Published in Scientific Papers. Series A. Agronomy, Vol. LXIII, Issue 1
Written by Panagiotis KANATAS, Ilias TRAVLOS, Michalis KOLIVAS, Alexandros TATARIDAS, Antonios MAVROEIDIS
The confirmation of glyphosate resistance (GR) biotypes of Conyza canadensis (horseweed) in orchards and vineyards in Greece highlighted the need of alternative methods and tools for the management of this important species. Herbicides with a different mode of action ought to be studied in terms of their efficacy against the herbicide resistant biotypes. The aim of this study was the efficacy evaluation of the herbicides pyraflufen ethyl, florasulam, MCPA and glyphosate, against several horseweed biotypes. Seeds from several biotypes of C. canadensis were sampled and sown in pots. Assessments of fresh and dry weight of horseweed seedlings were carried out 7, 14, 21 and 28 days after treatment (DAT). Pyraflufen ethyl alone or in combination with florasulam, resulted in an exceptional efficacy (>95%) against horseweed, even at 7 DAT. It was also noticeable that the mean accumulation of fresh weight in the treatments with pyraflufen ethyl was significantly reduced compared to the untreated plants (44 to 59% lower at 3 DAT). The findings of the present study reveal the high potential of pyraflufen-ethyl alone or with florasulam for the effective management and control of GR Conyza spp. biotypes. Further research on pot and field experiments is expected to highlight the dynamics of PPO inhibitors against GR horseweed.
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