Russian Journal of Nematology (2002) 10, 99-112

F. Lamberti, S. Molinari, M. Moens and D.J.F. Brown (2002)
The Xiphinema americanum-group. II. Morphometric relationships
Russian Journal of Nematology 10 (2), 99-112
Abstract: Hierarchical cluster analysis based on morphometrics placed 117 populations, representing 39 putative species, of the Xiphinema americanum group into four clusters. Cluster 1 consisted of three populations identified as X. brevisicum; Cluster 2 consisted of five sub-clusters of populations; and Clusters 3 and 4 each consisted of seven sub-clusters. When several populations ascribed to a putative species were used, they usually clustered with a low range of variability, thus confirming their similarity. A population that had been identified as representing X. diffusum and another as being X. incognitum were placed in clusters different from that which characterized the rest of the populations of each species, respectively. Populations identified as X. americanum sensu stricto, X. thornei, X. santos and X. pachydermum were placed in 2 and 3 different sub-clusters within the same major cluster. Conversely, several populations of X. madeirense, X. duriense, X. simile and X. pachtaicum had a low coefficient of dissimilarity (<2.8), which is considered as being indicative of intra-specific variability. Four populations, each identified as representing X. pachydermum, were placed in three different sub-clusters of Cluster 4, thus indicating wide morphometric variability for this putative species.
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Database assignments for author(s): Franco Lamberti, Derek J.F. Brown, Sergio Molinari

Research topic(s) for pests/diseases/weeds:
identification/taxonomy

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Xiphinema (genus)
	Xiphinema pachtaicum
	Xiphinema americanum
	Xiphinema simile