Linear alcohol ethoxylates affect gl yphosate and fluazifop-p deposits

摘要

Scanning electron micrographs were taken of spray droplet residues from glyphosate (Honcho~circleR) and fluazifop-P (Fusilade 2000~circleR) applied with linear alcohol ethoxylates (LAE) hving linear alcohol chains with C_(8-10), C_(12-14), and C_(16-18) and ethylene oxides (EO) at 40-46, 60-62, and 80percent of surfactant molecular weight. Glyphosate spray applied with high HLB, 80percent EO, LAE gave a uniform thick deposit. LAE which formed these distinct deposits with close contact to the leaf related to previously reported high glyphosate phytotoxicity to wheat. Fluazifop-P spray residual characteristics did not relate closely to efficacy. However, LAE that gave more uniform deposits were associated with the greatest fluazifop-P phytotoxicity. Fluazifop-P formulants may have reduced the LAE effect on spray droplet deposit. Glyphosate was a formulation without surfactant. Generally, fluazifop-P residuals were almost not discernable when applied with LAE C_(8-10) and C_(12-14) with 40-46percent EO, the least effective LAE for enhancement of fluazifop-P phytotoxicity to wheat. Surfactant affect on spray droplet deposit in addition to previously reported solubility characteristics appear important to enhancement of glyphosate and fluzifop-P phytotoxicity