Quantification of the damage caused by Meloidogyne enterolobii in okra

Abstract

The objective of this work was to estimate the damage caused by Meloidogyne enterolobii in okra (Abelmoschus esculentus) and to verify the reliability of the reproduction factor as a suitable measure for selecting resistant okra genotypes. Increasing populations of M. enterolobii - 0, 500, 1,500, 3,000, 5,000, and 7,000 eggs and second-stage juveniles (J2) per plant, - were evaluated, in a completely randomized design. The pathogen showed a parasitism pattern similar to that of M. incognita, causing a significant decrease in morphological and agronomic traits. The pathogen reproduction factor should be used in the selection of okra genotypes for tolerance to M. enterolobii, in populations above 3,000 eggs or J2.

Management of root-knot nematodes in okra through grafting onto kenaf and false roselle

“…In general, okra is an excellent host for RKN (Silva et al, 2019a), especially for Meloidogyne incognita, whose occurrence and distribution are high in the Brazilian territory (Oliveira et al, 2007;Hussain et al, 2012;Rosa et al, 2013). Meloidogyne javanica and Meloidogyne enterolobii are other important species in the country (Silva et al, 2019a).…”

“…However, there are still no known reports on genetic resistance in commercial okra cultivars or on genetically close materials that could be used in breeding programs safely and effectively (Mukhtar et al, 2014;Prasanna et al, 2022). Although some slightly tolerant materials have been identified (Hussain et al, 2016;Odeyemi et al, 2016;Mukhtar et al, 2017;Afzal et al, 2019), the successive cultivation of these cultivars, despite their acceptable yield level, increases the population of nematodes, not being viable in the medium and long term (Silva et al, 2019a).…”

“…In their studies, Silva et al (2019b) found grafting compatibility between 'Santa Cruz 47' okra and false roselle and kenaf, and Silva et al (2022), between kenaf and the main Brazilian okra cultivars available to growers. However, in these few available studies on okra grafting, compatibility and agronomic performance were observed in the absence of RKN (Marin et al, 2017;Silva et al, 2019a;Andrade et al, 2020). This shows the need to evaluate whether grafting onto Hibiscus spp.…”