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

Published online by Cambridge University Press:  12 June 2017

Gail A. Wicks ,
Alex R. Martin  and
Garold W. Mahnken
Gail A. Wicks
Affiliation:
Univ. Nebraska, Dep. Agron. West Cent. Res. and Ext. Ctr., North Platte, NE 69101
Alex R. Martin
Affiliation:
Univ. Nebraska, Dep. Agron. West Cent. Res. and Ext. Ctr., North Platte, NE 69101
Garold W. Mahnken
Affiliation:
Univ. Nebraska, Dep. Agron. West Cent. Res. and Ext. Ctr., North Platte, NE 69101
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Abstract

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.

Keywords

Atrazine, 6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diaminebromoxynil, 3,5-dibromo-4-hydroxybenzonitriledicamba, 3,6-dichloro-2-methoxybenzoic acidfluorochloridone, 3-chloro-4-(chloromethyl)-1-[3-(trifluoromethyl)phenyl]-2-pyrrolidinoneparaquat, 1,1′-dimethyl-4,4′-bipyridinium ionlinuron, N′-(3,4-dichlorophenyl)-N-methoxy-N-methylureapyridate, O-(6-chloro-3-phenyl-4-pyridazinyl)-s-octyl carbonothioate2,4-D, (2,4-dichlorophenoxy)acetic acidkochia, Kochia scoparia (L.) Schrad. # KCHSCcorn, Zea mays L.Atrazineconservation tillageecofallowherbicide resistanceridge-tillno-tillKCHSC
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 41 , Issue 2 , June 1993 , pp. 225 - 231
Copyright
Copyright © 1993 by the Weed Science Society of America 

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References

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