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Effects of 2,4-D and Dalapon on Weed Seed Production and Dormancy

  • R. S. Fawcett (a1) and F. W. Slife (a2)

2,4-D [(2,4-dichlorophenoxy)acetie acid] and dalapon (2,2-dichloropropionic acid) were applied to a natural stand of annual weeds at a time near flowering to determine effects on seed production and the dormancy and viability of seeds produced. At rates of 0.6 and 1.1 kg/ha, 2,4-D reduced, respectively the seed production of common lambsquarters (Chenopodium album L.) 99 and 99%, redroot pigweed (Amaranthus retroflexus L.) 77 and 84%, and jimsonweed (Datura stramonium L.) 64 and 100%, while giant foxtail (Setaria faberi Herrm) seed production was increased to 307 and 381% of the control, respectively. Dalapon at rates of 2.2 and 4.5 kg/ha reduced respectively seed production of giant foxtail 100 and 100%, and jimsonweed 100 and 91%. Before and after overwinter burial in the soil, common lambsquarters seeds from plants treated with 4.5 kg/ha dalapon were less dormant than control seeds. After overwintering, redroot pigweed seeds from dalapon-treated plants were less dormant than controls, and more seeds survived the winter burial. Common lambsquarters and redroot pigweed seeds from plants treated with 1.1 kg/ha 2,4-D were more dormant than control seeds before overwintering,’ while giant foxtail seeds from 2,4-D treated plants were less dormant than controls after overwintering. Viability of seeds produced by herbicide-treated plants, as determined by germination in KCN, was not greatly different from control seeds. Treatment with 2,4-D or dalapon resulted in the production of common lambsquarters seeds which produced seedlings about half as vigorous as controls. Jimsonweed seedlings grown from seeds from 2,4-D-treated plants showed phenoxy herbicide injury symptoms.

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1. Anderson, R. N. and Helgeson, E. A. 1954. Some effects of postemergence applications of dalapon to wild oats. Weeds 3:351358.
2. Anderson, R. N. and Helgeson, E. A. 1955. Growth of wild oats seedlings from parent plants treated with 2,2-dichloro propionic acid (dalapon). Res. Rep. North Cent. Weed Control Conf. 12:55.
3. Anderson, R. N. and Helgeson, E. A. 1958. Control of wild oats by prevention of normal seed development with sodium 2,2-dichloro-propionate. Weeds 6:263270.
4. Brenchly, W. E. and Warington, K. 1930. The weed seed populations of arable soil. I. Numerical estimations of viable seeds and observations on their natural dormancy. J. Ecol. 18:235272.
5. Carder, A. C. 1954. The selective control of wild oats in cereal crops by use of maleic hydrazide. Res. Rep. North Cent. Weed Control Conf. 11:50.
6. Evans, R. A., Kay, B. L., and McKell, C. M. 1963. Herbicides to prevent seed set or germination of medusahead. Weeds 11:273276.
7. Hill, E. R., Lachman, W. H., and Maynard, D. N. 1963. Translocation of amitrole in yellow nutsedge and its effect on seed germination. Weeds 11:165166.
8. King, L. J. 1966. Weeds of the World, Biology and Control. Interscience Publishers, Inc., New York. 536 pp.
9. Knowles, G. 1953. Selective control of wild oats in cereal crops by maleic hydrazide. Can. J. Agric. Sci. 33:402.
10. Maun, M. A. and Cavers, P. B. 1969. Effects of 2,4-D on seed production and embryo development of curly dock. Weed Sci. 17:533536.
11. Robinson, R. G. 1949. Annual weeds, their viable seed population in the soil, and their effect on yields of oats, wheat, and flax. Agron. J. 41:513518.
12. Rojas-Garciduenas, M. and Kommedahl, T. 1960. The effect of 2,4-D on germination of pigweed seed. Weeds 8:15.
13. Scott, R. A. Jr. 1961. Mechanisms and reversal of gametocide response in cotton. Plant Physiol. 36:529538.
14. Stevens, O. A. 1957. Weights of seeds and numbers per plant. Weeds 5:4655.
15. Taylorson, R. B. 1966. Control of seed production in three annual grasses by dimethylarsinic acid. Weeds 14:207210.
16. Taylorson, R. B. 1970. Changes in dormancy and viability of weed seeds in soils. Weed Sci. 18:265269.
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Weed Science
  • ISSN: 0043-1745
  • EISSN: 1550-2759
  • URL: /core/journals/weed-science
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