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Occurrence of Caloosia Heterocephala N. Sp. (Nematoda: Hemicycliophoridae) On Roots of Rice ( Oryza Sativa)

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A species of Caloosia that differs from C. paxi in the shape of its head and tail was found in the rhizosphere of rice under upland soil conditions, and is described and named C. heterocephala. Hatch of the second stage juvenile occurred in 9 days and the adults developed after three moults in 20 days. Juveniles and adults fed in the meristematic tissues of tips and branches of roots, arresting apical root growth. Peak populations of the nematode prevailed during the tillering stage of the standing rice crop. The optimum temperature of soil at 5 cm depth was 27.7° C during the peak prevalence and high numbers of nematodes preceded periods of rainfall.

Affiliations: 1: Central Rice Research Institute, Cuttack 753 006 (India)


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