Aim: The present study was conducted to identify the resistance and susceptibility of beetroot cultivars against root-knot nematode, Meloidogyne javanica. Methodology: In this study, seven beetroot cultivars were screened against the root-knot nematode, Meloidogyne javanica, at the inoculum level of 1500 second-stage juveniles (J2s) per pot. Five replications of each cultivar of beetroot were used for screening and kept in a completely randomized design (CRD) at 25 ± 2 °C under greenhouse conditions. The data were subjected to ANOVA using SPSS-17 statistical software (SPSS Inc., Chicago, IL, USA). According to Duncan’s Multiple Range Test, the mean values were statistically compared and separated at P ≤ 0.05. Results: The results revealed that all seven cultivars of beetroot showed varying degrees of resistance and susceptibility to M. javanica. Among all the cultivars, three were moderately resistant, i.e., CG, DDR and Red Ace with the minimum number of galls (4.0, 8.0 and 7.0), and two were moderately susceptible, i.e., Atlas and Red Queen (28 and 22). Red Ruby (84) was found susceptible and Red Express was highly susceptible with the maximum galls (126). None of the cultivars were found to be highly resistant or immune. Interpretation: A positive and significant correlation was found between the number of galls and per cent reduction in plant growth parameters. From the results, it can be recommended that the use of resistant cultivars is an environment-friendly approach that can be used to manage the nematode density below the economic threshold level.
Aim: The present study was carried out to screen ten cultivars of spinach (Spinach oleracea L.) for their response to Meloidogyne javanica under greenhouse conditions with the aim to exploit them for nematode management programme. Methodology: Ten commonly grown spinach cultivars were tested for their reaction to Meloidogyne javanica by inoculating 2000 second-stage juveniles in pots. Five seeds of each cultivar were surface sterilized with 1.0% NaOCl and sown in sterilized clay pots, placed in a completely randomized design. After three months the experiment was terminated and the plant growth, physiological and nematode infested parameters were evaluated. Results: None of the tested cultivar was immune, highly resistant or resistant to nematode infestation. Cultivars Pusa Bharti and Pahari were moderately resistant whereas Giant, All green and Kaveri were highly susceptible to nematode infestation. Five cultivars Pure green, Solan Harit, Green flavor, Super green and Kantedar were found to be susceptible. Interpretation: Growing moderately resistant cultivar in severely infested field with M. incognita may assist to minimize the root-knot nematode multiplication and thereby, reduce the crop damage below the threshold level. Thus using resistant cultivars against M. incognita can prove to be an environmentally friendly and cost-effective management approach. Key words: Meloidogyne javanica, Root-knot nematode, Spinach cultivars
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