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Studies On Host-Parasite Relationships of Rice Stem Nematode, Ditylenchus Angustus (Nematoda: Tylenchida) On Rice, Oryza Sativa, L.*)

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Severity of ufra symptoms on inoculated rice plants and reduction in grain yield increased gradually with the increase of initial inoculum density of Ditylenchus angustus. Placement of infested plant materials in shallow water at the base of 2-3 week old seedlings proved to be the easiest means of inoculation for this nematode in comparison to either soil or leaf-sheath inoculation methods. The active nematodes from the infested plant materials usually insinuated themselves into the leaf-sheath space within one hour but their invasion into the host plant, and consequently the percentage of plants infested, varied with different plant age - the older the plant, the smaller the infestation. Nematodes can migrate successfully from a diseased plant to a healthy one through water, stem and leaf contact under highly humid conditions ( > 75 % R.H.). None of the rice varieties tested were found to be completely resistant to ufra caused by D. angustus.


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