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Reaction of passionfruit varieties to the root-knot nematode, Meloidogyne javanica

2002; Volume: 26; Issue: 1 Linguagem: Inglês

0102-2997

Ravi D. Sharma, N. T. V. Junqueira, A. C. Gomes,

Nematode management and characterization studies

Considering the widespread distribution and the losses the root-knot nematode, Meloidogyne javanica, causes to different crops in the Savannah region of Brazil, reactions of I 1 varieties (EC-2-O Hybrido, Vermelhinho, IAC-comp.Hybrido, MSC, Roxo Australiano, Selecao DF, Longao PR-2, Vermelhao, Redondao PR-1, Roxo Fiji and Itaquirai) of passionfruit (Passiflora edulis f. flavicarpa and P edulis) were evaluated under greenhouse conditions. Five 17-day-old seedlings of each variety were inoculated with approximately 5,250 eggs and second stage juveniles per plant per pot containing one Kg of soil. A tomato variety Santa Cruz was included as a reference check of susceptibility and inoculum viability. Eighty days after nematode inoculation, indices of root-knot galls, indices of egg-masses and final population densities of the nematodes in soil and roots for each variety were determined. The gall index for different genotypes varied from 4.6 to 5.0, the egg-mass index varied from 0 to 2 and the reproduction factor was from 0.001 to 0.061. The reproduction factor for susceptible tomato was 36.17. All passionfruit varieties tested were highly resistant to M. javanica.