Polymorphic Adaptation in Biology and Life-Table Studies of Rhynocoris marginatus (fabricius) OnEarias vittella (fabricius)


  • St. Xavier's College, Entomology Research Unit, Tamil Nadu, 627002, India


Life tables of three morphs of Rhynocoris marginatus (Fabricius) (niger. nigrosanguineous and sanguineous) on the spotted bollworm Earias vittella (Fabricius) were constructed in the laboratory. Maximum fecundity and longevity were observed in niger morph followed by nigrosanguineous and sanguineous morphs. The intrinsic rates of natural increase were 0.034, 0.028 and 0.026 per female per day for niger, nigrosanguineous and sanguineous morphs, respectively. The population multiplication of the niger morph was comparatively higher than that of nigrosanguineous and sanguineous morphs in the cohort generation time. The life expectancy (ex) of newly laid eggs decreased with increasing age in all the morphs.


Development, Life Tables, Morphs, Rhynocoris marginatus.

Subject Discipline

Agriculture Sciences

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