Pratylenchus loosi (root lesion nematode)

Pictures

Picture	Title	Caption	Copyright
Title Symptoms on tea roots Caption The tea roots appear brown and dried up when compared to normal healthy roots, which are succulent and whitish in colour. Larger storage roots display dark brown, necrotic patches or lesions of varying size. Copyright John Bridge/CABI BioScience	Symptoms on tea roots	The tea roots appear brown and dried up when compared to normal healthy roots, which are succulent and whitish in colour. Larger storage roots display dark brown, necrotic patches or lesions of varying size.	John Bridge/CABI BioScience
Title Symptoms in an infested tea field Caption Typical field symptoms of damage caused by P. loosi, in both young and mature tea, include patches of unthrifty tea. Affected plants show spindly growth with sparse foliage. Copyright Nalini C. Gnanapragasam	Symptoms in an infested tea field	Typical field symptoms of damage caused by P. loosi, in both young and mature tea, include patches of unthrifty tea. Affected plants show spindly growth with sparse foliage.	Nalini C. Gnanapragasam
Title Symptoms on young tea plants Caption Infested plants show a marked reduction in the growth of feeder roots. The remaining roots appear brown and dried up when compared to normal healthy roots which are succulent and whitish in colour. Copyright Nalini C. Gnanapragasam	Symptoms on young tea plants	Infested plants show a marked reduction in the growth of feeder roots. The remaining roots appear brown and dried up when compared to normal healthy roots which are succulent and whitish in colour.	Nalini C. Gnanapragasam
Title Symptoms Caption Lesions on the branches of a tea bush. Copyright Nalini C. Gnanapragasam	Symptoms	Lesions on the branches of a tea bush.	Nalini C. Gnanapragasam

Identity

Preferred Scientific Name

• Pratylenchus loosi Loof, 1960

Preferred Common Name

• root lesion nematode

International Common Names

• English: Loos' root lesion nematode; meadow nematode; nematode, Loos' root lesion
• French: anguillule de racines du theier

Local Common Names

• Germany: Nematode, Teewurzel-
• Japan: Tya-negusare-sentyu

EPPO code

• PRATLO (Pratylenchus loosi)

Taxonomic Tree

• Domain: Eukaryota
•     Kingdom: Metazoa
•         Phylum: Nematoda
•             Family: Pratylenchidae
•                 Genus: Pratylenchus
•                     Species: Pratylenchus loosi

Distribution Table

The distribution in this summary table is based on all the information available. When several references are cited, they may give conflicting information on the status. Further details may be available for individual references in the Distribution Table Details section which can be selected by going to Generate Report.

Host plants/Plants Affected

Growth Stages

List of Symptoms

Plant Trade

References

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Basu SD, 1978. Heat the soil and kill nematodes. Two and A Bud, 14:84-85.

Baujard P, Mounport D, Martiny B, 1990. Scanning electron microscopy study of four species of the genus Pratylenchus Filip'ev 1936 (Nemata: Pratylenchidae). Revue de Ne^acute~matologie, 13(2):203-210; 8 ref.

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CABI/EPPO, 2008. Pratylenchus loosi. [Distribution map]. Distribution Maps of Plant Diseases, October (Edition 1). Wallingford, UK: CABI, Map 1042.

Das VM, Sultana S, 1979. Five new species of the genus Pratylenchus from vegetable crops of Hyderabad, (Andhra Pradesh). Indian Journal of Nematology, 9(1):5-14

Gadd CH, 1939. A destructive root disease of tea caused by the nematode, Anguillulina pratensis. Tea Quarterly, 12:131-139.

Gadd CH, 1947. Disease problem. Tea Quarterly, 19:61-64.

Gadd CH, Loos CA, 1946. The problem of nematode control in tea plantations. Tea Quarterly, 18:3-11.

Gnanapragasam NC, 1981. The influence of cultivating Eragrostis curvula in nematode-infested soils, on the subsequent build-up of populations in replanted tea. Tea Quarterly, 50(4):160-162

Gnanapragasam NC, 1982. Effect of potassium fertilization and of soil temperature on the incidence and pathogenicity of the root-lesion nematode, Pratylenchus loosi Loof, on tea (Camellia sinensis L.). Tea Quarterly, 51(4):169-174

Gnanapragasam NC, 1987. Integrated strategies to manage nematodes in tea. Proceedings of the International Conference on Tea Quality and Human Health. China, Hangzhou, November, 1987:117-183.

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Gnanapragasam NC, 1991. Influence of soil amendments in reducing pathogenicity to tea by the root-lesion nematode, Pratylenchus loosi. Proceedings of the International Tea Symposium, Schizuoka, Japan, 684-688.

Gnanapragasam NC, 1995. Nematode Pests of Tea. In: Sivapalan P, Gnanapragasam NC, Kathiravetpillai A, eds. Field Guide Book, Tea Research Institute, Talawakelle, Sri Lanka, 83-87.

Gnanapragasam NC, Manuelpillai MEK, 1981. Relative rates of egg hatch of the root-knot nematode of mature tea, Meloidogyne brevicauda, in relation to other species of this nematode. Tea Quarterly, 50(4):170-171

Gnanapragasam NC, Manuelpillai MEK, 1984. Influence of inoculum level and temperature on the population build-up and pathogenicity of the root-lesion nematode (Pratylenchus loosi Loof) of tea. Tea Quarterly, 53(1-2):19-22.

Gnanapragasam NC, Sivapalan P, 1991. Influence of soil types and storage conditions on the recovery of Pratylenchus loosi from soil samples. Afro-Asian Journal of Nematology, 1(2):150-153; 5 ref.

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Li DZ, 1985. Description of some species of parasitic nematodes of genus Pratylenchus on plant roots in Sichuan Province. Journal of Southwest Agricultural College (Japan), 2:51.

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Mirghasemi T, Seraji A, 2010. Basket grass (Oplismenus compositus) as a new host for tea root lesion nematode, Pratylenchus loosi. Iranian Journal of Plant Pathology, 46(1):Pe91-Pe92, En27. http://www.irjpp.ir/browse.php?a_id=342&sid=1&slc_lang=en

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Park ByeongYong, Choi DongRo, Lee JaeKook, Choi YoungEoun, Shin GilHo, 2002. An unrecorded species of Pratylenchus loosi Loof (Tylenchida: Pratylenchidae) from tea in Korea. Korean Journal of Applied Entomology, 41(4):299-303.

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Distribution Maps

• = Present, no further details
• = Evidence of pathogen
• = Widespread
• = Last reported
• = Localised
• = Presence unconfirmed
• = Confined and subject to quarantine
• = See regional map for distribution within the country
• = Occasional or few reports

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