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Survey of bearded sprangletop (Leptochloa fusca spp. fasicularis) response to clomazone in California rice

Published online by Cambridge University Press:  17 February 2020

Katie E. Driver Open the ORCID record for Katie E. Driver [Opens in a new window] ,
Kassim Al-Khatib  and
Amar Godar
Katie E. Driver
Affiliation:
Graduate Student Researcher, University of California, Davis, Davis, CA, USA
Kassim Al-Khatib*
Affiliation:
Melvin Androus Endowed Professor for Weed Science, University of California, Davis, Davis, CA, USA
Amar Godar
Affiliation:
Postdoctoral Research Associate, University of California, Davis, California Rice Experiment Station, Biggs, CA, USA
*
Author for correspondence: Kassim Al-Khatib, Melvin Androus Endowed Professor for Weed Science, Dept. of Plant Sciences, MS4, University of California, Davis, One Shields Avenue, Davis, CA, 95616. Email: kalkhatib@ucdavis.edu
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Abstract

Bearded sprangletop is a problematic weed in California rice production and few herbicides provide effective control. As control of bearded sprangletop has declined, grower suspicion of resistance to clomazone has increased, because of the continuous rice cropping system and herbicide dependence in the region. The objectives of this research were to confirm clomazone resistance in bearded sprangletop populations and determine the level of resistance. Seed from 21 suspected clomazone-resistant populations was collected from the California rice growing region. A greenhouse experiment was conducted to determine population sensitivity to clomazone. Clomazone was applied into the water to emerging seedlings. Plant ht and control of bearded sprangletop were recorded weekly for 3 wk, plants were then harvested, and dry weight was measured. Of the populations tested, 17 were susceptible and four (5%) were resistant to clomazone. A dose-response assay was conducted using eight doses ranging from an eighth of the full rate to 12 times the full rate. The three most resistant populations had resistant-to susceptible ratios of 1.25×, 2×, and 5× the labeled rate of clomazone. The use of clomazone in California rice production is beneficial; however, it should be used at the appropriate timing and as part of an herbicide program to prevent further development of clomazone resistance.

Keywords

Clomazonebearded sprangletop, Leptochloa fusca (L.) Kunth ssp. fascicularis (Lam.) N. Snowrice, Oryza sativa L.Dose responseherbicide resistance
Type
Research Article
Information
Weed Technology , Volume 34 , Issue 5 , October 2020 , pp. 661 - 665
Copyright
© Weed Science Society of America, 2020

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Footnotes

Associate Editor: Jason Bond, Mississippi State University

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