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Bearded sprangletop (Diplachne fusca ssp. fascicularis) flooding tolerance in California rice

  • Katie E. Driver (a1), Kassim Al-Khatib (a2) and Amar Godar (a3)

Abstract

Bearded sprangletop is a problematic weed in California rice production. The objective of this research was to determine the response of two bearded sprangletop biotypes (clomazone-susceptible [S] and -resistant [R]) to flooding depth. A study was conducted in 2017 and 2018 at the California Rice Experiment Station in Biggs, CA, to evaluate the flooding tolerance of the two biotypes against 5-, 10-, and 20-cm continuous flooding depths. Plant emergence, plant height, panicles per plant, seed per panicle, 100-seed weight, and seed per plant data were collected. At the 5-cm flood depth, neither biotype was controlled, and the R biotype had 260% more emergence, produced 475% more panicles per plant, and 455% more seed per plant than the S biotype. With a 10-cm flood, only the R biotype survived flooding and produced more panicles per plant and seed per plant than any other flood depth–biotype combination evaluated. There was no emergence of either bearded sprangletop biotype at the 20-cm flood depth. Continuous flooding can still be used as a management tool to control bearded sprangletop; however, the depth of flooding appears to limit emergence of S biotypes at 5 cm and R biotypes at 10 cm, and completely inhibits growth of both biotypes at 20 cm. The results of this study indicate that clomazone-resistant bearded sprangletop is more likely to spread throughout the Sacramento Valley because this biotype can survive clomazone applications and can tolerate a standard 10-cm flood.

Copyright

Corresponding author

Author for correspondence: Kassim Al-Khatib, Melvin Androus Endowed Professor for Weed Science, Department of Plant Sciences, MS4, One Shields Avenue, University of California, Davis, 95616. Email: kalkhatib@ucdavis.edu

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Keywords

Bearded sprangletop (Diplachne fusca ssp. fascicularis) flooding tolerance in California rice

  • Katie E. Driver (a1), Kassim Al-Khatib (a2) and Amar Godar (a3)

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