Dispersal of Citrus Bacterial Canker Caused by Xanthomonas axonopodis pv. citri in Nursery Plots of Unshiu Orange

Myung, Inn Shik; Nam, Ki Woong; Kwon, Hyeog Mo

doi:2003.19.4.205

Plant Pathol J > Volume 19(4); 2003 > Article

The Plant Pathology Journal 2003;19(4):205-209.
DOI: https://doi.org/10.5423/PPJ.2003.19.4.205 Published online August 31, 2003.

Dispersal of Citrus Bacterial Canker Caused by Xanthomonas axonopodis pv. citri in Nursery Plots of Unshiu Orange

Inn Shik Myung, Ki Woong Nam, Hyeog Mo Kwon

Abstract

Dispersal of citrus bacterial canker caused by Xanthomonas axonopodis pv. citri on Unshiu orange was investigated in naturally infested nursery plots at Seogwipo in Jeju island, Korea. Based on phage detection, over 2% of the bacterial pathogen overwintered in canker lesions and started to multiply in late May. However, symptoms were first observed 1 month after the phage detection. The disease dispersed non-directionally to nearby plants possibly because of indirect dissemination of the bacterium by rain splashes. The disease increased from late June to late August and decreased thereafter. Population of phage increased constantly, however, disease occurrence somewhat fluctuated due to environmental factors. Disease incidence and severity were correlated with rainfall with wind that occurred 14-32 days earlier from late May to late August.

Key Words: Bacterial canker, dispersal, Unshiu orange, Xanthomonas axonopodis pv. citri