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Nozzle, Spray Volume, and Adjuvant Effects on Carfentrazone and Imazamox Efficacy

Published online by Cambridge University Press:  20 January 2017

Bradford K. Ramsdale  and
Calvin G. Messersmith
Bradford K. Ramsdale*
Affiliation:
Department of Plant Sciences, North Dakota State University, Fargo, ND 58105
Calvin G. Messersmith
Affiliation:
Department of Plant Sciences, North Dakota State University, Fargo, ND 58105
*
Corresponding author's E-mail: [email protected].
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Abstract

Field experiments were conducted to determine the influence of nozzle type, spray volume, and adjuvants on herbicide efficacy. Carfentrazone and imazamox, representing contact and translocated herbicides, respectively, were equally or more effective when applied with drift-reducing TurboDrop or Drift Guard nozzles than the conventional flat-fan nozzle in 95% of the comparisons. Imazamox was equally effective when applied in 47, 94, or 190 L/ha spray volume, regardless of nozzle type or adjuvant. Carfentrazone applied in 47 L/ha spray volume controlled flax and sunflower as well as in 94 or 190 L/ha, provided urea ammonium nitrate fertilizer and either nonionic surfactant or methylated vegetable oil were included in the spray mixture. Conversely, carfentrazone with only urea ammonium nitrate was less effective when applied in 47 than in 94 or 190 L/ha spray volume. Carfentrazone and imazamox applied in low spray volumes (47 L/ha) gave consistent control when an effective adjuvant was included in the spray mixture.

Keywords

Carfentrazoneimazamoxflax, Linum usitatissimum L.sunflower, Helianthus annuus L.Application methodsdroplet sizenitrogen fertilizerspray coveragespray driftDAT, days after treatmentMVO, methylated vegetable oil, NIS, nonionic surfactantUAN, urea ammonium nitrate fertilizerVMD, volume median diameter
Type
Research
Information
Weed Technology , Volume 15 , Issue 3 , September 2001 , pp. 485 - 491
Copyright
Copyright © Weed Science Society of America 

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