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Distribution analyses of Meloidogyne spp. and Pratylenchus coffeae sensu lato in coffee plots in Costa Rica and Guatemala

Hervé G., Bertrand B., Villain L., Licardié D., Cilas C.. 2005. Plant Pathology, 54 (4) : p. 471-475.

DOI: 10.1111/j.1365-3059.2005.01206.x

The distribution of the plant-parasitic nematodes Pratylenchus coffeae sensu lato and Meloidogyne spp. were studied in two plots, one in Guatemala (P. coffeae and M. paranaensis) and the other in Costa Rica (P. coffeae and M. exigua). The quantity of nematodes per g fresh weight root were counted for each coffee tree sampled. The distributions were aggregated, and generally fitted well to negative binomial distributions. Population aggregation was greater when a smaller number of nematodes were involved, suggesting that initial colonization develops in foci. Analyses of the relationships between population levels of the species suggested that there was competition between Pratylenchus coffeae and Meloidogyne spp. This competition was expressed differently depending on the relative population density of the different species.

Mots-clés : coffea; pratylenchus coffeae; meloidogyne; guatemala; mexique

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