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<p>Continued monocropping practiced by commercial farmers in protected nethouses provides the ideal environment for crop growth but makes it more vulnerable to infection by plant-parasitic nematodes. With the objective to assess the development of plant-parasitic nematodes in nethouses, a pre-plant assessment of the nematode community was undertaken indicating the presence of 56 nematode genera in the 26 nethouses with 1/3rd being plant feeders. This was followed by a study of the population density development of the prevalent plant-parasitic nematodes on tomato plants in six nethouses during three consecutive years. The genus <i>Meloidogyne</i> (root-knot nematodes) was the most prevalent genus consisting of a mixture of three or four species: <i>M. arenaria, M. enterolobii, M. incognita</i> and <i>M. javanica</i>. The tomato rootstocks ‘RS3’ and ‘RS13’ appeared to be least susceptible to <i>Meloidogyne</i> infection. The highest population densities of <i>Meloidogyne</i> were observed in sandy soils. Higher values of Ca, K and pH were correlated with lower relative population densities (RPD%) of <i>Meloidogyne</i> and <i>Pratylenchus</i>, while higher values of %Mg and Mg:K were correlated with higher RPD% of <i>Meloidogyne</i> and <i>Pratylenchus</i>. The usefulness of the <i>I</i><sub>Ca</sub>/<i>I</i><sub>Mg</sub> ratio to monitor the application of nutrients affecting the susceptibility of tomato plants to <i>Meloidogyne</i> infection should be further investigated.</p>

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Prevalence of plant-parasitic nematodes in nethouse tomato production in Limpopo Province, South Africa, and relationships with physico-chemical soil properties

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  • 发表日期：

    2025年8月12日

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  • Francinah Lesego Matlala,
  • Hendrika Fourie,
  • Wiam Haddad,
  • Dirk De Waele,
  • Mieke Stefanie Daneel

摘要

Continued monocropping practiced by commercial farmers in protected nethouses provides the ideal environment for crop growth but makes it more vulnerable to infection by plant-parasitic nematodes. With the objective to assess the development of plant-parasitic nematodes in nethouses, a pre-plant assessment of the nematode community was undertaken indicating the presence of 56 nematode genera in the 26 nethouses with 1/3rd being plant feeders. This was followed by a study of the population density development of the prevalent plant-parasitic nematodes on tomato plants in six nethouses during three consecutive years. The genus Meloidogyne (root-knot nematodes) was the most prevalent genus consisting of a mixture of three or four species: M. arenaria, M. enterolobii, M. incognita and M. javanica. The tomato rootstocks ‘RS3’ and ‘RS13’ appeared to be least susceptible to Meloidogyne infection. The highest population densities of Meloidogyne were observed in sandy soils. Higher values of Ca, K and pH were correlated with lower relative population densities (RPD%) of Meloidogyne and Pratylenchus, while higher values of %Mg and Mg:K were correlated with higher RPD% of Meloidogyne and Pratylenchus. The usefulness of the ICa/IMg ratio to monitor the application of nutrients affecting the susceptibility of tomato plants to Meloidogyne infection should be further investigated.