Biological Characteristics and Fungicides for Effective Control of Colletotrichum destructivum on Echeveria Perle von Nürnberg

  Objective  Biological characteristics of Colletotrichum destructivum that infects Echeveria Perle von Nürnberg and in vitro toxicity of 6 fungicides on the pathogen were studied for the disease control.

  Method  Effects of temperature, pH, photoperiods, carbon, and nitrogen on the growth and 6 fungicides on their legality on C. destructivum were determined by an in vitro culture method.

  Result   The optimum growth conditions for C. destructivum were 30 ℃ at pH 8 on medium using starch for carbon and yeast for nitrogen resources. Photoperiods did not significant affect the mycelial growth. The 6 selected fungicides exhibited varying degrees of efficacy against C. destructivum. The EC₅₀ of fludioxonil at 0.023 6 mg·L⁻¹ was the most potent of them. It was followed by prochloraz at 0.030 6 mg·L⁻¹, pyraclostrobin at 0.048 7 mg·L⁻¹, thiophanate-methyl at 0.152 6 mg·L⁻¹, difenoconazole at 0.195 5 mg·L⁻¹, and carbendazim at 0.219 9 mg·L⁻¹.

  Conclusion  The growth of C. destructivum was affected by temperature, pH, carbon, and nitrogen and inhibited by fludioxonil, prochloraz, and pyraclostrobin.