Physiological properties affecting the resistance of Botrytis cinerea isolates to fungicides [electronic resource].

Includes references.

Forty isolates of Botrytis cinerea were isolated from pepper (10 isolates), strawberry (15 isolates), and grape (15 isolates) collected from different governorates in Egypt. All tested isolates proved to be pathogenic to the hosts from which these isolates were isolated. The current acquired fungicidal resistance level in the natural population of Botrytis cinerea isolated from pepper, strawberry, and grape to the fungicides Sumisclex and Tecto was estimated. Resistance factors to the tested fungicides obviously differed from one isolate to the other. The fungus proved to be unspecific to a certain host which means all fungus isolates belong to only one population. The recalculated resistance factors ranged from 1.0 to 30.7 for Sumisclex but do not change for Tecto. Fungal acquired resistance to Sumisclex was negatively correlated with the catalase enzyme, while it was positively correlated with polyphenol oxidase, peroxidase and catalase enzymes for Tecto. The content of flavonoids (antioxidant substances) was higher in isolates resistant to Sumisclex than in sensitive ones. No clear correlation was observed between the sterol content of resistant isolates and the resistance to Sumisclex or Tecto.

Summary in Arabic.

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