Reaction of a population of <i>Lolium multiflorum</i> var. <i>westerwoldicum</i> to repeated use of glyphosate

Authors

  • Laura Tamms Universität Rostock, Agrar- und Umweltwissenschafttliche Fakultät, Satower Straße 48, 18051 Rostock
  • Laurie Anne Koning Universität Rostock, Agrar- und Umweltwissenschafttliche Fakultät, Satower Straße 48, 18051 Rostock
  • Friederike de Mol Universität Rostock, Agrar- und Umweltwissenschafttliche Fakultät, Satower Straße 48, 18051 Rostock
  • Bärbel Gerowitt Universität Rostock, Agrar- und Umweltwissenschafttliche Fakultät, Satower Straße 48, 18051 Rostock

Abstract

The use of glyphosate increased globally, this development is accompanied with losses in sensitivity and upcoming resistance and Lolium species have a pronounced role in this development. Lolium multiflorum var. westerwoldicum was sown in a field experiment in 2014, 2015 and 2016. A glyphosate-based herbicide was applied at two dosages (50%, 25% of the registered dose rate). The two treatments were selected to allow for a certain plant survival. The seed production of the surviving population was assessed in the field. Parts of the seeds were again sown in the field in the following year. Other parts of the seeds were used in a dose-response bioassay: Paternal and filial generations (parents (=F0), F1, F2, F3) were tested in a bioassay after three years.
L. multiflorum successfully reproduced under the treatments of the field experiment. The re-sown seeds of the filial generations established in the field at lower rates. The bioassays indicated a tendency for decreasing glyphosate sensitivities (ED50, ED90 ) in the filial generations.

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Published

2018-01-25

Issue

No. 458 (2018): Proceedings 28th German Conference on Weed Biology and Weed Control, February 27 - March 1, 2018, Braunschweig, Germany

Section

Session 4: Non-selective herbicides

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