Abstract

NAVARRO-BARTHELEMY, L et al. RESPONCE OF TOMATO GENOTYPES (Solanum lycopersicum L.) TO THE PARASITISM OF of Meloidogyne incognita (Kofoid y White) CHITWOOD¹. Rev. Protección Veg. [online]. 2009, vol.24, n.1, pp.54-56. ISSN 1010-2752.

Root-knot nematodes Meloidogyne spp., represent one of the factors that limit vegetable production under sheltered conditions. The hybrids and varieties of tomato produced under this technology are imported and their responses to Meloidogyne incognita Kofoi y White (Chitwood) under these conditions are unknown. The main objective of this work was to evaluate the resistant/susceptibility of tomato hybrids FA 572- Katherine and LT-M12 to M. incognita. The experiment was set up under semi-controlled conditions using potted plants of each genotype and the susceptible crop Cucurbita sp. var. RG5, used as a control of the experiment. The plants were inoculated with 1,5 egg-juveniles per gram of soil with 10 replications per treatment. At sixty days after nematode inoculation, the gall index (GI), the reproduction factor and the reproduction index were determined to categorize the genotypes as resistant/susceptible. Both genotypes showed a low root gall index (GI=2-3) in comparison with the control (GI=5) although they responded very susceptible to M. incognita as they allowed higher reproduction of the nematode in a 50% than the control. The results of this work confirmed that the gall index can not be used as a unique criterion to determine genotype resistance to M. incognita.

Keywords : Solanum lycopersicum; Meloidogyne incognita; resistance; susceptibility.

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