OAR@ICRISATPlant-parasitic nematodes associated with groundnut in North VietnamS BSharmaauthorM RSiddiqiauthorN VVanauthorN XHongauthorDistribution of plant-parasitic nematodes in coastal, midland hilly, and riverbed delta in Nghe An province in North Vietnam was appraised in April 1993. Thirty-one nematode species within 21 genera were identified associated with groundnut in 25 villages in 5 districts. Macroposthonia ornata, Tylenchorhynchus annulatus, and Pratylenchus species were the most frequently associated nematodes. M. ornata was considered most important because of its incidence in 93% of the surveyed region; it was predominant in 32% of the locations. Swelling of the apical parts of groundnut roots was common and M. ornata was suspected of being linked with 'apical gall' symptoms. T. annulatus was present in 80% of the samples but its population density was normally low (less than 0.5 nematodes per cm³ soil). Pratylenchus brachyurus and P. zeae varied in their distribution; P. brachyurus was widespread in sandy coastal soils while P. zeae populations preferred loamy soils in the midland hilly region. Cysts of Heterodera species were found in soil samples in 43% of locations, but groundnut roots were free from cysts. Meloidogyne graminicola, M. javanica, and Meloidogyne sp. were found in 77% of locations surveyed. Populations of these species were suspected to affect the rice production. Incidentally, 21 of the species identified are being reported for the first time in association with groundnut in Vietnam, and 8 of them have not previously been reported in association with groundnut in any country.Groundnut1994Afro-Asian Society of NematologistsArticle

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