Reação de genótipos de maracujazeiro a Meloidogyne javanica e Meloidogyne incognita raça 3 e a Fusarium solani

Abstract

The objectives of this work were to evaluate the reaction of passion fruit genotypes to Meloidogyne spp and to the complex Meloidogyne incognita race 3 and Fusarium solani. The experiments were carried out in a greenhouse in a randomized block design with six replications in a factorial 9x2 (Passiflora giberti, P. nitida, P. setacea, P. mucronata, P. cincinnata, P. ligularis, P.alata, BRS 'Sol do Cerrado' and selection M19-UFV x Meloidogyne javanica and M. incognita race 3 for the 1" experiment and 10x3, (nine genotypes form the 1" experiment + P. morifolia) x M. incognita race 3, M. incognita + Fusarium solani and F. solani for the 2nd experiment. In the 1" experiment, three days after seedlings transplanting were added to the soil 3,000 eggs of nematodes. In the 2nd one, the plants were inoculated with a suspension of 10 spores / ml of F. solani and 4500 eggs + 500J2 of M. incognita race 3 according to each treatment. The 1" experiment was valued 90 days after inoculation and 2nd 180 days after. For both experiments were evaluated: number of J2/200 cc soil, number of galls, egg masses, eggs per root, the reproduction factor and the reaction of genotypes by means of different criteria. In the 1" experiment evaluated also weight of fresh root and in the 2nd lesion of F. solani. In the 1" experiment, according to the criteria of Oostenbrink and Moura and Regis, the BRS Sol do Cerrado', selecting M-19-UFV and P. alata behaved as immune to M. incognita and P. cincinnata and P. setacea immune to M. javanica. Passiflora cincinnata and P.giberti behaved as resistant to M. incognita and M. javanica, respectively. According to Taylor and Sasser, species classified as immune by other criteria were classified as resistant to nematodes. All of the nematological variables evaluated in P. giberti, P. ligularis, P. mucronata and P. nitida were superior in number in plants infected by M. incognita. The weight of the fresh root of P. ligularis and P. mucronata was lower in the presence of M. incognita in relative to M. javanica. In the 2nd one, only 5 genotypes survived until evaluation. P. giberti showed the highest number of galls, egg masses, eggs, J2 and reproduction factor (RF). According criteria Oostenbrink and Moura and Régis, the BRS 'Sol do Cerrado', selecting M-19-UFV, P. alata and P. cincinnata behaved as resistant to M. incognita race 3. However, P. giberti was considered susceptible and highly susceptible as those criteria, respectively. According to the criteria of Taylor and Sasser, the BRS 'Sol do Cerrado and M- 19-UFV were resistant. P. alata behaved as moderately resistant, P. cincinnata moderately susceptible and P. giberti as susceptible. The genotypes that presented lower percentage of plants with Fusarium symptoms were P. mucronata, P. nitida, P. setacea, P. cincinnata and M-19-UFV. In the presence of the two pathogens, the M-19-UFV, P. alata and P. nitida presented the largest lesions. The BRS 'Sol do Cerrado', P. alata, P. cinccinata and P. ligulares. when inoculated only with the fungus, presented largest lesions.