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Wild oat (Avena fatua) seed production in spring barley (Hordeum vulgare) is affected by the interaction of wild oat density and herbicide rate

Published online by Cambridge University Press:  12 June 2017

Michael J. Wille ,
Donald C. Thill  and
William J. Price
Michael J. Wille
Affiliation:
Department of Plant, Soil, and Entomological Sciences, University of Idaho, Moscow, ID 83844-2339
William J. Price
Affiliation:
Statistical Programs, University of Idaho, Moscow, ID 83844-2339
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Abstract

The efficacy of current wild oat herbicides and their high cost have resulted in use rates that are less than those recommended. While acceptable weed control may be attained at less cost, this practice does not consider the potential for increased wild oat seed production. The objective of this experiment was to determine the interaction of wild oat density and reduced imazamethabenz rates on wild oat seed production in spring barley. As wild oat densities increased from 8 to 1,100 plants m−2, wild oat seed production increased from 180 to 9,950 seed m−2 without herbicide, and from 0 to 2,810 seed m−2 using 0.53 kg ai ha−1 imazamethabenz. This general pattern was modeled using a cumulative logistic function. Estimates from this model indicated that < 1 wild oat seed m−2 was produced at population densities of ≤ 20 plants at any imazamethabenz rate. Imazamethabenz rates of 0.26 kg ha−1 or greater at wild oat densities of less than approximately 190 plants m−2 did not result in wild oat seed production above the initial population density. As wild oat density increased, however, imazamethabenz rates below 0.40 kg ha−1 resulted in substantially greater wild oat seed production compared to the recommended rate.

Keywords

Imazamethabenzwild oat, Avena fatua L. AVEFAspring barley, Hordeum vulgare L., ‘Baronesse.’Imazamethabenz-methylimidazolinoneseedbankseed rainAVEFA
Type
Weed Biology and Ecology
Information
Weed Science , Volume 46 , Issue 3 , June 1998 , pp. 336 - 343
Copyright
Copyright © 1998 by the Weed Science Society of America 

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