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Paralongidor Usa Ustralis N. Sp. (Nematoda: Longidoridae), Causing Poor Growth of Rice in Australia

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Paralongidorus australis n. sp. from soil associated with roots of poorly growing rice in Queensland, Australia is described. It is distinguished from other species of Paralongidorus by the following combination of characters: lips not set off by a constriction, tail broadly rounded, length 7.6-10.6 mm, odontostyle 146-170 μm, guide ring 58-70 μm from anterior end. The symptoms of poor growth of rice are outlined and the results of a pathogenicity test designed to assess the role of P. australis in the disease syndrome are presented. In the field, poor growth is first noticed soon after permanent water is applied; plants become stunted and chlorotic and root tips curl and then become necrotic. Unthrifty plants tend to be overrun by weeds so that badly affected areas yield little or no grain. Seedlings of rice (cv. Starbonnet) growing in vials containing 10 g sterilized soil and inoculated with 250 and 900 P. australis were shorter than uninoculated seedlings and showed root symptoms similar to those observed in the field. This suggested that P. australis was the primary cause of the poor growth syndrome of rice.

Affiliations: 1: Plant Pathology Branch, Queensland Department of Primary Industries, Indooroopilly, 4068, Queensland, Australia; 2: Wellclose, via Charleville, 4470, Queensland, Australia


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