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Title: EFFECTS OF DRIFT CONTROL ADJUVANTS ON EFFICACY AND SPRAY PATTERNS OF ROUNDUP D-PAK AND ROUNDUP WEATHER MAX APPLIED WITH AIR INDUCTION SPRAY NOZZLES

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

Submitted to: Proceedings of Southern Weed Science Society
Publication Type: Abstract Only
Publication Acceptance Date: 1/23/2004
Publication Date: 2/15/2004
Citation: Wills, G.D., Hanks, J.E., Jones, E.J., Mack, R.E. 2004. Effects of drift control adjuvants on efficacy and spray patterns of roundup d-pak and roundup weather max applied with air induction spray nozzles. Proceedings of Southern Weed Science Society. 57:274-275

Interpretive Summary: Abstract, summary not required.

Technical Abstract: Studies were conducted to determine the effects of the experimental drift control adjuvants HM 9752, HM 2005B, and HM 2006 on spray patterns and efficacy of glyphosate applied without surfactant as Roundup D-Pak® and with surfactant as Roundup Weather Max® using Spraying Systems Air Induction (AI) nozzles. Efficacy was evaluated by applying mixtures of both glyphosate products over-the-top to non-Roundup Ready® soybeans, barnyardgrass, pitted morningglory, and velvetleaf with a tractor-mounted sprayer at a rate of 0.45 kg ai/ha in a spray volume of 94 L/ha. Treatments were replicated four times in a randomized complete block design. Spray patterns were determined by using a single nozzle centered in a stationary position at 5.1 cm above a slanted sheet of corrugated metal. Spray mixtures were applied in 600-ml volumes to the sheet of corrugated metal with troughs spaced 6.4 cm apart and the discharge was collected in 100-ml graduated cylinders. The values for the average milliliter volumes of three replications as collected at each position from left to right were reversed right to left, added together and averaged again for each position to show a symmetrical spray pattern for each mixture. Percent control over all plant species at 2 WAT ranged from 70% with D-Pak applied with no drift control adjuvant to > 95% with all experimental drift control adjuvants when applied with either glyphosate formulation. Spray pattern results showed that although the width of spray patterns were slightly reduced with the drift control adjuvants there were no adverse effects on efficacy when used with these glyphosate formulations.