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Differential effects of Bacillus sphaericus strain 2362 on Culex quinquefasciatus and its competitor Culex cinereus in West Africa
Author(s) -
NICOLAS L.,
DOSSOUYOVO J.
Publication year - 1987
Publication title -
medical and veterinary entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.028
H-Index - 82
eISSN - 1365-2915
pISSN - 0269-283X
DOI - 10.1111/j.1365-2915.1987.tb00319.x
Subject(s) - culex quinquefasciatus , bacillus sphaericus , biology , spore , larva , filariasis , instar , culex , veterinary medicine , strain (injury) , ecology , botany , zoology , bacillales , anatomy , aedes aegypti , bacteria , helminths , medicine , genetics , bacillus subtilis
. The larval susceptibility to Bacillus sphaericus strain 2362 of the non‐man‐biting mosquito Culex cinereus and the urban filariasis vector Culex quinquefasciatus , two competitor mosquitoes in polluted habitats, was compared. In the laboratory, both species ingested a similar amount of B.sphaericus spores when fed c. 2×l0 5 spores per ml for 30 min. However, in the same experiment, third‐instar larvae of Cx quinquefasciatus were reduced by 98% at 24 h exposure while Cx cinereus larvae were only reduced by 6% at 72 h. In the field, preimaginal populations of Cx cinereus ingested, within a week, more than 99% of the applied spores, but showed no significant decrease through 14 days in cesspools treated at 10 g/m 2 of a flowable concentrate of B.sphaericus 23 62 , containing 2times 10 10 spores/g. It is proposed that specific biological control of Cx quinquefasciatus could result from appropriate treatment of breeding‐sites with larvicidal B. sphaericus and competitive displacement by Cx cinereus or other mosquitoes with larvae that are more tolerant of B.sphaericus.