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Common waterhemp (Amaranthus rudis) interference in soybean

  • Aaron G. Hager, Loyd M. Wax (a1), Edward W. Stoller (a1) and Germán A. Bollero (a2)


Common waterhemp has become a problem weed species in Midwest soybean production. Determining the critical interference period after soybean and common waterhemp emergence is necessary for the implementation of weed control practices before soybean seed yield loss occurs. Field experiments were conducted during 1996, 1997, and 1998 to determine the influence of duration of common waterhemp interference on soybean seed yield. Removal of common waterhemp 2 wk after soybean unifoliolate leaf expansion resulted in soybean seed yield equivalent to a season-long weed-free control. Delaying common waterhemp removal until 4 wk after soybean unifoliolate leaf expansion resulted in decreased soybean seed yield. Allowing common waterhemp interference to persist 10 wk after soybean unifoliolate leaf expansion reduced soybean seed yield by an average of 43% over 3 yr. These results suggest that soybean producers should implement common waterhemp management strategies earlier than 4 wk after soybean unifoliolate leaf expansion in order to reduce the potential loss of soybean seed yield.


Corresponding author

Corresponding author. Department of Crop Sciences, University of Illinois, Urbana, IL 61801;


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Ahrens, W. H., Wax, L. M., and Stoller, E. W. 1981. Identification of triazine-resistant Amaranthus spp. Weed Sci. 29:345348.
Anderson, D. D., Roeth, F. W., and Martin, A. R. 1996. Occurrence and control of triazine-resistant common waterhemp (Amaranthus rudis) in field corn (Zea mays). Weed Technol. 10:570575.
Bensch, C. N., Horak, M. J., and Peterson, D. E. 2000. Amaranthus competition in soybean. Proc. North Cent. Weed Sci. Soc. 55:81.
Carmer, S. G., Nyquist, W. E., and Walker, W. M. 1989. Least significant differences for combined analysis of experiments with two or threefactor treatment designs. Agron. J. 81:665672.
Feltner, K. C., Hyrst, H. R., and Anderson, L. E. 1968. Tall waterhemp competition in grain sorghum. Weed Sci. 16:214216.
Foes, M. J., Liu, L., Tranel, P. J., Wax, L. M., and Stoller, E. W. 1998. A biotype of common waterhemp (Amaranthus rudis) resistant to triazine and ALS herbicides. Weed Sci. 46:514520.
Gleason, H. A. and Cronquist, A. 1991. Manual of Vascular Plants of the Northeastern United States and Adjacent Canada. 2nd ed. New York: New York Botanical Garden. pp. 104108.
Hager, A. G., Wax, L. M., Simmons, F. W., and Stoller, E. W. 1997. Waterhemp management in agronomic crops. Univ. Ill. Bull. 855:12.
Hartzler, R. G., Buhler, D. D., and Stoltenberg, D. E. 1999. Emergence characteristics of four annual weed species. Weed Sci. 47:578584.
Hinz, J.R.R. and Owen, M.D.K. 1997. Acetolactate synthase resistance in a common waterhemp (Amaranthus rudis) population. Weed Technol. 11:1318.
Horak, M. J. and Peterson, D. E. 1995. Biotypes of Palmer amaranth (Amaranthus palmeri) and common waterhemp (Amaranthus rudis) are resistant to imazethapyr and thifensulfuron. Weed Technol. 9:192195.
Horak, M. J., Peterson, D. E., Chessman, D. J., and Wax, L. M. 1994. Pigweed Identification: A Pictorial Guide to the Common Pigweeds of the Great Plains. Manhattan, KS: Kansas State University. 12 p.
Klingaman, T. E. and Oliver, L. R. 1994. Palmer amaranth (Amaranthus palmeri) interference in soybeans (Glycine max). Weed Sci. 42:523527.
Moolani, M. K., Knake, E. L., and Slife, F. W. 1964. Competition of smooth pigweed with corn and soybeans. Weeds 12:126128.
Nave, W. R. and Wax, L. M. 1971. Effect of weeds on soybean yield and harvesting efficiency. Weed Sci. 19:533535.
Pratt, D. B. and Owen, M.D.K. 1999. Species circumscriptions of common and tall waterhemp. Proc. North Cent. Weed Sci. Soc. 54:171.
[SAS] Statistical Analysis Systems Institute. 2000. SAS User's Guide. Version 8. Cary, NC: Statistical Analysis Systems Institute.
Sauer, J. 1957. Recent migration and evolution of the dioecious Amaranths. Evolution 11:1131.
Shurtleff, J. L. and Coble, H. D. 1985. Interference of certain broadleaf weed species in soybeans (Glycine max). Weed Sci. 33:654657.
Sprague, C. L., Stoller, E. W., and Wax, L. M. 1997. Response of an acetolactate synthase (ALS)-resistant biotype of Amaranthus rudis to selected ALS-inhibiting and alternative herbicides. Weed Res. 37:93101.
Wax, L. M. 1995. Pigweeds of the Midwest—distribution, importance, and management. Proc. Iowa Integr. Crop Manag. Conf. 7:239242.
Wetzel, D. K., Horak, M. J., Skinner, D. Z., and Kulakow, P. A. 1999. Transferal of herbicide resistance traits from Amaranthus palmeri to Amaranthus rudis . Weed Sci. 47:538543.


Common waterhemp (Amaranthus rudis) interference in soybean

  • Aaron G. Hager, Loyd M. Wax (a1), Edward W. Stoller (a1) and Germán A. Bollero (a2)


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