Gray Mold of Agastache rugosa Caused by Botrytis cinerea in Korea

Botrytis cinerea에 의한 배초향 잿빛곰팡이병

Gray mold caused by Botrytis cinerea on Agastache rugosa was occurred at a field of Jinju from 2003 to 2005. The disease symptoms started with water-soaked lesions in the leaves and stem, then these infected lesions became withered, discolored, rotten and died eventually. The fungal pathogen was isolated from the lesions. The fungal conidia were one-celled and mostly ellipsoid or ovoid in shape and light gray in color and $4{\sim}20{\times}4{\sim}13\;{\mu}m$ in size. The fungal conidiophores were $14{\sim}28\;{\mu}m$ in width. The Pathogen formed sclerotia abundantly on PDA. The optimum temperature for mycelial growth and sclerotia formation was $20^{\circ}C$. Pathogenicity of the causal organism was proved according to Koch's postulates. On the basis of symptom, mycological characteristics and pathogenicity test, the fungus was identified as Botrytis cinerea. This is the first report on gray mold of Agastache rugosa caused by B. cinerea in Korea.

2003년부터 2005년까지 3년동안 경남 진주시 장재동 배초향 재배 농가포장에서 잿빛곰팡이병 발생하였다. 병징은 잎과 줄기 부분이 수침상으로 물러지고 썩으면서 감염된 병반부위에 회색의 곰팡이가 많이 생긴다. 분생포자는 무색, 단포자이며 난형 또는 타원형으로 크기는 $4{\sim}20{\times}4{\sim}13\;{\mu}m$였다. 분생포자경은 갈색으로 격막이 있고 나무가지 모양이며, 폭은 $4{\sim}28\;{\mu}m$였다. 균사생육과 균핵형성 적온은 $20^{\circ}C$였다. 병원성 검정은 코흐의 가설에 따라 수행하여 병원성을 확인하였다. 병징과 병원균의 균학적 특징, 병원성을 조사한 결과 Botrytis cinerea에 의한 배초향 잿빛곰팡이병으로 동정되었다.