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Reduction of Landscape Pathogens in Florida by Soil Solarization.

R J McGovern1, R McSorley2, M L Bell3

  • 1Plant Pathology Department.

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|March 2, 2019
PubMed
Summary
This summary is machine-generated.

Soil solarization effectively managed soilborne pathogens and nematodes in impatiens, improving plant growth. Combining solarization with fludioxonil further reduced Rhizoctonia diseases, while biological agents showed limited efficacy.

Keywords:
bedding plantsbiological controldiseases of ornamentalsfunginematodessubtropical climatesustainable disease management

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Area of Science:

  • Plant Pathology
  • Horticultural Science
  • Soil Science

Background:

  • Soilborne pathogens and nematodes significantly impact impatiens cultivation, causing diseases like Rhizoctonia crown rot and root-knot.
  • Effective management strategies are crucial for maintaining impatiens health and productivity in commercial settings.

Purpose of the Study:

  • To evaluate the efficacy of soil solarization, alone and with biological control agents and a fungicide, for managing soilborne pathogens in impatiens.
  • To assess the impact of these treatments on disease incidence, nematode populations, and plant growth.

Main Methods:

  • Two field experiments were conducted in Florida using soil solarization with double-layer polyethylene mulch for 47-48 days.
  • Treatments included soil solarization alone, in combination with Streptomyces lydicus (Actinovate), Pseudomonas chlororaphis (AtEze), and fludioxonil (Medallion).
  • Evaluations focused on disease incidence, nematode population densities, root health, and shoot biomass of impatiens.

Main Results:

  • Soil solarization significantly reduced Rhizoctonia crown rot and blight, Pythium root rot incidence, and root discoloration.
  • Solarization also decreased root-knot severity and populations of several plant-parasitic nematodes, including Meloidogyne incognita.
  • Fludioxonil reduced Rhizoctonia diseases, but biological control agents did not significantly impact pathogen or nematode levels.

Conclusions:

  • Soil solarization is an effective method for managing a broad spectrum of soilborne pathogens and nematodes affecting impatiens.
  • Integrated approaches, such as combining solarization with reduced-risk fungicides, can enhance disease control.
  • Biological control agents tested showed limited efficacy in this study, suggesting further research is needed.