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Description and Biology of Subanguina Chr Ysopogoni Sp. N. (Nematoda), a Parasite of Chrysopogon Ful Vus (Gramineae) in Haryana, India

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Subanguina chrosopogoni sp. n. forming galls on inflorescence of Chrysopogon fulvus (Spreng.) Chiov. in Ambala district of India is described. The main distinguishing features of this new species are: Female: L = 1.653 ±0.166 mm; V = 92.2 ± 1.3; stylet = 7.5 ±0.3 μm; MB = 57.9 ± 4.7 μm; excretory pore = 106 ± 5.3 μm; ovary usually with one flexure, oocytes arranged in multiple rows, crustaformeria in form of four rows of 20-22 cells each; tail ending in a mucronate process. Male: L = 1.186 ± 0.109 mm; a = 41.8 ± 6.1; lateral lines 7-8; stylet = 8.97 ± 0.31 μm; MB = 55.3 ± 6.2 μm; spicule = 31.6 ± 1.4 μm; tail ending in a digitate process. Quiescent third-stage juvenile: L = 0.782 ± 0.0356 mm; MB = 53.2 ± 2.2 μm; tail length = 57.04 ± 3.36 μm, ending in a pointed terminus. Quiescent and infective being different stages of development. Studies on life cycle of this nematode reveal that quiescent third-stage juveniles can survive for more than nine months in a desiccator, refrigerator or at room temperature in air dried galls. They emerge instantly out of galls in water at 0-37°C and moult to fourth-stage juveniles in soil and penetrate growing points of Chrysopogon seedlings. The final moult occurs inside the floral galls. Sexes are separate and reproduction is by amphimixis. The first moult occurs inside the egg and second-stage juveniles moult to third-stage quiescent juveniles inside the gall. Only one generation is completed in a year. Incidence of galls in natural habitats was found to be 2%. Infested plants exhibit no symptoms during the vegetative phase.

Affiliations: 1: Department of Nematology, Haryana Agricultural University, Hisar - 125004, India


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