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Survey of Common Sunflower (Helianthus annuus) Resistance to Imazethapyr and Chlorimuron in Northeast Kansas

Published online by Cambridge University Press:  12 June 2017

Jolene R. Baumgartner ,
Kassim Al-Khatib  and
Randall S. Currie
Jolene R. Baumgartner
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
Kassim Al-Khatib*
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
Randall S. Currie
Affiliation:
Southwest Research-Extension Center, Kansas State University, Garden City, KS 67846
*
Corresponding author's E-mail: [email protected].
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Abstract

Imazethapyr resistance in common sunflower (Helianthus annuus) was confirmed in 1996 in a field near Rossville, KS. In 1997, common sunflower achenes were collected within a 20-km radius of the field with known resistance to determine if resistance was present in nearby fields or if resistance had spread to the native population on the roadside. Collections were made from 14 soybean (Glycine max) fields, one corn (Zea mays) field, and 11 roadsides. Achenes from Konza Prairie Research Natural Area, a prairie that had received no herbicide applications in the past 25 yr, served as the susceptible control. Common sunflower seedlings were treated in a greenhouse with 71 g ai/ha imazethapyr and 11 g ai/ha chlorimuron. In all 15 fields sampled, at least 1% of the common sunflower exhibited an intermediate response to imazethapyr or chlorimuron. In 13 fields, at least 1% of the plants were resistant to imazethapyr, and in all 15 fields, at least 1% of the plants were resistant to chlorimuron. Ten roadsides had common sunflower that showed intermediate response to imazethapyr or chlorimuron. At least 1% of the plants from seven roadsides were resistant to imazethapyr or chlorimuron. Common sunflower collected from fields with repeated applications of imazethapyr showed more resistance to imazethapyr than to chlorimuron.

Keywords

common sunflower, Helianthus annuus L. # HELANcorn, Zea mays L.soybean, Glycine max (L.) Merr.Herbicide resistanceALS, acetolactate synthase (EC 4.1.3.18)
Type
Research
Information
Weed Technology , Volume 13 , Issue 3 , September 1999 , pp. 510 - 514
Copyright
Copyright © 1999 by the Weed Science Society of America 

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References

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