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Herbicide Resistance in Jointed Goatgrass (Aegilops cylindrica): Simulated Responses to Agronomic Practices

Published online by Cambridge University Press:  20 January 2017

D. Eric Hanson ,
Daniel A. Ball  and
Carol A. Mallory-Smith
D. Eric Hanson
Affiliation:
Department of Forest Science, Oregon State University, Corvallis, OR 97333
Daniel A. Ball*
Affiliation:
Columbia Basin Agricultural Research Center, Oregon State University, Pendleton, OR 97801
Carol A. Mallory-Smith
Affiliation:
Department of Crop and Soil Science, Oregon State University, Corvallis, OR 97333
*
Corresponding author's E-mail: daniel.ball@orst.edu.
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Abstract

A population model was constructed to simulate the development of imazamox-resistant jointed goatgrass (AEGCY) in imazamox-resistant (Clearfield™) wheat. The model computed changes in the surface and in the buried AEGCY seed banks for both resistant and susceptible biotypes. Simulations started with an initial density of 1,000 susceptible and zero resistant seeds/m2 in each seed bank. Simulation of continuous, no-till Clearfield wheat production resulted in rapid development of resistant AEGCY without hybridization with wheat and in extremely rapid resistance development with hybridization. In less than 10 yr, the resistant population was growing exponentially in both simulations. Adding a fallow year with tillage into the simulated rotation did not substantially slow down the appearance of resistance but did delay the rate of resistant population increase by several orders of magnitude over 10 yr. Alternating Clearfield and a nonresistant winter wheat in combination with fallowing prevented the establishment of a significant resistant AEGCY population and prevented the susceptible seed population from increasing exponentially. These projections suggest that imazamox-resistant wheat can be a tool for managing AEGCY populations especially if combined with rotations that include fallow and crops other than Clearfield winter wheat.

Keywords

Imazamoxjointed goatgrass, Aegilops cylindrica Host #3 AEGCYwinter wheat, Triticum aestivum L. Clearfield™Crop rotationpollen flowpopulation modelresistance managementALS, acetolactate synthaseBSB, buried seed bankDSP, local seed dispersalEST, established plantMAT, mature plantPRD, seed productionSDL, seedlingSSB, surface seed bank
Type
Research
Information
Weed Technology , Volume 16 , Issue 1 , March 2002 , pp. 156 - 163
Copyright
Copyright © Weed Science Society of America 

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