title: Preparation of a flowable liquid bacterial insecticide based on Bacillus sphaericus.
abstract: Fermenter-produced Bacillus sphaericus 2362 was formulated into a thick, dark flowable liquid concentrate containing 4.8×10(9) c.f.u./ml and charcoal as protector against ultraviolet light. The potencies of the formulation against L4 Culex pipiens quinquefasciatus before and after storage for 2 years were 5714 and 5862 International Toxic Units (ITU), respectively, when compared with a standardized B. sphaericus from the WHO at 1000 ITU. In field trials, treatment at 1.01/ha gave 96 to 100% control of mosquito larvae. B. sphaericus could be re-isolated in 5% of the samples 9 months after application.
authors.affiliation: , .
authors.forename: A O
authors.initials: AO
authors.lastname: Ejiofor
authors.forename: N
authors.initials: N
authors.lastname: Okafor
authors.forename: J
authors.initials: J
authors.lastname: Nwankwo