PAPER TITLE :AGE – RELATED RESPONSIVENESS OF ANOPHELES ARABIENSIS LARVAE (DIPTERA: CULICIDAE) TO BACILLUS SUBTILIS ISOLATED FROM INSECT CADAVERS IN NIGERIA

FUTA JOURNAL OF RESEARCH IN SCIENCE | VOLUME 8 NUMBER 2 2012

Paper Details

  • Author(s) : F. O. Omoya,* B. E. Boboye and F. A. Akinyosoye,
  • Abstract:

Anopheline mosquitoes are exclusive vectors of human malaria and a handful of these species predominate
as the most notorious malaria vectors. Nigeria has been known for its malaria endemic status for more than
three decades. The morbidity and mortality rates associated with the infection despite the various methods
of control are the greatest cause of concern. Bacillus subtilis isolated from Housefly cadavers was tested in
vitro on different larval stages of Anopheles arabiensis to ascertain its larvicidal potency. Second and
fourth instars of Anopheles arabiensis were subjected to varying concentration of Bacillus subtilis for 48
hours. Significant differences were recorded in the susceptibility of the insect instar larvae to Bacillus
subtilis. The LC50 and LC75 of 0.862 mg/ml and 1.245 mg/ml respectively for 2nd instars after 24 hours of
post treatment were recorded, while LC50 and LC75 of 2.36 mg/ml and 4.012 mg/ml respectively were
recorded for 4th instars. Values obtained in Bacillus thurengiensis isrealensis treatment groups were not
significantly different from the tested bacterium.
Keywords: Anopheles mosquitoes, Malaria, Bacillus subtilis, and Bacillus thurengiensis isrealensis.