RESPUESTA DE GENOTIPOS DE SOLANáCEAS FRENTE A Meloidogyne incognita (KOFOID Y WHITE) CHITWOOD RAZA 2 Y M. arenaria (NEAL) CHITWOOD

the resistance/susceptibility of six solanaceous genotypes to meloidogyne incognita race 2 and m. arenaria were assessed, under a range of population densities (0,5, 1,5 and 2,5 eggs - j2.g of soil-1) of both nematodes. the plants were grown in pots in a greenhouse. the tomato variety campbell-28 was used as a susceptible control. the gall index, reproductive index and reproductive factor were the parameter evaluated to assign a resistance/susceptible category of the genotypes according to the established methodology. s. torvum and s. erianthum were immune to m. incognita whereas they were highly resistant to m. arenaria with no significant differences at any inoculum level. s. mammosum responded as highly resistant to both populations but the efficiency was negatively affected by the highest level of m. incognita. the tomato cultivars motelle and rossol were also highly resistant to m. incognita. d. stramoniun was classified as immune to both m incognita and m. arenaria populations as no symptoms or reproduction of the nematode were observed on its roots. m. arenaria population appeared to be more virulent than the population of m. incognita race 2. the reaction of the genotypes and nematodes, as well as the possible use of the genotypes as stocks for grafting are discussed.