Nematode taxonomy and biodiversity

Taxonomical studies and documentation of diversity of plant parasitic, predatory, nematode dysaprobes and entomopathogenic nematodes in Tamil Nadu.

Emerging nematode problems in fruit crops

New invasive nematodes found in Tamil Nadu are identified viz., root knot nematode in guava and citrus, Meloidogyne enterolobii and M.indica respectively and incidence of root knot nematode, M. incognita in pomegranate and mango. Their identity was confirmed and dissemination through nursery planting materials is being sensitized through workshops meant for nursery men, orchardists, fruit growers and extension functionaries.

Root knot nematode, Meloidogyne enterolobii infested guava plant showing wilting and stunting.

Root knot nematode, Meloidogyne indica infested citrus seedling showing die back symptoms and stunting.

Pomegranate plant showing yellowing and shedding of leaves due to root knot nematode infestation.

Root knot nematode infested guava graft.

Dr.K.Poornima, Professor and Scheme incharge participated in a Panel Discussion on “Emergent Nematode Problems-Redefining Management Strategies” on Nov 28-29 2016 at NASC Complex, Pusa campus, New Delhi. A presentation on ’Nematode problem in guava’ was delivered on the first session.

Classical and Molecular characterization of Nematodes

  • Classical characterization was carried out for major root knot nematodes prevalent in Tamil Nadu.
  • Molecular characterization of guava root knot nematode, Meloidogyne enterelobii has been carried out by sequencing the PCR amplified product BY 18s primer.
  • Clover cyst nematode, Heterodera trifolii Goffart, 1932 was recorded from white clover (Pasture legume) in the Nilgiris.
  • Biological control of Plant Parasitic nematodes

  • Fungal and bacterial nematode antagonists have been isolated, formulations were developed for two egg parasitic fungi viz., Purpureocillium lilacinum and Pochonia chlamydosporia and commercialized.
  • Botanicals nematicides

  • Nematicidal and nematostatic botanicals have been screened and most effective ones were formulated namely, Tagetes erecta, Swertenia mahogany and Calatrophis gigantia.
  • Integrated Nematode Management

  • Integrated nematode management modules have been developed for major plant parasitic nematodes.
  • Host Plant Resistance

  • Screening of genotypes / varieties / hybrids / accessions of cereals, pulses, oil seeds and vegetables against major nematodes like root knot, reniform and cyst nematodes are being carried out.
  • Nematode management in polyhouse crops

  • Polyhouse cultivation of crops that includes few vegetables and flower crops is gaining importance in recent years. Continuous cultivation, lack of enough crops to take up crop rotation, presence of conducive microclimate within the structure, lack of challenging chemicals and reuse of soil leaves root knot nematode population at a high end, making them severe and unmanageable after two to three crops.
  • Emtomopathogenic nematodes

  • Studies on increasing the infectivity and efficiency of Entomopathogenic nematodes, Steinernama and Heterorhabditis for biocontrol of major insect pests using stressors (biological and chemical resources) is in progress.
  • Management of weeds by nematodes

  • The distribution of Solanum elaenginifolium, a potential weed in cotton ecosystem is wide spread in dry tracts of Tamil Nadu. Studies on Biomanagement of this weed using Ditylenchus phyllobia (= Orrina phyllobia) a foliar nematode is currently under investigation.
  • Beneficial Role of Nematodes in soil health

  • Role of bacteriovore, fungivore and predatory nematodes in enhancing organic matter decomposition and nutrient mineralization in soil ecosystem is under investigation.
  • Schemes in operation

    Budget Sponsor
    D 32 AL All India Coordinated Research Project on Nematodes in agrcicult 34.33 lakhs ICAR
    E 28 AAS GoI-DST-SERB Development of novel biodegradable beads of bacterial parasite Pasteuria penetrans
    As bio nematicide (PI: Dr.N.Swarnakumari,Assistant Professr)
    21.55 lakhs GoI-DST-SERB
    Venture Capital Scheme Commercial production of nematode antagonistic bioagents 2.93 lakhs ABD, TNAU, Cbe.
    F36OA GoTN-TNFD Exploration of Nematode Biodiversity in Niligiri Forest Ecosystem 5 Lakhs Tamil Nadu Forest Department

    Principle Investigator - Dr. P.G.Kavitha Assistant Professor (Nematology)