Trees with larvicidal activity may be found in Thailand. We conducted this study to evaluate the efficacy and length of efficacy of Thai neem (Azadirachta siamensis) oil emulsion and an alginate bead of Thai neem oil formulation against early fourth stage Aedes aegypti larvae using a dipping test. The Thai neem oil emulsion had significantly greater larvicidal activity than the alginate bead fo...

The leaf extract of Cassia fistula with different solvens viz, methanol, benzene and acetone were studied for the larvicidal, ovicidal and repellent activity against Aedes aegypti. The extract exhibited dose dependent activity and produced significant mortality. The 24 h LC50 concentration of the extract against Aedes aegypti were observed at 10.69, 18.27 and 23.95 mg/l respectively. Mean perce...

A large number of source materials were collected for isolating entomopathogenic bacteria from larval mosquito habitats in Kirinyaga District, Kenya. Mosquito-toxic bacteria were included among the numerous types of microorganisms isolated from the habitats. The pathogenic isolates shared common structural characteristics; they were gram-positive, spore-forming bacilli that produced parasporal ...

BACKGRAND The genus Ajuga, belongs to Lamiaceae family, is one of the exclusive subspecies in the flora of Iran. The plants of this genus are used traditionally for treatment of joints pain, gout, jaundice, and as insecticide. METHODS larvicidal activity of methanol 80% extract and partition fractions of hexane, chloroform, and ethyl acetate obtained from aerial parts of Ajuga chamaecistus su...

Microbe mediated synthesis of silver nanoparticles (AgNPs) constitutes a reliable, eco-friendly approach ameliorating green-chemistry principles. In this study, stable silver nanoparticles were synthesized by exposing aqueous silver ions to extracellular exudates of B. subtilis A1 under optimized laboratory conditions. The synthesized nanoparticles were characterized by spectroscopic and micros...

Bacillus sphaericus is a spore-forming aerobic bacterium, several strains of which are pathogenic for mosquito larvae. During sporulation, the most active strains produce a crystal toxin with a high degree of larvicidal activity. The toxin is composed of two proteins of 51.4 and 41.9 kDa, which are encoded by highly conserved chromosomal genes. After B. sphaericus is ingested, these proteins ar...

An attempt is made in the present study to analyse larvicidal activity of Haridra and Tulsi against Aedes Anopheles larvae. Larval bioassays were carried out at different concentrations 50-500ppm. The larval mortality fourth instar larvae A. aegypti after 24h treatment was observed separately control, 50, 62.5, 100, 150, 250, 300 500 ppm concentrations. Based on Probit analysis, Significant eff...

We evaluated the larvicidal activity of the granular formulation of Bacillus thuringiensis israelensis (Bti) serotype H-14 (Vectobac G, 200 ITU/mg) and Bacillus sphaericus (Bsph) serotype H5a5b (Vectolex CG, 670 Bs ITU/mg) against Anopheles arabiensis and other mosquitoes in breeding habitats in 3 sites, Gash-Barka, Anseba, and Debub zones, in Eritrea. The primary objective was to determine the...

BACKGROUND The resistance status of malaria vectors to different classes of insecticides used for public health has raised concern for vector control programmes. Alternative compounds to supplement the existing tools are important to be searched to overcome the existing resistance and persistence of pesticides in vectors and the environment respectively. The mosquitocidal effects of Glycosmis p...