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Sublethal Doses of Mefenoxam Enhance Pythium Damping-off of Geranium

Carla D Garzón1, Julio E Molineros1, Jennifer M Yánez2

  • 1Oklahoma State University, Stillwater.

Plant Disease
|February 9, 2019
PubMed

Insights

Sublethal doses of mefenoxam can stimulate fungicide-resistant Pythium, increasing damping-off disease in geranium seedlings. This finding is crucial for effective disease management strategies.

Area of Science:

  • Plant Pathology
  • Agricultural Science
  • Mycology

Background:

  • Fungicide resistance in Pythium is a growing concern for disease management.
  • Previous observations suggest sublethal fungicide doses may stimulate Pythium growth.

Purpose of the Study:

  • To investigate the in vitro effect of sublethal mefenoxam doses on Pythium isolates.
  • To determine if mefenoxam stimulation influences Pythium damping-off severity in geraniums.

Main Methods:

  • In vitro radial growth assays of Pythium aphanidermatum on mefenoxam-amended media.
  • Greenhouse experiments inoculating geranium seedlings with mefenoxam-treated Pythium.

Main Results:

  • A mefenoxam-resistant Pythium isolate showed increased radial growth at extremely low mefenoxam concentrations (1 × 10-10 μg/ml).
  • Significant increases in Pythium damping-off severity were observed at mefenoxam concentrations of 1 × 10-6 and 1 × 10-10 μg/ml.

Conclusions:

  • Sublethal mefenoxam doses can stimulate fungicide-resistant Pythium isolates.
  • This stimulation can lead to increased Pythium damping-off in geranium seedlings, impacting disease control.

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