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<p>Root-knot nematodes (<i>Meloidogyne </i>spp.) pose a&#xa0;major constraint to guava cultivation in Punjab, causing severe yield and quality losses. The present study aimed to evaluate the efficacy of organic soil amendments and chemical nematicides against root-knot nematodes under both <i>in vitro</i> and field conditions. Two soil amendments (neem cake and mustard cake) and three nematicides (carbofuran 3G, fluensulfone 2% GR, and fluopyram 34.48% SC) were assessed for their effect on egg hatching and juvenile (J<sub>2</sub>) mortality. Both organic amendments significantly suppressed egg hatching and juvenile survival, with mustard cake at 15% concentration exhibiting maximum inhibition (72.54% egg hatching inhibition and 76.62% juvenile mortality). Among the chemical nematicides, fluopyram showed complete inhibition of egg hatching and 100% juvenile mortality at ≥ 50 ppm concentration, followed by fluensulfone. Field trials further confirmed fluopyram as the most effective treatment, resulting in 89.72% reduction in soil nematode populations, followed by fluensulfone (82.92%) and mustard cake (74.41%). These results underscore the practical utility of fluopyram and mustard cake as effective and reliable tools for integrated management of root-knot nematodes in guava, with clear implications for sustainable orchard-level disease management.</p>

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Comparative Efficacy of Organic Amendments and Chemical Nematicides Against Root-Knot Nematode in Guava

  • 期刊论文

  • 发表日期：

    2026年1月19日

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  • Priyanka Negi,
  • Anita Arora,
  • Sukhjeet Kaur,
  • Amrinder Kaur,
  • Anupam Sekhon,
  • Sandeep Singh

摘要

Root-knot nematodes (Meloidogyne spp.) pose a major constraint to guava cultivation in Punjab, causing severe yield and quality losses. The present study aimed to evaluate the efficacy of organic soil amendments and chemical nematicides against root-knot nematodes under both in vitro and field conditions. Two soil amendments (neem cake and mustard cake) and three nematicides (carbofuran 3G, fluensulfone 2% GR, and fluopyram 34.48% SC) were assessed for their effect on egg hatching and juvenile (J2) mortality. Both organic amendments significantly suppressed egg hatching and juvenile survival, with mustard cake at 15% concentration exhibiting maximum inhibition (72.54% egg hatching inhibition and 76.62% juvenile mortality). Among the chemical nematicides, fluopyram showed complete inhibition of egg hatching and 100% juvenile mortality at ≥ 50 ppm concentration, followed by fluensulfone. Field trials further confirmed fluopyram as the most effective treatment, resulting in 89.72% reduction in soil nematode populations, followed by fluensulfone (82.92%) and mustard cake (74.41%). These results underscore the practical utility of fluopyram and mustard cake as effective and reliable tools for integrated management of root-knot nematodes in guava, with clear implications for sustainable orchard-level disease management.