Abstract

GOMEZ, Lucila et al. Susceptibility of Solanum lycopersicum L. genotypes against Meloidogyne incognita Kofoid & White (Chitwood). Rev. Protección Veg. [online]. 2012, vol.27, n.2, pp.111-116. ISSN 1010-2752.

The resistance/susceptibility of Solanum lycopersicum L genotypes Aro 8484, HA 3063, Caramba and HA 8476 against Meloidogyne incognita Kofoid and White (Chitwood) race 2 and the influence of the nematode on the genotype growths were evaluated in two experiments under semi-controlled conditions. In the first experiment, the genotypes, including a susceptible control tomato Campbell-28, were inoculated with a level of 1,5 J_2. g of soil^-1. Root gall index, was reproduction factor and reproduction index of the nematode were determined for categorizing resistant/susceptible genotypes. In the second experiment, three levels of nematodes (0,5; 1,5 and 2,5 J₂. g of soil^-1) were used. Not inoculated genotypes were established as a control. Both experiments had 10 repetitions and were placed in a green house using a randomized distribution design. A lineal regression analysis was used to establish the relation of nematode levels and the plant growths. All genotypes were susceptible to M. incognita. It was demonstrated that the 60 to 94% of plant growth decrease related to the nematode population increase. The use of genotypes is not recommended in soils infected with M. incognita unless management measures are established for keeping nematode population below 0,5 J₂.g of soil^-1.

Keywords : root-knot nematodes; resistance; susceptibility.

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