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ARS Home » Research » Publications at this Location » Publication #131738
Title: EFFECTS OF COMMERCIAL DRIFT CONTROL ADJUVANTS ON DROPLET SIZE, EFFICACY ANDSPRAY PATTERN WITH ROUNDUP ULTRA

Author
item GARR, J - GARRCO PRODUCTS,INC.
item Hanks, James
item WILLS, G - DREC

Submitted to: Proceedings of Southern Weed Science Society
Publication Type: Abstract Only
Publication Acceptance Date: 1/25/2002
Publication Date: 1/25/2002
Citation: Garr, J.A., Hanks, J.E., Wills, G.D. 2002. Effects of commercial drift control adjuvants on droplet size, efficacy andspray pattern with roundup ultra. Proceedings of Southern Weed Science Society. 55:183-184.

Interpretive Summary: Abstract, none required.

Technical Abstract: Studies were conducted at Stoneville, MS to investigate the effects of one experimental and six commercially available drift control polymers on spray droplet size, spray pattern and efficacy of velvetleaf (theophrasti Medicus) when applied with Roundup Ultra and ammonium sulfate. A Malvern laser particle analyzer was used to determine DV.5 and percent spray volume ein droplets <144 microns. A commercial patternator with corrugations 5 cm apart was used to evaluate spray patterns. Field plots consisted of four rows spaced 1-m apart by 12-m long planted with conventional soybeans and eight rows of velvetleaf (theophrasti Medicus) planted perpendicular to the soybeans in rows spaced 1-m apart. DV.5 and percent spray volume in droplets <144 microns was basically the same for solutions without drift control polymer added, but DV.5 was increased and percent spray volume in droplets <144 microns was decreased with all polymers. DV.5 ranged from 205 microns without polymer to 487 microns with polymer and the percent spray volume in droplets <144 microns ranged from 29.4% without polymer to 7.0% with polymer. This indicated a significant reduction in the drift potential when drift control polymers are used. The spray pattern was distorted for two of the solutions with drift control polymers, but efficacy was unaffected with these two polymers. Efficacy ranged from 80% to 96%. Roundup Ultra without any additive resulted in the lowest control and was significantly lower than Roundup Ultra with ammonium sulfate only, indicating the ammonium sulfate was providing the additional control rather than the addition of drift control polymers. The addition of drift control polymers did significantly reduce the potential for drift.