should be considered if stands are <5 yr old.

中文翻译：

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多年生花生对草甘膦和绿草定的耐受性

多年生花生 (RPP) 很好地适应了美国墨西哥湾沿岸地区，但其品种对草甘膦和绿草定的耐受性尚不明确。该研究旨在确定草甘膦和绿草定的不同比例对已建立的 RPP 的影响，以及常见 RPP 品种对这些除草剂的反应。Zolfo Springs 的 RPP sward 比 Ona 地点年轻约 7 岁。RPP对草甘膦和绿草定的应用表现出中等耐受性，并且伤害程度不随RPP草的年龄而变化。然而，生物质产量受到 RPP sward 年龄的负面影响。总体而言，草甘膦应用造成的伤害在任一地点均未超过 40%。生物量减少 20% 的草甘膦用量预计为 0.53 和 2.17 kg ae ha-1分别在 Zolfo Springs 和 Ona。绿草定对 RPP 的伤害在 Zolfo Springs 位置比在 Ona 更大，预计导致 20% 生物量减少的绿草定率分别为 0.45 和 0.99 kg ae ha-1分别在 Zolfo Springs 和 Ona 地点。RPP品种对草甘膦和绿草定施用的反应存在差异。在处理后 30 天，与“UF-Tito”和“Ecoturf”相比，“Florigraze”和“Ona 33”对草甘膦的耐受性较低。同样，与 Ona 33 和 Ecoturf 相比，UF-Tito 和 Florigraze 对绿草定的耐受性较低。总体而言，与使用草甘膦或绿草定的其他三个品种相比，Florigraze 表现出最高的伤害和至少 2 倍的生物量减少。这项研究的结果表明，草甘膦和绿草定似乎可以安全地应用于长期建立的 RPP 林分，但如果林分小于 5 年，则应考虑除草剂用量和 RPP 品种。