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Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:
imamuri, lis an
important pest of lotus in Japan..
Migratory endoparasite of roots. Juveniles and adults
penetrate young root tips on the rhizome.
Besides parasitizing Indian lotus, Hirshcmanniells
diversa also parasitizes several weed species that are common in lotus
fields and is considered to have a wide host range in flooded soils,.
Hirshcmanniells diversa and H, imamuri are considered
causal agents of blackening disease or browning tuber disease
â€œKurokawa-Senchu-Byo" in Indian lotus (Nelumbo nucifera). Lotus
cultivars include flowering forms with high value as ornamentals end edible
forms with the rhizome as the edible portion. (Uematsu et al., 2020). Hirschmannielaa
imamuri, like H. oryzae, is also a pasraite of rice.
Lotus is an aquastic plant grown and cultivated in ponds or flooded
fields. Edible lotus rhizomes are an important food source in Japan.
The nematodes are attracted to to young root tips of rhizomes and
create narrow cavities as they invade over a period of 4-5 hours. Host cells
adjacent to the cavitis are destroyed during the during infestation.
Following contact with the nematodes, host cell walls and cellular contents
became electron-dense and less defined, likely due to digestive enzymes
secreted by the invading nematodes. Nematodes invade to a depth of about 1mm
in 24 hr \ but apparently does not penetrate deeper into the rhizome
(Uematsu et al., 2020).. The infection results in blackish-brown
blothces as the rhizome matures.
Host Plant Resistance, Non-hosts and Crop Rotation alternatives: