Abstract
The host status of eighteen progenies (CRP 01-12 to CRP 16-12, CRP 19-12 and CRP 20-12) and two cultivars (FB 200 Yellow Master and FB 300 Araguari) of yellow passion fruit to Meloidogyne incognita race 2 was evaluated in a greenhouse experiment. The height and the biomass of the plants, besides the numbers of galls, eggs and second-stage juveniles in roots and soil were assessed after 70 days of cultivation of the genotypes and tomato (control) in plastic pots with 2 kg of soil infested with 5,000 eggs of the nematode. The reproduction factor of the pathogen (RF = Final population/Initial population) was calculated for classifying the genotypes as immune (RF = 0), resistant (RF < 1) or susceptible (RF ≥ 1). The cultivar FB 200 is resistant to M. incognita race 2 and can be cultivated in areas infested with this nematode.
Highlights
The yellow passion fruit (Passiflora edulis Sims) is grown in almost all states of Brazil, especially on small farms
The inoculum of M. incognita race 2 was obtained from pure populations maintained in tomato
For the criterion proposed by Taylor and Sasser (1978), all genotypes and cultivars can be considered resistant, since the gall index (GI) was equal to zero
Summary
The yellow passion fruit (Passiflora edulis Sims) is grown in almost all states of Brazil, especially on small farms. The Brazilian passion fruit productivity is still low (Reis et al 2012), and the occurrence of diseases is one of the main drivers of this scenario. Defoliation, delay in fruit ripening and reduced pulp yield are some of the symptoms caused by pathogens of passion fruit that reduce the production and fruit quality. The passion fruit grows in the same area of cultivation for several years. Soil-borne pathogens that attack the root system of the plant, such as root-knot nematodes The species Meloidogyne incognita (Kofoid and White) Chitwood is one of the most widespread and aggressive, with the largest host range, in which the passion fruit is included (Moens et al 2009, Fisher et al 2010, Rocha et al 2013)
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