Incidence of Bacterial Brown Spot of Phalenopsis Orchids Caused by Acidovorax avenae subsp. cattleyae

Han, Kyung Sook; Lee, Seung Don; Park, Jong Han; Han, You Kyoung; Kim, Dae Hyun; Lee, Jung Sup

Research in Plant Disease 2009;15(3):183-186.
Published online December 30, 2009.

Acidovorax avenae subsp. cattleyae에 의한 팔레놉시스 세균성갈색점무늬병의 발생

한경숙, 이승돈, 박종한, 한유경, 김대현, 이정섭

Incidence of Bacterial Brown Spot of Phalenopsis Orchids Caused by Acidovorax avenae subsp. cattleyae

Kyung Sook Han, Seung Don Lee, Jong Han Park, You Kyoung Han, Dae Hyun Kim, Jung Sup Lee

Abstract

Leaf spot symptoms were observed in a commercial Palenopsis cultivated fields. Circular-elliptical watersoaked spots surrounded by a light green or yellow halo and turned to black when it was severe infection or blacken with gathered symptoms. These spots were finally enlarged to form of larger areas. Under the favorable conditions of temperature and moisture, the infection extended rapidly and dispersed to the crown and sometimes the infected plant became dead. A bacterial organism, isolated from the advancing margins of the lesions, was tested to characterize causing bacterium based on pathogenicity. The biochemical and physiological tests of that bacterium identified that as an Acidovorax avenae subsp. cattleyae. Therefore, we suggested to call that the new Phalaenopsis disease was bacterial brown spot caused by A.avenae subsp. cattleyae in Korea.

Key Words: Acidovorax avenae subsp. cattleyae, Orchid, Phalaenopsis