Abstract

The present study showed the potential risk of coexistence of Verticillium dahliae,Fusarium oxysporum f. sp. tuberosi and Meloidogyne javanica, according to fungal isolates present, on potato culture and the severity of fungal and nematological attacks. A synergistic interaction within agents of the parasitic complex studied was expressed by a reduction in plant growth, an increase in vascular wilt severity, in galling index, in egg masses number and in M. javanica female fecundity. In contrast, opposite effects expressed by a reduction in damages occasioned and in nematode reproductive potential, reflected some cases of antagonism within certain bi- and/or tri-partite complexes studied. An inter- and intra-specific variation within fungal isolates studied was observed and it seems to strongly affect the type of existent interactions within several various parasitic complexes studied.

Key words: Solanum tuberosum L., mixed inoculation, root-knot nematode, vascular pathogens, incidence, galls, fecundity.