Detection of pythium zingiberum causing rhizome rot disease of ginger from soils of surrounding area of continuous indoor cropping for immature rhizome production
Ichitani, T.; Shinsu, T.
Annals of the Phytopathological Society of Japan 47(2): 158-165
The relation of distribution of the pathogen causing rhizome rot disease of ginger in soils adjacent to plastic houses to the disease outbreak in continuous indoor cropping for immature rhizome production was studied. At least 3 spp. of Pythium were found in soils adjacent to plastic houses. P. zingiberum, which is less abundant than the other species, was pathogenic to the younger ginger plants. No definite role of the pathogen for primary infection was found, although the fungus was detected in soils adjacent to the house with a history of rhizome rot disease. The pathogen population decreased rapidly in the dumping place for ginger refuse. The pathogen in sufficient inoculum potentials for disease outbreak was detected most often along the drainage canal where ginger rhizomes were washed.