Abstract

SUAREZ, Susana A et al. Efecto de diferentes proporciones de Tagetes minuta y Glycine max sobre Meloidogyne incognita. Ecol. austral [online]. 2017, vol.27, n.2, pp.210-218. ISSN 1667-782X.

Root infestation by Meloidogyne incognita (Kofoid and White) Chitwood, in mixtures of Glycine max (L.) Merr. and Tagetes minuta L. was studied through an experiment designed to test how host different proportions influenced nematode reproduction and second generation density. Root-knot density, feeding sites, histological reactions and number of second generation M. incognita in both host species were evaluated. Gall density was higher in treatments where G. max plants were in more than 50%. In roots of T. minuta feeding sites they were found nonfunctional and larvae on these sites did not reach reproductive stage. Density reduction of soil larvae was proportional to the amounts of T. minuta in the mixture. These data indicate that T. minuta infected by nematodes acts as a “trap-plant”, capturing some individuals, many of which will never reach sexual maturity, and reducing second generation density.

Keywords : Histopathology; Mechanisms of deffence; Parasite-host interaction; Survival.