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Propiconazole Inhibits Armillaria tabescens In Vitro and Translocates into Peach Roots Following Trunk Infusion.

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Intravascular trunk infusion of propiconazole effectively controls Armillaria root rot in peach trees. This fungicide demonstrated basipetal movement, moving downwards in the tree, confirming its potential for targeted disease management.

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Area of Science:

  • Plant Pathology
  • Mycology
  • Agricultural Chemistry

Background:

  • Armillaria root rot poses a significant threat to Prunus species.
  • Intravascular trunk infusion of propiconazole shows promise for disease control.
  • Basipetal movement of propiconazole in trees requires verification.

Purpose of the Study:

  • To verify the basipetal movement of propiconazole in peach trees after intravascular trunk infusion.
  • To assess the efficacy of propiconazole against Armillaria tabescens in vitro.
  • To determine propiconazole concentrations in various tree tissues.

Main Methods:

  • In vitro assessment of propiconazole's efficacy against Armillaria tabescens isolates.
  • Intravascular trunk infusion of propiconazole into peach trees across different seasons (spring, summer, fall) over two years.
  • Quantification of propiconazole concentration in trunk sections and primary roots using gas chromatography-mass spectrometry.

Main Results:

  • Propiconazole exhibited potent in vitro inhibition of Armillaria tabescens mycelial growth (EC50 = 0.6 μg/ml).
  • Consistent accumulation of propiconazole was detected in primary peach roots following spring and fall infusions.
  • Propiconazole was detected in trunk sections both above and below the infusion site, confirming basipetal movement.

Conclusions:

  • Propiconazole demonstrates significant in vitro activity against Armillaria tabescens.
  • Intravascular infusion facilitates basipetal movement of propiconazole within peach trees.
  • Propiconazole trunk infusion is a viable strategy for targeted Armillaria root rot management.