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Potato (Solanum tuberosum) Response to Simulated Drift of Imidazolinone Herbicides

  • Charlotte V. Eberlein (a1) and Mary J. Guttieri (a1)

Abstract

Potato response to simulated drift of imazamethabenz, imazethapyr, or imazapyr was evaluated in field studies conducted near Aberdeen, ID, in 1989 and 1990. Herbicides were applied at rates corresponding to 0.02, 0.1, and 0.5 times the typical use rate (x rate) of each herbicide. Simulated drift treatments were applied at potato emergence, tuber initiation, or tuber bulking. Foliar injury symptoms varied with herbicide, rate, and potato growth stage at the time of application, but were generally most severe with imazapyr and least severe with imazamethabenz. Yield losses also varied with herbicide, rate, and potato growth stage at the time of application, but generally were greater when drift occurred at tuber initiation or tuber bulking than at potato emergence. Losses in U.S. Number 1 (highest quality) yield were greater than losses in total yield, indicating that tuber quality was affected more by the herbicides than was tuber biomass accumulation. U.S. Number 1 yield was not reduced by simulated drift of imazamethabenz at 0.02x but was reduced 25% by the 0.1x rate applied at tuber bulking. At the 0.5x rate, U.S. Number 1 yield was reduced 36, 85, or 92% when drift occurred at potato emergence, tuber initiation, or tuber bulking, respectively. For imazethapyr, U.S. Number 1 yield losses ranged from 0 to 68% for the 0.02x rate; 19 to 98% for the 0.lx rate; and 64 to 100% with the 0.5x rate, depending on potato growth stage at the time of application. Losses were least when drift occurred at potato emergence. Simulated drift of imazapyr at the 0.02x rate applied as potatoes were emerging reduced U.S. Number 1 yield 79%. All other imazapyr treatments caused ≥99% loss in U.S. Number 1 yield.

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References

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1. Bode, L. E. 1984. Downwind drift deposits by ground applications. Pages 4952 in Proc. Pesticide Drift Manage. Symp.
2. Lawson, H. M. and Wiseman, J. S. 1991. The effects of contamination of a potato crop with a thifensulfuron-methyl/metsulfuron methyl herbicide. Pages 239246 in Proc. 1991 Br. Crop Prot. Conf.
3. Little, D. L. and Shaner, D. L. 1991. Absorption and translocation of the imidazolinone herbicides. Pages 5369 in Shaner, D. L. and O'Conner, S. L., eds. The Imidazolinone Herbicides. CRC Press, Boca Raton, FL.
4. Stidham, M. A. and Singh, B. K. 1991. Imidazolinone acetohydroxy acid synthase interactions. Pages 7190 in Shaner, D. L. and O'Conner, S. L., eds. The Imidazolinone Herbicides. CRC Press, Boca Raton, FL.
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6. Westra, P., Franc, G., Cramner, B., and D'Amato, T. 1991. Research report on 1988 potato-herbicide injury research. Pages 98104 in Fletcher, J. and Ratsch, H., eds. Plant Tier Testing: A Workshop to Evaluate Nontarget Plant Testing in Subdivision J Pesticide Guidelines. U.S. Environmental Prot. Agency, Corvallis.

Keywords

Potato (Solanum tuberosum) Response to Simulated Drift of Imidazolinone Herbicides

  • Charlotte V. Eberlein (a1) and Mary J. Guttieri (a1)

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