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Whole-mount Clearing and Staining of Arabidopsis Flower Organs and Siliques

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Characterization of Botrytis cinerea From Commercial Cut Flower Roses.

M Muñoz¹, J E Faust¹, G Schnabel¹

¹Department of Plant and Environmental Sciences, Clemson University, Clemson, SC 29634.

|May 15, 2019

Summary

Gray mold (Botrytis cinerea) causes economic losses in cut roses. Many isolates show resistance to common fungicides, highlighting the need for resistance management strategies to improve disease control.

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Area of Science:

Plant Pathology
Horticultural Science
Mycology

Background:

Botrytis cinerea causes significant postharvest economic losses in cut roses.
Current disease management relies on cultural practices and preventative fungicides, yet gray mold outbreaks persist.
Understanding Botrytis species composition and fungicide resistance is crucial for effective management.

Purpose of the Study:

To determine Botrytis species composition in Colombian cut roses.
To assess gray mold incidence, severity, and associated fungal pathogens.
To identify fungicide resistance profiles of Botrytis isolates.

Main Methods:

Evaluation of rose tissues from commercial shipments for Botrytis species.
Morphological characterization and identification of Botrytis isolates.
Determination of fungicide resistance using discriminatory doses.

Main Results:

All 49 Botrytis isolates were identified as Botrytis cinerea.
Disease incidence was highest in rose petals compared to other tissues.
Widespread resistance to thiophanate-methyl, iprodione, boscalid, and cyprodinil was observed, with multi-class resistance common.

Conclusions:

Fungicide resistance in Botrytis cinerea is prevalent in commercial cut rose production.
Resistance to multiple fungicide classes complicates disease control efforts.
Implementing fungicide resistance management practices is essential for improving gray mold control in cut roses.