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Emergence and survival of horseweed (Conyza canadensis)

Published online by Cambridge University Press:  12 June 2017

Douglas D. Buhler  and
Micheal D. K. Owen
Micheal D. K. Owen
Affiliation:
Department of Agronomy, Iowa State University, Ames, IA 50011
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Abstract

Horseweed emergence and survival were evaluated in no-tillage soybean and corn at Rosemount, MN, and Ames, IA, from the fall of 1992 through the summer of 1995. Most of the horseweed at both locations emerged in the fall. Winter survival of fall-emerged seedlings ranged from 59 to 91%. Timing and extent of horseweed emergence in spring varied by year and location. Spring emergence ranged from 5 to 32% of total emergence, with greater spring emergence at Rosemount than at Ames. Emergence occurred as late as early June at Rosemount and late May at Ames. Results indicated that horseweed may emerge well into the growing season, and spring emergence should be considered in weed management systems for no-tillage crop production.

Keywords

No-tillageweed ecologyweed population dynamicsERICACorn, Zea mays L.soybean, Glycine max (L.) Merr.horseweed, Conyza canadensis (L.), Cronq. ERICA
Type
Weed Biology and Ecology
Information
Weed Science , Volume 45 , Issue 1 , February 1997 , pp. 98 - 101
Copyright
Copyright © 1997 by the Weed Science Society of America 

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