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Title: Effect of Two Polysaccharide Adjuvants on Glyphosate Spray Droplet Size and Efficacy

Author
item JONES, E. - MSU-DREC
item Hanks, James
item WILLS, G. - MSU-DREC
item MACK, R. - HELENA CHEMICAL

Submitted to: Weed Technology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 6/30/2006
Publication Date: 3/30/2007
Citation: Jones, E.J., Hanks, J.E., Wills, G.D., Mack, R.E. 2007. Effect of Two Polysaccharide Adjuvants on Glyphosate Spray Droplet Size and Efficacy. Weed Technology, pp. 171-174.

Interpretive Summary: Laboratory and field studies were conducted to investigate the effects of two experimental drift control adjuvants on the potential for drift reduction and on the efficacy of spray solutions of glyphosate herbicide formulated without surfactant when used with conventional flat fan and air-induction type spray nozzles. Droplet spectra were examined using a Malvern laser spray droplet analyzer. The addition of the drift control adjuvants HM 2005B and HM 9752 to the glyphosate spray mixtures each resulted in a reduction in the percentage of the spray volume in fine droplets < 141 'm and an increase in the VMD of the spray droplets with each adjuvant and nozzle type. The addition of the drift control adjuvants HM 2005B and HM 9752 either had no effect or slightly increased the efficacy of glyphosate over all plant species in this study in each of the 2 years.

Technical Abstract: Laboratory and field studies were conducted to determine the effect of the adjuvants HM 9752 and HM 2005B on the efficacy and droplet spectra of spray solutions of glyphosate formulated without surfactant using the conventional elliptical-orifice flat fan and the venturi-type drift-reduction spray nozzles. Droplet spectra were examined using a Malvern laser spray droplet analyzer. Glyphosate efficacy was increased and the volume of the smaller diameter spray droplets was decreased with each adjuvant. These adjuvants could prove useful for enhancing glyphosate weed control and for providing management in potential drift situations.