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Journal of Entomology

Year: 2007 | Volume: 4 | Issue: 4 | Page No.: 289-298
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Authors

K. Sahayaraj

P. Selvarj

R. Balasubramanian

Keywords

Research Article

Cell Mediated Immune Response of Helicoverpa armigera Hubner and Spodoptera litura Fabricius to Fern Phytoecdysteron

K. Sahayaraj, P. Selvarj and R. Balasubramanian
The aim of this study to evaluat the immunological impact of the Crude Ecdysone Fractions (CEF) of 3 ferns such as Christella parasitica (L.) H.lev., Pteridium aquilinum (L.) Khun and Hemionitis arifolia (Burm) T. More. on two major polyphagous pests, Helicoverpa armigera Hubner and Spodoptera litura (Fabr.) (Lepidoptera: Noctuidae). The results revealed that the Haemosomic Index (HI) and the Total Haemocyte Count (THC) were higher in control than the experimental insects. Irrespective of the CEF treatment, HI increased gradually from the first day to the fourth day of observation. Similar trend was also observed for the THC. Among the three ferns, C. parasitica highly reduce the HI followed by H. arifolia and P. aquilinum. Six types of haemocytes viz., Prohaemocytes (PR), Plasmatocytes (PL), Granular cells (GR), Spherule cells (SP), Oenocytoids (OE) and Adipohaemocytes (AD) were observed in both pests. Among the six types of haemocytes observed, PL constituted highest percentage control categories of both H. armigera and S. litura population. In ferns treated categories, PR, SP and AD levels of both pests were increased. Among the six types of haemocytes, cellular mediated response was observed only on GR, SP, PR and PL cells, which either underwent lyses or aggregation. Lyses or aggregation were well pronounced in H. armigera than S. litura.
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