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Phylogenetic Analysis and Fungicide Baseline Sensitivities of Monilia mumecola in China

L F Yin1, S F Du2, C Chaisiri2

  • 1Key Lab of Horticultural Plant Biology, Ministry of Education, and Experimental Teaching Center of Crop Science, Huazhong Agricultural University, Wuhan 430070, China.

Plant Disease
|June 27, 2019
PubMed

Insights

Genetic analysis of Monilia mumecola, a peach brown rot pathogen, reveals isolates from different locations tend to separate. Fungicide sensitivity assays showed no qualitative resistance shifts, indicating consistent efficacy against this important plant pathogen.

Area of Science:

  • Plant Pathology
  • Mycology
  • Agricultural Science

Background:

  • Monilia mumecola is a primary causal agent of peach brown rot in China.
  • Understanding the genetic diversity and fungicide sensitivity of M. mumecola is crucial for effective disease management.

Purpose of the Study:

  • To analyze the genetic diversity of Monilia mumecola isolates from various locations and hosts.
  • To determine the sensitivity of M. mumecola isolates to four commonly used fungicides: carbendazim, tebuconazole, azoxystrobin, and boscalid.

Main Methods:

  • Genetic analysis of M. mumecola isolates collected from different geographical regions and host plants.
  • Fungicide sensitivity assays were performed on 93 M. mumecola isolates using carbendazim, tebuconazole, azoxystrobin, and boscalid.
  • Determination of effective concentration for 50% mycelial growth inhibition (EC50) for each fungicide.

Main Results:

  • Isolates from different locations showed distinct genetic clustering, while isolates from different hosts within the same location grouped together.
  • Average EC50 values for carbendazim, tebuconazole, azoxystrobin, and boscalid were 0.103, 0.034, 0.325, and 0.419 µg/ml, respectively.
  • Fungicide sensitivity distributions exhibited continuous unimodal curves, suggesting no qualitative shifts in resistance.

Conclusions:

  • Monilia mumecola isolates demonstrate host-jumping potential within localized areas.
  • Current sensitivity levels indicate no widespread qualitative resistance to carbendazim, tebuconazole, azoxystrobin, and boscalid.
  • Consistent fungicide sensitivity across different locations and hosts supports the continued use of these fungicides for peach brown rot control.
Keywords:
baseline sensitivitybrown rotfungicidesgenetic diversity

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