Hirschmanniella diversa		Contents		Rev 01/09/2024
		Classification		Hosts
		Morphology and Anatomy		Life Cycle
Return to Hirschmanniella Menu		Economic Importance		Damage
		Distribution		Management
Return to Pratylenchidae Menu		Feeding		References
		Go to Nemaplex Main Menu		Go to Dictionary of Terminology

Classification:

        Tylenchina
        Tylenchoidea

         Pratylenchidae

          Pratylenchinae

           Hirschmanniella diversa Sher, 1968

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Morphology and Anatomy:

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Distribution:

Hirschmanniella diversa  like H imamuri, lis an important pest of lotus in Japan..

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Economic Importance:

Important pest in lotus (Nelumbo nucfiera) cultivation in Japan (Takagi et al., 2023).

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Feeding:

Migratory endoparasite of roots.  Juveniles and adults penetrate young root tips on the rhizome. 

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Hosts:

 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,.

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Life Cycle:

Ecophysiological Parameters:

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Damage:

Hirshcmanniells diversa and H, imamuri are considered causal agents of blackening disease or browning tuber disease  Kurokawa-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.

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Management:

Host Plant Resistance, Non-hosts and Crop Rotation alternatives:

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References:

Takagi, M., Sekimoto, S., Mizukubu, T., Wari, D., Akiba, M., Perry, R.N., Toyota, K. 2023. Geographical distribution and phylogenic relationships of Hirschmanniella diversa Sher (Nematoda: Pratylenchidae) in Japan. Nematology 55:45-58.

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Copyright © 1999 by Howard Ferris.
Revised: January 09, 2024.