SEASONAL CHANGES IN THE POPULATION DENSITY OF CORANUS AFRICANA EL-SEBAEY IN EGYPT AS INDICATED BY LIFE TABLE PARAMETERS

Document Type : Original Article

Authors

1 Plant Protection Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt.

2 Entomology Department, Faculty of Science, Cairo University, Giza, Egypt

Abstract

Monitoring the changes in the population density of the adult predatory bug, Coranus africana EI-Sebaey (liemiptera-Reduviidae) was carded out from February 1999 till January 2001 in Kom Oshim district which situated in the Western Desert Ago-ecosystem (Egypt). The high­est number of adults was achieved between July and October, while the lowest level of the population was reported between February and March during the two tested successive years. The effect of the prevailing physical environmental factors on the population density and life table parameters was also studied by raising an artificial population of the predator in field cages. This reduviid completed six overlapping genera­tions in a year. The basic life table parameters, expressed as the net re­productive rate (130), gross reproductive rate (GRR), instantaneous rate of natural increase (rm) and the mean generation time (T) were deter­mined with respect to the date of hatching. The average values of these parameters under natural climatic conditions were 81.16, 902.01, 0.3798 and 12.24, for Ro, GRR, rm and T, respectively.

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