Akademik Veri Yönetim Sistemi
JOURNAL OF ECONOMIC ENTOMOLOGY, cilt.88, sa.4, ss.830-834, 1995 (SCI-Expanded)
Bacilllus sphaericus 2362 spore-toxin complex was encapsulated within aluminum carboxymethylcellulose (CMC) and assayed for larvicidal activity against 2nd and 3rd instars of Culex spp. to determine the release properties of the system. Encapsulation of the bacterium exhibited higher stability toward acidic pH, temperature (50 degrees C), and UV irradiation (12 W). The stability of spore-toxin viability detected for the encapsulated pathogen was higher than that for the free bacterium, because the procedure prevented the bacterium from being faced directly with microbial degradation, W and sunlight, temperature, and pH variations. Mortalities in treatments involving incorporation of encapsulated B. sphaericus 2362 into artificial diet of Culex spp. larvae were observed starting from the 48th h after inoculation. Aluminum sulfate (0.05 M) and 1% sodium CMC concentrations were found to be optimum, because higher gellant and polysaccharide levels caused slower release of the bacterium. Our results suggest that the aluminum CMC-encapsulated form of B. sphaericus 2362 can be used more efficiently than its free form in the control of mosquito larvae.