Skip to main content Accessibility help

Control of Triazine-Resistant Kochia (Kochia scoparia) in Conservation Tillage Corn (Zea mays)

  • Gail A. Wicks (a1), Alex R. Martin (a1) and Garold W. Mahnken (a1)


Triazine-resistant (TR) kochia control with herbicides was evaluated in the greenhouse and in the field on ridge-till and ecofallow corn. In the greenhouse, bromoxynil, dicamba, linuron, and paraquat applied POST controlled TR kochia > 86%. Control of TR kochia with 2,4-D ester at 0.3 kg ae ha−1 varied with kochia biotype. In three ridge-till fields in 1985, atrazine plus fluorochloridone at 2.2 plus 0.6 kg ai ha−1 applied before planting plus a layby cultivation was the only treatment that reduced TR kochia biomass to < 750 kg ha−1. In 1986, atrazine plus dicamba at 2.2 plus 0.3 kg ha−1, atrazine plus fluorochloridone at 2.2 plus 0.3 or 0.6 kg ha−1 applied EPOST; atrazine at 2.2 kg ha−1 applied EPOST followed by an MPOST application of bromoxynil at 0.3 or 0.4 kg ha−1, or dicamba plus 2,4-D ester at 0.3 plus 0.3 kg ha−1; and an MPOST application of atrazine plus dicamba at 1.3 plus 0.5 kg ha−1, atrazine plus pyridate at 1.1 plus 1.0 kg ai ha−1, or pyridate plus cyanazine at 1.0 plus 1.7 kg ai ha−1 followed by a layby cultivation reduced kochia biomass to < 400 kg ha−1. In ecofallow corn, the only herbicide treatment that consistently controlled TR kochia > 95% 21 to 30 d after application was pyridate plus fluorochloridone at 1.0 plus 0.6 kg ha−1. Other treatments were less effective because kochia was too large or additional kochia emerged after application. When added to atrazine plus cyanazine, paraquat at 0.3 kg ai ha−1 plus dicamba was more effective than paraquat plus 2,4-D ester or paraquat alone in controlling TR kochia.



Hide All
1. Ahrens, W. H. and Hemenway, J. A. 1987. Paraquat and sethoxydim plus 2,4-D for no-till burndown, Pillsbury, 1987. Res. Rep. North Cent. Weed Control Conf. 44:305.
2. Bell, A. R., Nalewaja, J. D., and Schooler, A. B. 1972. Response of kochia selections to 2,4-D, dicamba, and picloram. Weed Sci. 20:458462.
3. Buhler, D. D. 1988. Factors influencing fluorochloridone activity in no-till corn (Zea mays). Weed Sci. 36:207214.
4. Burnside, O. C. and Wicks, G. A. 1982. Weed control in corn planted into untilled winter wheat stubble. Agron. J. 74:521526.
5. Burnside, O. C., Fenster, C. R., Evetts, L. L., and Mumm, R. F. 1981. Germination of exhumed weed seed in Nebraska. Weed Sci. 29:577586.
6. Haack, A. E. 1987. Geographic distribution of triazine-resistant kochia [Kochia scoparia (L.) Schrad.] in Nebraska and response to selected herbicides. M.S. Thesis, Univ. Nebraska. 64 pp.
7. Holt, J. S. and LeBaron, H. M. 1990. Significance and distribution of herbicide resistance. Weed Technol. 4:141149.
8. Johnston, D. D. and Wood, W. N. 1976. Kochia scoparia control in noncropland. Proc. North Cent. Weed Control Conf. 31:126128.
9. LeBaron, H. M. 1991. Herbicide resistant weeds continue to spread. Pages 3637 in Whalon, M. and Hollingworth, R., eds. Resistant Pest Management. Pest Res. Ctr., East Lansing, MI.
10. Salhoff, C. R. and Martin, A. R. 1986. Kochia scoparia growth response to triazine herbicides. Weed Sci. 34:4042.
11. Wicks, G. A., Smika, D. E., and Hergert, G. W. 1988. Long-term effects of no-tillage in a winter wheat (Triticum aestivum)-sorghum (Sorghum bicolor)-fallow rotation. Weed Sci. 36:384393.
12. Zorner, P. S., Zimdahl, R. L., and Schweizer, E. E. 1984. Effect of depth and duration of seed burial on kochia (Kochia scoparia). Weed Sci. 32:602607.


Control of Triazine-Resistant Kochia (Kochia scoparia) in Conservation Tillage Corn (Zea mays)

  • Gail A. Wicks (a1), Alex R. Martin (a1) and Garold W. Mahnken (a1)


Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed