Yellow bristle grass (Setaria pumila) germination biology

  • Claire A. Dowsett AgResearch
  • Chris Buddenhagen AgResearch
  • Trevor K. James AgResearch
  • Craig R. McGill Massey University
Keywords: Setaria pumila, yellow bristle grass, germination, seed persistence

Abstract

The presence of Setaria pumila in dairy pastures lowers feed quality and may cause grazing avoidance. More information is required about the germination biology of this weed to improve the effectiveness of control strategies. Base temperature and germination profile were determined on a thermo-gradient table. For emergence depth, seeds were buried at 0–50 mm and time to emerge recorded. Seed persistence was tracked at seven field sites over 5 years and in a laboratory-based controlled-ageing test. Base temperature for germination was 10.2°C, germination was most rapid at 30–35°C and most numerous from 20–30°C. Emergence occurred from 2–50 mm depth but mostly from 2–15 mm. The controlled-ageing test indicated the seed was viable for <3 years. However, some Setaria pumila seed continued to germinate after 5 years of burial in all but the clay soil. Farmers should try to prevent this species from seeding for at least 5 years to reduce  the seed bank. Soil inversion could promote dormancy and seed persistence.  If followed by effective control, cultivation could stimulate germination and further reduce the seed bank.

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Published
2018-07-28
How to Cite
Dowsett, C., Buddenhagen, C., James, T., & McGill, C. (2018). Yellow bristle grass (Setaria pumila) germination biology. New Zealand Plant Protection, 71, 72-80. https://doi.org/https://doi.org/10.30843/nzpp.2018.71.154
Section
Vol 71 Weeds 2018