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Effect of Environment and Adjuvants on Asulam Phytotoxicity

Published online by Cambridge University Press:  12 June 2017

John D. Nalewaja
Affiliation:
Prof. and Foreign Exchange Sci., Agron. Dep., North Dakota State Univ., Fargo, ND, and Akademia Rolnicza, ul. Mazowiecka 45/46, 60-623 Poznan 31, Poland
Zenon Woznica
Affiliation:
Prof. and Foreign Exchange Sci., Agron. Dep., North Dakota State Univ., Fargo, ND, and Akademia Rolnicza, ul. Mazowiecka 45/46, 60-623 Poznan 31, Poland

Abstract

Experiments were conducted to determine the influence of various factors on asulam {methyl[(4-aminophenyl)sulfonyl] carbamate} toxicity to flax (Linum usitatissimum L.) and wild oats (Avena fatua L. # AVEFA). Asulam toxicity to both flax and wild oats generally increased as temperature, humidity, and soil moisture increased after treatment. Octoxynol {α-[p-1,1,3,3-tetramethyl butyl phenyl]-ω-hydroxypoly(oxyethylene)} in the spray solution increased asulam toxicity to both species in all environments. Octoxynol and trimethylenonypolyethoxyethanol (WK) enhanced asulam toxicity more than other adjuvants evaluated. Asulam toxicity to both flax and wild oats increased as octoxynol concentration in the spray increased. Flax tolerance to asulam generally increased with flax height at treatment. ‘Flor’ flax was the most asulam susceptible of six cultivars evaluated. A 2-mm simulated rainfall within 3 or 6 h after asulam treatment reduced toxicity to wild oats and flax, respectively.

Type
Weed Control and Herbicide Technology
Copyright
Copyright © 1988 by the Weed Science Society of America 

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References

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