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Title: EFFECT OF DRIFT CONTROL ADJUVANTS WITH ROUNDUP ULTRA

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

Submitted to: Proceedings of Southern Weed Science Society
Publication Type: Abstract Only
Publication Acceptance Date: 1/28/2001
Publication Date: 1/28/2001
Citation: Hanks, J.E., Garr, J.A., Wills, G.D. 2001. Effect of drift control adjuvants with roundup ultra. Proceedings of Southern Weed Science Society. 54:193.

Interpretive Summary: Not available.

Technical Abstract: Preliminary studies were conducted at Stoneville, MS to determine the effect of drift retardant polymers on spray droplet size, spray patterns and efficacy when used with Roundup Ultra. Array, Spray Start and Control were the three commercially available adjuvants and GP D1 was the one experimental polymer evaluated. A Malvern laser particle analyzer was used dto determine the DV.5 and percent spray volume in droplets <144 microns. All treatments provided excellent control of velvetleaf with only the Roundup Ultra with no additional adjuvant being significantly lower than all other treatments. There were no significant differences among treatments with any type additional adjuvant, including the addition of only AMS to Roundup Ultra. Since all treatments included AMS except for the one treatment with Roundup Ultra alone, indications are that the addition of AMS had more effect on velvetleaf control than addition of the drift retardant adjuvants. The only drastically distorted spray patterns were with the three commercially available products used at higher rates. Very little distortion occurred with the remaining mixtures. Spray droplet analyses indicated all drift retardant adjuvants increased the DV.5 and reduced the percentage of spray volume in droplets <144 microns. Increased rates of each further reduced the percentage of spray volume in droplets <144 microns, but with distorted spray patterns for the three commercially available products. For the four adjuvants tested at the lower rates, the percentage of spray volume in droplets <144 microns ranged from 16% to 22%, as compared to water at 28%. Roundup Ultra and Roundup Ultra with AMS added produced droplets similar to water.