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1 results

  • Intraspecific Competition in Sitophilus oryzae (L.) and Sitotroga cerealella (Oliv.) in Grain Sorghum

  • M. E. Hassan Shazali
  • Journal:
    Insect Science and Its Application / Volume 17 / Issue 3-4 / December 1997
    Published online by Cambridge University Press:
    19 September 2011, pp. 357-361
    Print publication:
    December 1997

  • Intraspecific competition in the rice weevil, Sitophilus oryzae (L.) and the angoumois grain moth, Sitotroga cerealella (Oliv.) in grain sorghum was studied in laboratory experiments. Progeny production per female of each of the two species when reared separately, decreased as the initial parent population density increased. The number of progeny produced by Sitophilus oryzae increased to a peak, and then declined sharply with a further increase in initial parent population density, characteristic of a scramble competition. In contrast, the progeny produced by Sitotroga cerealella increased with an increase in parental density to reach a fairly constant maximum (flat topped curve), characteristic of a contest competition. It is concluded that intraspecific competition will not limit the potential of the grain moth S. cerealella of becoming a major pest of stored sorghum.