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Investigations on the white tip nematode aphelenchoides besseyi of rice oryza sativa


Investigations on the white tip nematode aphelenchoides besseyi of rice oryza sativa



Indian Journal of Nematology 5(1): 62-69



ISSN/ISBN: 0303-6960

The white-tip nematode usually remains coiled up in a dormant condition on the lodicules and inside the palea of the rice seed. Pre-soaking seeds in water at 28.degree. C for 12-15 h activates the dormant stages before processing for extraction. As the infested seeds sprout, the nematodes reach the tender primordium for feeding and 12 days later, migrate to the leaf as it unfolds. Typical white-tip symptoms on leaves appear on the 16th day after germination. As plants grow, the nematodes move to boot-leaves and panicles causing partial emergence of ears and ill-filled or chaffy grains. A sizable population of adults and 4th-stage juveniles of the nematode reach the ears under conditions of humidity and dew in fields. In controlling the seed-borne infestation, pre-soaking seeds in water at 28.degree. C for 12-15 h, followed by treatment with hot water at 52.degree. C for 10 min was most effective without appreciably affecting the viability of seeds.

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Accession: 005750753

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Related references

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