(1975). DDT-resistance status and the effects of DDT exposure in relation to the vectorial capacity of Aedes aegypti(L.) for Brugia pahangi (Buckley and Edeson) Annals of Tropical Medicine & Parasitology: Vol. 69, No. 4, pp. 493-501.

DDT-resistance status and the effects of DDT exposure in relation to the vectorial capacity of Aedes aegypti (L.) for Brugia pahangi (Buckley and Edeson).

Two bacterial insecticides,Bacillus thuringiensis H-14 andB. sphaericus 1593 were evaluated for larvicidal potency against mosquito larvae ofAedes aegypti. LC50 values showed thatB.thuringiensis H-14 (4×105 spores/ml) had a higher pathogenicity against fourth larval instars ofA. aegypti thanB. sphaericus (3.1×106 spores/ml) by about 7.75 times. Larval selection with LC90 of both pathogens for 8 successive generations caused a decrease in the susceptibility levels of selected strains ofA. aegypti as compared with the original strain. Moreover, the results indicated that the effect of larval selection with the above bioinsecticides led to an obvious reduction in the egg production and hatchability of eggs produced by mosquito adults that developed from surviving larvae.

Effect of larval selection with two bioinsecticides on susceptibility levels and reproductive capacity ofAedes aegypti (L.)

DDT susceptibility and selection of the larvae of a laboratory-colony of Culex gelidus Theobald.

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DDT susceptibility and selection of the larvae of a laboratory-colony of Culex gelidus Theobald.