Gray Mold of <i>Zinnia elegans</i> Caused by <i>Botrytis cinerea</i> in Korea

Research in Plant Disease 2004;10(4):337-340.
Published online December 31, 2004.

Botrytis cinerea에 의한 백일홍 잿빛곰팡이병

권진혁^*, 손경애, 정선기, 박창석¹

경상남도농업기술원, ¹경상대학교 농업생명과학대학

Gray Mold of Zinnia elegans Caused by Botrytis cinerea in Korea

Jin-Hyeuk Kwon*, Kyung-Ae Son, Seon-Gi Jeong, Chang-Seuk Park1

Gyeongsangnam-do Agricultural Research and Extension Servies, Jinju 660-360, Korea
¹College of Agriculture and Life Sciences, Gyeongsang National University, Jinju 660-701, Korea

Correspondence: Jin-Hyeuk Kwon,Phone)+82-55-750-6319, Fax)+82-55-750-6229, E-mail)Kwon825@mail.knrda.go.kr

Received: September 24, 2004

Abstract

In April of 2003, the gray mold disease caused by Botrytis cinerea was occured 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 20°C. 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.

Key Words: Botrytis cinerea, gray mold, Zinnia elegans