Nacobbus aberrans (Thorne, 1935) Thorne & Allen, 1944 in Argentina

DOUCET, M.E.; LAX, P.

Brisbane, Australia

Congreso; Fifth International Congress of Nematology.; 2008

In Argentina, the false root-knot nematode is represented by populations with origin in cultivated and uncultivated areas. The sites where the species is found are located in very diverse geographical areas that are subjected to highly different conditions and climates. There seems to be some correlation between each one of these populations and their geographical origin as well as the host on which they multiply. Clear differences among populations have been observed so far through comparisons that considered diverse parameters. Thus, for example, based on morphometrical characters, grouping of populations raised on the same host have been detected. Furthermore, a genetic structure analysis showed that populations tended to group together according to their original host, revealing a certain degree of similarity among populations originated in the same host. When considering the evaluation of the reproductive capacity of populations multiplied on different plants under controlled conditions, different behaviours were observed. Such differences were recorded both among populations for a single host and among plants for a single population. These studies confirm the existence of biological entities of different agricultural importance within the species that would show preferences for certain hosts. The great variability that N. aberrans shows in relation to its host/s indicates the need for detecting an accurate differential host test that will be useful to establish suitable management strategies and to gain knowledge on associations between populations.