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Response of Kochia Selections to 2,4-D, Dicamba, and Picloram

Published online by Cambridge University Press:  12 June 2017

Allyn R. Bell ,
John D. Nalewaja  and
A. B. Schooler
Allyn R. Bell
Affiliation:
Dep. of Agron., N. D. State Univ., Fargo, North Dakota, 58102
John D. Nalewaja
Affiliation:
Dep. of Agron., N. D. State Univ., Fargo, North Dakota, 58102
A. B. Schooler
Affiliation:
Dep. of Agron., N. D. State Univ., Fargo, North Dakota, 58102
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Abstract

Thirteen selections of kochia (Kochia scoparia (L.) Schrad.), self-pollinated for four generations, varied in response to (2,4-dichlorophenoxy)acetic acid (2,4-D) and 3,6-dichloro-o-anisic acid (dicamba). The most susceptible selection was injured more by 0.35 kg/ha of the dimethylamine salt of 2,4-D than the most tolerant by 0.70 kg/ha based on visual injury rating, growth in plant diameter relative to untreated controls, and seed production. The 0.28 kg/ha rate of dicamba injured the most susceptible selection as much as 0.54 kg/ha injured the most tolerant based on visual injury rating and change in plant diameter. Plant size and maturity influenced the response of kochia to herbicides, but the differences in response among selections could not be explained by variations in size or maturity. All kochia selections were tolerant to 4-amino-3,5,6-trichloropicolinic acid (picloram) at 4.28 kg/ha.

Type
Research Article
Information
Weed Science , Volume 20 , Issue 5 , September 1972 , pp. 458 - 462
Copyright
Copyright © Weed Science Society of America 

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References

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