Reproductive capacity of seven Nacobbus aberrans populations from Argentina on tomato cultivar ‘Platense’.

LAX, P.; DOUCET, M.E; CORONEL, N.; LUQUE, O.; ROJAS, N.; RAMOS, D.; MUZABER, J.

Villa Carlos Paz, Córdoba

Congreso; XXXIX Reunión Anual de la Organización de Nematólogos de los Trópicos Americanos; 2007

Organización de Nematólogos de los Trópicos Americanos

N. aberrans is widely distributed in Argentina, where it is represented by different populations. The objective of this work was to evaluate the reproductive capacity of 7 populations of the species on the tomato cultivar ‘Platense’. Nematodes were of different origin and were associated with several hosts in different localities: Coronel Baigorria and Río Cuarto (Córdoba), Lisandro Olmos (Buenos Aires), El Pucará del Aconquija (Catamarca), Tunuyán (Mendoza), Lules and Tafí del Valle (Tucumán). Six replications per population were performed by inoculating 100 active second stage juveniles per plant at planting. The experiment was conducted in greenhouse conditions at a mean temperature of 21°C. After 90 days, final density of each population was estimated and Reproduction Factor (RF = final density/initial density) was calculated. While all these populations reproduced on the tomato cultivar, three significantly different group of populations were detected: a) Tafí del Valle (RF=5.5); b) El Pucará del Aconquija, Lisandro Olmos, Coronel Baigorria, and Tunuyán (with RF ranging between 17.2-35.9); c) Río Cuarto and Lules (RF=38.5-46.1). The evaluation of N. aberrans‘reproduction capacity confirms that the species is represented by different biological entities of diverse agronomical importance. This situation requires the development of detailed and accurate strategies to manage the pathogen.