• Influence of atmospheric conditions and soil temperature on the prevalence of the lance nematode (Hoplolaimus indicus Sher, 1963) in rice fields

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    • Keywords


      Peak period prevalence; lance nematode; Hoplolaimus indicus ; rice soils

    • Abstract


      Studies on the prevalence ofHoplolaimus indicus, the lance nematode in rice fields revealed 4 distinct peaks of population viz., during the second fortnight of February, first fortnight of August and in the second fortnights of October and December during 1971–72. Average soil temperatures of 20·1° to 25·6°C at 5 cm depth were found optimum for the nematode activity. Low atmospheric temperatures of 22·1° to 23·2°C, high relative humidity (83 to 90%) and dew deposition on foliage were found to be conducive for the migration of the nematode from the soil to foliage of standing crops. The migratory behaviour was further confirmed in inoculations to soils with growing rice plants in pot cultures under green house conditions.

    • Author Affiliations


      K V Ramana1 J S Prasad2 Y Seshagiri Rao2

      1. Department of Entomology and Nematology, Andhra Pradesh Agricultural University, Rajendra Nagar, Hyderabad
      2. Central Rice Research Institute, Cuttack - 753 006
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