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Control and Carbohydrate Reserves of Quackgrass as Influenced by Uracil Herbicides

  • C. W. Swann (a1) and K. P. Buchholtz (a2)

Abstract

Plots in dense quackgrass (Agropyron repens) sods were treated with 5-bromo-3-isopropyl-6-methyl uracil (isocil) or 5-bromo-3-sec-butyl-6-methyl uracil (bromacil) at rates of 0.5 to 4.0 lb/A in the fall or in the early spring and then planted to corn. Quackgrass was virtually eliminated by all rates but 0.5 lb/A. Corn was severely injured on plots treated at 2 lb/A but made fair growth at rates of 1.0 lb/A or less. The year following corn, soil residues of isocil were more toxic to oats than those of bromacil. Carbohydrate analyses of rhizomes from treated plots indicated that depletion of carbohydrate reserves contributed to the elimination of the quackgrass.

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References

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1. Buchholtz, K. P. 1963. Use of atrazine and other triazine herbicides in control of quackgrass in corn fields. Weeds 11:202205.
2. Heinze, P. H. and Murneek, A. E. 1940. Comparative accuracy and efficiency in the determination of carbohydrates in plant material. Missouri Agr. Exp. Sta. Res. Bull. 314.
3. Hilton, J. L., Monaco, T. J., Moreland, D. E., and Gentner, W. A. 1964. Mode of action of substituted uracil herbicides. Weeds 12:129131.
4. Smith, D., Paulsen, G. M., and Raguse, C. A. 1964. Extraction of total available carbohydrates from grass and legume tissue. Plant Physiol. 39:960962.

Control and Carbohydrate Reserves of Quackgrass as Influenced by Uracil Herbicides

  • C. W. Swann (a1) and K. P. Buchholtz (a2)

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