Evolution of the fading of citrus fruits in the Mitidja (Algeria)


Abstract: After studies (2006-2009) of the states of fading of citrus fruits in the Mitidja(Algeria), we noted a troubling epidemic evolution in some orchards where the death ratesreached proportions of 5 to 10%. The symptomatologic diagnosis indicates the presence of astrong likeness between the different biotic reasons possible without the presence ofsymptoms typical and/or of revealing signs of the known diseases (bacteria and virus). Thediagnosis of laboratory confirmed their absence. The isolations achieved from the roots andsoil put often in evidence the presence of Fusarium flora dominated by Fusarium solani andFusarium oxysporum species. The implication of these species is joined to the pedologicalfeatures and to the technical practices, notably the irrigation.

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