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Parasitization Potential of Two Cephaline Gregarines, Leidyana subramanii Pushkala and Muralirangan and Retractocephalus dhawanii sp. n. on the Tobacco Grasshopper, Atractomorpha crenulata (Fab.)

S. Johny, M. C. Muralirangan and K. P. Sanjayan
Journal of Orthoptera Research
No. 9 (Nov., 2000), pp. 67-70
Published by: Orthopterists' Society
DOI: 10.2307/3503635
Stable URL: http://www.jstor.org/stable/3503635
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Parasitization Potential of Two Cephaline Gregarines, Leidyana subramanii Pushkala and Muralirangan and Retractocephalus dhawanii sp. n. on the Tobacco Grasshopper, Atractomorpha crenulata (Fab.)
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Abstract

Two native parasites of eugregarines viz. Leidyana subramanii and Retractocephalus dhawanii sp. n. from grasshoppers were evaluated for their pathogenicity on Atractomorpha crenulata (Fab.) in the laboratory. Third instars of A. crenulata were reared on castor leaves treated with different concentrations (0, 2× 103, 2× 104 oöcysts/grasshopper) of the purified oöcysts of the gregarines. Mortality rate, food consumption and mean body weight were recorded after 20 days of oöcyst inoculation. Though mortality rates were low in gregarines infected grasshoppers, parasitization reduced food consumption as well as body weight considerably compared to the control, indicating possible long-term significance.

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