Are Nematodes a Problem in SRI?
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Are Nematodes a Problem in SRI? . J.S. Prasad, Ch. Padmavathi, R.M. Kumar, and L.V.Subba Rao. Directorate of Rice Research, Rajendranagar, Hyderabad-500 030. INTRODUCTION.

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Are Nematodes a Problem in SRI?

J.S. Prasad, Ch. Padmavathi,

R.M. Kumar, and L.V.Subba Rao

Directorate of Rice Research,

Rajendranagar, Hyderabad-500 030


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INTRODUCTION

  • High yields of rice declined in Brazil and China after 3-4 years under aerobic conditions, possibly due to nematodes or toxic substances (Bouman, 2002).

  • Yield differences between aerobic and flooded rice ranged from 8 to 69%, the differences attributed to the build-up of nematodes (Peng et al., 2006).

  • Under controlled irrigation, even small pest problems have great impacts on yields and farmers' income.


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Nematode pests that could be associated with SRI

Uncontrolled irrigation can be associated with the rice root nematode

Hirschmanniella spp. – yield loss 8-23% (Kuriyan and Sheela, 1981)


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Controlled irrigation can be associated with the root-knot nematode Meloidogyne graminicola -- yield loss 21-64 % (Rao and Biswas, 1973)



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Materials and methods phloem

Field Experiment – Split Plot

Treatments: SRI, Eco-SRI, and Conventional

Varieties: Rasi and Jaya

  • Greenhouse studies

  • Treatments:

  • Continuous flooding

  • Optimum moisture (OM)

  • Flooding & OM alternated at weekly intervals


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H. phloemoryzaein soil as influenced by crop establishment methods


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H. phloemoryzae in root as influenced by crop establishment methods




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Incidence of root-knot nematode at various moisture levels inundated rice field

Figures in parentheses indicate √X+0.5 transformed values


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CONCLUSIONS inundated rice field

  • Under aerobic or saturated conditions, more gall formation on the roots by root-knot nematode was observed

  • In conventional rice cultivation, H. oryzae population is more

  • In SRI fields where no water control is possible, there is need to monitor for the root nematode H. oryzae

  • Existing root knot nematode infection may not express itself, but when aerobic conditions prevail, symptoms do appear


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Possible impact of SRI cultivation on plant parasitic nematodes

  • Use of cono-weeder would destroy the nematodes that have invaded the roots of weed plants

  • The incorporation of weeds and organic nutrients deters movement, migration and infestation by nematode pests

  • Decomposing organic matter promotes beneficial predatory and saprophytic nematode populations


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Thank You parasitic nematodes