Saflufenacil efficacy on horseweed and its interaction with glyphosate

Saflufenacil is a new herbicide on the market and its effectiveness on horseweed, several populations of which have evolved resistance to glyphosate, is not clear. In this research, the effect of adjuvants on the control of horseweed with saflufenacil in the field, the effect of the interaction between glyphosate and saflufenacil on glyphosate‐resistant and glyphosate‐susceptible horseweed and the patterns of uptake and translocation of glyphosate applied alone and in combination with saflufenacil in horseweed were evaluated. The addition of methylated seed oil to saflufenacil provided the best control of horseweed, with crop oil concentrate being intermediate in effect and non‐ionic surfactant ranking as the least‐effective adjuvant. The interaction between glyphosate and saflufenacil was additive with regards to the control of glyposate‐resistant horseweed. The glyphosate‐susceptible horseweed population absorbed 6–13% more ¹⁴C‐glyphosate than the glyphosate‐resistant population. The addition of saflufenacil reduced ¹⁴C‐glyphosate translocation in both the glyphosate‐resistant and the glyphosate‐susceptible horseweed populations by at least 6%; however, due to the exceptional efficacy of saflufenacil, these reductions did not reduce the level of control. Saflufenacil holds great potential as an alternative control option for glyphosate‐resistant horseweed and is a valuable tool in the management of resistant weeds.     

苯嘧磺草胺原药高效液相色谱分析方法研究

本文采用高效液相色谱法,以甲醇+磷酸溶液为流动相,使用以ZORBAX Extend-C18、5μm为填料的不锈钢柱和二极管阵列检测器,在270nm波长下对苯嘧磺草胺原药进行分离和定量分析。结果表明,该分析方法的线性相关系数为1.000 0;标准偏差为0.21;变异系数为0.22%;平均回收率为99.4%。