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In summer 2018, brown stripe symptoms were observed on leaf blades of perennial ryegrass (Lolium perenne L.) used as a turfgrass in an athletic field in Saitama Prefecture, Japan. Bacterial ooze exuded from lesions, from which a pathogenic bacterium was isolated. Inoculation of blades of perennial ryegrass with the isolates reproduced the same symptoms. Pathogenicity and bacteriological properties of the isolates were almost identical to those of Acidovorax avenae, and the identification was supported by phylogenetic analysis. This is the first report of the brown stripe on perennial ryegrass caused by A. avenae (= A. avenae subsp. avenae) in Japan. [ABSTRACT FROM AUTHOR]

In July 2013, black spots were observed on leaves of calanthe in a flowerbed of a park in Tokyo, Japan. The spots were circular to oval and often accompanied by a yellow halo. A bacterium was isolated from the lesions and was found to cause the same symptoms on calanthe leaves after inoculation. Based on phylogenetic and bacteriological analyses, the causal bacterium was identified as Burkholderia andropogonis. This is the first report of bacterial black spot on calanthe caused by B. andropogonis in Japan. [ABSTRACT FROM AUTHOR]