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Occurrence of Bacterial Wilt on Autumn Maple Tree
Wilt symptoms of autumn maple plants observed 7 days after inoculation (A left), and check plants without symptoms (A right), Close-up of brownish vascular tissue of stem after inoculation (B).
Wilt symptoms of autumn maple plants observed 7 days after inoculation (A left), and check plants without symptoms (A right), Close-up of brownish vascular tissue of stem after inoculation (B).

Author:Chia-Hsin Tsai*, Pao-Jen Ann, Shu-Ling Hwang, Yun-Sheng Lu, Jia-Rong Li, and Zi-Qing Hong

Abstract:

    In 2011 some decline autumn maple trees were observed in Changhua County. The diseased trees showed leaf chlorosis, stunting, and wilt symptoms. Internally, brown discoloration of vascular tissues was observed in the infected stem. The bacteria isolated from the stem with disease symptoms formed fluidal, white colonies with pink center on triphenyl tetrazolium chloride medium. In Koch’s postulates test, the inoculated autumn maple plants developed brown vascular and wilt symptoms as those observed in the field. The same bacteria were re-isolated from symptomatic plants. Based on physiological and biochemical properties, Biolog identification system, 16S rDNA sequence analysis, host range test and multiplex PCR, the causal organism was identified as Ralstonia solanacearum race1/biovar3/phylotype 1. This is the first report of bacterial wilt of autumn maple tree caused by R. solanacearum in the world.

Key words:Autumn maple tree, Bacterial wilt, Ralstonia solanacearum

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Journal of
Taiwan Agricultural Research
Vol. 73, No.1 (2024) ISSN: 2790-086X Vol. 73, No.1 (2024)
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