The effects of two widespread environmental pollutants, perchlorate and hexavalent chromium, were assessed on the efficacy of Bacillus thuringiensis subsp. israelensis (Bti) and Bacillus sphaericus (Bsph) against fourth instars of Culex quinquefasciatus Say (Diptera: Culicidae) in 24-h laboratory bioassays. Although 250 mg/liter perchlorate, a level somewhat higher than would be considered ecol...

In the present study, the larvicidal activity of crude extracts from the stem and fruits, their fractions and fresh fruit juice of Duranta repens were assayed against the larvae of Culex quinquefasciatus. The highest larval mortality was found in chloroform soluble fraction of stem (LC50 = 10.75 ppm in 12 h) and ethanol extract of fruits (LC50 = 8.51 ppm 12 h) of Duranta repens against I instar...

Beta-cyfluthrin (OMS 3051), a new synthetic pyrethroid and one of the stereoisomers of cyfluthrin, was studied for insecticidal activity against eight mosquito species. Its larvicidal activity with LC50 values of 5.62 x 10(-5) and 1.19 x 10(-4) mg/l respectively for Culex quinquefasciatus and Aedes aegypti was comparable with that of deltamethrin. This pyrethroid was more effective against the ...

or solid particles with a size in the range of 10–1000 nm. Depending upon the method of preparation, nanoparticles, nanospheres or nanocapsules can be obtained. Controlled release and particle degradation characteristics can readily be modulated by the choice of matrix constituents1. Efficacy of Chrysosporium tropicum, a pathogenic fungus mediated silver and gold nanoparticles was reported agai...

Diflubenzuron is a commonly used larvicide/biocidal substance. The present study aimed to reveal the effects of diflubenzuron on Acetylcholinesterase (AChE) enzymatic activity and liver histopathology mammalian species (rats). animals fed with various doses tissues rats were taken 10th, 20th, 25th, 45th days sixth month. AChE was measured by spectrophotometer. Tissues embedded in Araldite 502 (...