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Effect of Adjuvants and Urea Ammonium Nitrate on Bispyribac Efficacy, Absorption, and Translocation in Barnyardgrass (Echinochloa crus-galli). I. Efficacy, Rainfastness, and Soil Moisture

  • Clifford H. Koger (a1), Darrin M. Dodds (a2) and Daniel B. Reynolds (a2)
Abstract

Bispyribac is registered for postemergence control of broadleaf, sedge, and grass weeds in rice. Bispyribac inhibits the acetolactate synthase enzyme in sensitive plants. Herbicides in this class of chemistry require a spray adjuvant to achieve optimal efficacy, often achieve different levels of weed control according to the spray adjuvant used, and typically have rainfast periods of at least 6 to 8 h. Efficacy and rainfastness of bispyribac can be affected by spray adjuvant and the addition of urea ammonium nitrate (UAN). Greenhouse experiments were conducted to investigate the effect of spray adjuvant type, addition of UAN, and soil moisture on bispyribac efficacy on barnyardgrass. Control of barnyardgrass was improved when UAN was added to bispyribac at 0.4 or 0.8 g ha−1 plus an organosilicone-based nonionic surfactant (OSL/NIS) or methylated seed oil/organosilicone (MSO/OSL) spray adjuvant. The type of adjuvant added to the spray solution affected bispyribac efficacy on barnyardgrass. The addition of UAN decreased the rainfast period from 8 h (registered rainfast period) to 1 or 4 h (99 to 100% control) when either the OSL/NIS or MSO/OSL adjuvant was applied with bispyribac, respectively. Applying UAN and OSL/NIS or MSO/OSL adjuvant with bispyribac enhanced efficacy and reduced the time period required between bispyribac application and washoff during a rainfall event. Increasing soil moisture conditions resulted in greater efficacy from bispyribac when applied with and without UAN.

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Corresponding author's E-mail: tkoger@drec.msstate.edu
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R. J. Field and N. C. Bishop 1988. Promotion of stomatal infiltration of glyphosate by an organosilicone surfactant reduces the critical rainfall period. Pestic. Sci. 24:5562.

C. H. Koger , D. H. Poston , and K. N. Reddy 2004. Effect of glyphosate spray coverage on control of pitted morningglory (Ipomoea lacunosa). Weed Technol. 18:24130.

M. S. McIntosh 1983. Analysis of combined experiments. Agron. J. 75:153155.

B. L. Olson , K. Al-Khatib , P. Stahlman , and P. J. Isakson 2000. Efficacy and metabolism of MON 37500 in Triticum aestivum and weedy grass species as affected by temperature and soil moisture. Weed Sci. 48:541548.

S. Tan , R. R. Evans , M. L. Dahmer , B. K. Singh , and D. L. Shaner 2005. Imidazolinone-tolerant crops: history, current status and future. Pest Manag. Sci. 61:246257.

S. Tanpipat , S. W. Adkins , J. T. Swarbrick , and M. Boersma 1997. Influence of selected environmental factors on glyphosate efficacy when applied to awnless barnyard grass [Echinochloa colona (L.) Link]. Aust. J. Agric. Res. 48:695702.

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Weed Science
  • ISSN: 0043-1745
  • EISSN: 1550-2759
  • URL: /core/journals/weed-science
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