Weedy rice (Oryza spp.)

Masilamany Dilipkumar, Virender Kumar, Beng Kah Song, Kenneth M. Olsen, Tse Seng Chuah, Sharif Ahmed, Sheng Qiang

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

1 Scopus citations


Weedy rice (Oryza spp.) has emerged as a global threat to rice production in direct-seeded rice (DSR) systems. It is a difficult-to-control weed in DSR because of its close similarity to cultivated rice and lack of in-crop selective herbicide options for its control. Therefore integration of multiple tactics at multiple times (prior to and after rice sowing) would be needed for its effective and sustainable management in conventional (nonherbicide tolerant) rice cultivars. These multiple tactics include the use of clean seed machinery, tillage manipulation, stale seedbed technique, a combination of preemergence herbicides (e.g., pretilachor or oxadiazon) and flooding before rice sowing, manipulating crop-weed competition in favor of rice by using high seeding rate, rotation of rice establishment methods, line sowing, hand/mechanical weeding/roguing, early flooding, and crop rotation. Herbicide-tolerant rice technology enables the use of selective herbicides (in-crop) for controlling weedy rice effectively in DSR.

Original languageEnglish
Title of host publicationBiology and Management of Problematic Crop Weed Species, 1st Edition
Number of pages25
ISBN (Electronic)9780128229170
StatePublished - Jan 1 2021


  • Anaerobic germination tolerant rice
  • Clean seed
  • Direct-seeded rice
  • Herbicide-tolerant rice
  • Rice
  • Seed shattering
  • Stale seedbed


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