Five original strains of entomopathogenic bacteria with insecticidal activity against mosquito larvae of the genera Aedes, Culex and Anopheles have been isolated from natural conditions in Armenia and characterized. According to morphological, physiological and biochemical parameters, all isolates were identified as Bacillus thuringiensis spp. israelensis (Bti). High larvicidal activity has bee...

Two insect growth regulators, methoprene and a benzyl-1,3,benzodioxole (J-2931), had no detrimental effects on Dugesia tigrina under field conditions. Three other compounds, resmethrin, temephos, and cyromazine, had only minimal effects. Asexual multiplication among these planarian predators exceeded 68% when combined with Culex quinquefasciatus larvae and methoprene at different concentration ...

The present study indicates the efficacy of extracts and fractions of Quercus lusitania var. infectoria galls (Oliv.) as larvicidal agents and their possible use in biological control of Culex pipiens, the urban nuisance mosquito. Extracts and fractions were tested against second and fourth instar larvae. The LC(50) values of gallotannins were 335 and 373 ppm, respectively for the 2nd and 4th i...

The Oomycete fungus Crypticola clavulifera was pathogenic for laboratory-reared and field-collected larval Diptera, including the mosquitoes Aedes aegypti, Ae. notoscriptus, Anopheles farauti No. 1 and 3, Culex annulirostris, Cx. quinquefasciatus and the chironomid midge Chironomus tepperi. Zoospores were produced in water held at 15, 20 and 25 degrees C and were pathogenic for Ae. aegypti larv...

Background and Objectives. Entomological survey was carried out from May-June to September-October 2014 to investigate the presence of dengue vectors in discarded tires and artificial water containers in houses and peridomestic areas. Methods. A cross-sectional immature stage survey was done indoors and outdoors in 301 houses. Mosquito larval sampling was conducted using pipette or dipper depen...

Francisella tularensis is an environmental bacterium capable of infecting a wide spectrum of species from mammals and birds to reptiles. It has been demonstrated that F. tularensis can invade and survive within protozoa, but an association with aquatic insects has not been thoroughly investigated. We examined the interaction of F. tularensis LVS biofilms and Culex quinquefasciatus larvae to det...

A simple technique for seeking natural predators to mosquito larvae was developed. In the present study, adult backswimmers, a natural predator to mosquito larvae, were used as a model. The adult predators were fed with larvae and pupae of Aedes aegypti and tested for the presence of antigens of the mosquito larvae at 1, 2, 4, 6 and 24 hr thereafter. The test was performed using an immunologica...

The aim of this study was to evaluate mosquito abundance, species diversity, larval and adult population dynamics in seven lagoons integrated in the wetland coastal system of the Algarve, Portugal, in the summer of 2007, as well as the screening of these for West Nile virus (WNV). WNV has been isolated from mosquitoes in this region, in the summer of 2004, next to the putative area of infection...

Twelve new triazole derivatives of Phrymarolin were prepared from Phrymarolin I and the structures of all the derivatives were fully characterized by (1)H-NMR, (13)C-NMR and MS spectral data analyses. Larvicidal activities against 4rd instar larvae of Culex pipiens pallens of these Phrymarolin analogues were assayed. Although the triazole derivatives of Phrymarolin showed certain larvicidal act...

In the laboratory, newly hatched fry of Rivulus marmoratus were effective predators on 1st-instar Aedes taeniorhynchus. Adult fish consumed 4th-instar Ae. taeniorhynchus and egg rafts of Culex quinquefasciatus at a rate increasing with standard length of the fish. Predation of Rivulus marmoratus on Ae. taeniorhynchus larvae in the field was documented by observing the passage of larval/pupal re...