Resistance of sweet potato clones to meloidogyne incognita races 1 and 3

Abstract

The objective of this study was to evaluate sweet potato clones for resistance to root-knot nematode, Meloidogyne incognita races 1 and 3. For each nematode physiological race, a greenhouse experiment was set up in a randomized block experimental design with three replications and six plants per plot. Fifty-eight sweet potato clones from the UFVJM germplasm bank were evaluated, plus five commercial cultivars (Brazlândia Rosada, Brazlândia Branca, Palmas, Princesa and Coquinho), plus the cv. Santa Clara tomato (susceptible to Meloidogyne spp.). Stems were planted in 72-cell expanded polystyrene trays, filled with commercial substrate and inoculated with the pathogen thirty days after planting. Forty-five days after inoculation, the eggs were extracted, counted, and later evaluated. Resistance level classification was performed based on reproduction factor (RF) and reproduction index (RI). Among the 63 analyzed clones, a percentage of 78% were classified as resistant to M. incognita race 1.79% to race 3 and 67% showed multiple resistance to both M. incognita races.

Penetration and Development of Meloidogyne javanica on Four Pistachio Rootstocks and Their Defense Responses

“…According to Roberts (2002) , resistance of plants against nematodes refers to the ability of the plants to inhibit the development or reproduction of nematodes. The GI and EMI are considered good guides to evaluate resistance via the measurement of nematode establishment and reproduction in the host, respectively ( Gomes et al, 2015 ). Soares et al (2018) urged that the RF is a reliable factor in selecting resistant genotypes because it considers the final and initial populations of the nematode.…”

Yield responses of 12 okra cultivars to southern root-knot nematode (Meloidogyne incognita)

“…The use of resistant cultivars and nematicides are the main strategies to abate yield losses caused by this nematode (Gomes et al 2015;Silva et al 2015). The application of nematicides, though very effective, is not attractive to farming community due to their high costs and hazardous effects (Mukhtar et al 2013c).…”

“…Incidence and severity of wilt diseases caused by fungi and bacteria have been reported to increase in many crops by root-knot infections (Shahbaz et al 2015; TariqKhan et al 2016). The yield losses caused by root-knot nematodes are due to the build-up of inoculum of this pathogen (Kayani et al 2013) and continuous growing of similar okra varieties in the same field year after year (Hussain et al 2011).The use of resistant cultivars and nematicides are the main strategies to abate yield losses caused by this nematode (Gomes et al 2015; Silva et al 2015). The application of nematicides, though very effective, is not attractive to farming community due to their high costs and hazardous effects (Mukhtar et al 2013c).…”

Resistance of ten common medicinal plants to the root-knot nematode Meloidogyne javanica

“…Susceptibility of medicinal plants to parasitic nematodes vary between the spe-al., 1984) and selection of resistant sources of diff erent plants to root-knot nematodes (Talwana et al, 1997;Cervantes-Flores et al, 2008;Marchese et al, 2010;Mudiope et al, 2012;Gomes et al, 2015;Karuri et al, 2017).…”