Botrytis cinerea에 의한 백일홍 잿빛곰팡이병 = Gray Mold of Zinnia elegans Caused by Botrytis cinerea in Korea

다국어 초록 (Multilingual Abstract)

In April of 2003, the gray mold disease caused by Botrytis cinerea in zinnia seedlings grown in greenhouse at
Gyeongsangnam-do Agricultural Research and Extension Services, and farmer's nursery. The symptoms of
infected plants were started with water-soaking lesions in flower bud leaves and stems. The lesions gradually
expanded and infected plants became withered and discolored to gray or dark from the tip. The conidia and
mycelia of the pathogen were appeared on flowers, leaves and stem. The conidia were gray, 1-celled, mostly
ellipsoid or ovoid in shape and were 5~16 × 4~8 µm in size. Conidiophores were 12~28 µm in size. The pathogenic
fungi formed sclerotia abundantly on potato dextrose agar. The optimum temperature for sclerotial formation
was 20oC. Pathogenicity of the causal organism was proved according to Koch’s postulate. The causal
organism was identified as Botrytis cinerea Persoon: Fries based on mycological characteristics. This is the
first report on gray mold of Zinnia elegans caused by Botrytis cinerea in Korea.