Gray Mold of Pisum sativum Caused by Botrytis cinerea in Korea

In March of 2003, the gray mold occurred severely on pea (Pisum sativum) grown in the green houses and open fields in Changseon-myon, Namhae-gun, Gyeongnam Province, Korea. The symptoms started with water-soaking lesions in the leaves, stems and pods. The typical symptoms of the leaves, stems and pods became withered, discolored and blighted, and then eventually died. The mycelia, conidia and conidiophore of the pathogen appeared on leaves, stems and pods. The conidia were gray, 1-celled, mostly ellipsoid or ovoid in the shape and were $8{\sim}17{\times}5{\sim}13\;{\mu}m$ in size. Conidiophores were $14{\sim}30\;{\mu}m$ in size. The sclerotia were formed abundantly on potato dextrose agar. The optimum temperature for sclerotial formation was $20^{\circ}C$. Pathogenicity of the causal organism was proven according to Koch's postulate. The causal organism was identified as Botrytis cinerea based on mycological characteristics. This is the first report on gray mold of Pisum sativum caused by B. cinerea in Korea.

Botrytis cinerea에 의한 완두 잿빛곰팡이병

2003년 3월 경남 남해군 창선면 비닐하우스 및 노지재배 완두포장에서 Botrytis cinerea에 의한 완두 잿빛곰팡이병이 발생하였다. 병징은 잎, 줄기 및 꼬투리에 발생하여 병든 부분이 수침상으로 물러지고 썩으면서 병반부위에 잿빛곰팡이가 많이 생기고, 심할 경우 감염된 부위는 결국 말라죽는다. 분생포자는 무색, 단포이며 난형 또는 타원형으로 크기는 $8{\sim}17{\times}5{\sim}13\;{\mu}m$였고, 분생자경 위에 분생포자가 아주 많이 형성되었다. 분생자경은 갈색으로 격막이 있고, 폭은 $14{\sim}30\;{\mu}m$였다. 균사생육과 균핵형성 적온은 $20^{\circ}C$였다. 병반에서 분리한 병원균은 Botrytis cinerea에 의한 완두 잿빛곰팡이병으로 동정되었다.