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Control of cucumber downy mildew with novel fungicidal mixtures of Oxathiapiprolin

Abstract

The efficacy of four oxathiapiprolin (OXPT)-based, novel fungicidal mixtures against downy mildew in cucumber caused by Pseudoperonospora cubensis was examined in growth chambers. OXPT+chlorothalonil (CHT) mixed at weight ratio of 1 + 66.7; OXPT+ azoxystrobin (AZ) 1 + 10.3; OXPT+mandipropamid (MPD) 1 + 8.3; and OXPT+mefenoxam (MFX) 1 + 3, were compared with each other and with individual components. Mixtures performed better than all fungicides alone except for oxathiapiprolin. Of the four mixtures, OXPT+MFX outperformed the other treatments with the highest preventive, curative, translaminar, root treatment and seed treatment efficacies. Deployment in the field of such mixtures with reduced doses of oxathiapiprolin may lower the selection pressure imposed on P. cubensis and delay the buildup of subpopulations resistant to oxathiapiprolin.

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Abbreviations

ai:

active ingredient

ppm:

parts per million (by weight)

dpi:

days post inoculation

CK:

control untreated

ED:

effective dose

BF:

blind formulation

EC:

emulsifiable concentrate

DC:

dispersible concentrate

SC:

suspension concentrate

SL:

soluble liquid concentrate

OD:

oil dispersion

MIC:

minimal inhibitory concentration

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Correspondence to Yigal Cohen.

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The authors declare that they have no conflict of interest. This study complies with the ethical requirements of Phytoparasitica as appear in the Instructions to Authors.

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Cohen, Y., Rubin, A.E. & Galperin, M. Control of cucumber downy mildew with novel fungicidal mixtures of Oxathiapiprolin. Phytoparasitica 46, 689–704 (2018). https://doi.org/10.1007/s12600-018-0702-6

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  • DOI: https://doi.org/10.1007/s12600-018-0702-6

Keywords

  • Cucurbits
  • Fungicides
  • Mefenoxam
  • Oomycetes
  • Oxysterol binding proteins
  • Orondis
  • Resistance to fungicides
  • Zorvec