Dabiré Roch K. auteur aut IRD Ndiaye S. auteur aut IRD Mounport D. auteur aut IRD Mateille Thierry auteur aut IRD text journalArticle eng text/pdf born digital access The epidemiology of Pasteuria penetrans, parasite of Meloidogyne javanica, was studied in a field cultivated with an African egg-plant (Solanum aethiopicum) in Senegal. Abiotic and biological parameters were analyzed from 100 soil samples. Soil physical characteristics were studied with principal component analysis (PCA). Similarity between the parameters according to biotic and abiotic variables was established by hierarchical classification and corroborated by Discrimin analysis (AFD). The coarser fractions (> 200 mu m) were positively correlated to intensive irrigation, whereas finest fractions (< 20 mu m) and spores of P. penetrans were abundant in the areas moderately irrigated. Furthermore, the proportion of Pasteuria-infected juveniles was positively correlated to the presence of finest texture and high water holding capacity. The abundance of M. javanica was associated with coarse sands and potassium. Based on these results, laboratory experiments were attempted on the influence of irrigation and soil texture on the distribution of P. penetrans in cultivated and bare soils. The results showed that 53% of the spores inoculated were leached by water flow in the sandy soil, but only 14% in the sandy-clay soil and 0.1% in the clay soil. No nematodes survived in the clay soil, while the population increased both in the sandy and the sandy-clay soils. More M. javanica were infected by P. penetrans in the sandy-clay soil than in the sandy soil. Comparing different combinations of bare soils containing 1.1-57% clay, the best spore percolation/retention balance occurred in soils textured with 10-30% clay. specialized plant parasitic nematodes Meloidogyne javanica Pasteuria penetrans soil abiotic factors relationships 076 40 1 22-29 2007 1049-9644 https://www.documentation.ird.fr/hor/fdi:010037821 10.1016/j.biocontrol.2006.08.001 1049-9644 [F A010037821] https://www.documentation.ird.fr/hor/fdi:010037821 https://www.documentation.ird.fr/intranet/publi/2007/03/010037821.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2007-03-30 2017-08-23 fdi:010037821 fre