A wide range of water-holding containers are exploited by mosquito vector as sites for oviposition of eggs and larvae development. The study was aimed at determining the role of the construction industry in promoting mosquito breeding in and around the Accra metropolis, Ghana. A two-month larval survey was carried out at selected construction sites in and around the Accra metropolis. Routine da...

The increasing demand for fresh water has forced many countries to use reclaimed wastewater for agricultural purposes. This water contains pharmaceuticals and personal care products (PPCPs) that remain biologically active following passage through wastewater treatment plants. Run-off from farms and contaminated water from treatment facilities exposes aquatic ecosystems to PPCPs. This study exam...

The survival time (ST) of the preparasitic larvae of Rornanomermis culicivorax was determined by measuring motility at 1, 6, 12, 18, 21, 27, 30, and 37 C; the ST at each of these temperatures was 2.3, 2.2, 2.0, 2.0, 1.7, 1.6, 0.9, and 0.7 days, respectively. About one-third of the preparasites infected first-instar larvae of Culex pipiens within 24 h at 27 C. The preparasites were infective at ...

Two newly developed Bacillus sphaericus larvicidal formulations, VectoLex CG® (corncob granules) and VectoLex WDG® (water dispersible granules), were tested against Culex quinquefasciatus larvae in 4 highly polluted breeding sites in Thailand. VectoLex CG, applies at rates of 0.5-2 g/m2, gave satisfactory to complete control of late-instar larvae and pupae for up to 4 wk after treatment. The Ve...

The insecticidal activity of essential oils isolated from two species of Origanum (Origanum onites L. and Origanum minutiflorum (O. Schwarz and P.H. Davis) (Labiate)) was investigated against 3rd and 4th instar larvae of the mosquito, Culex pipiens L. (Diptera: Culicidae). The LC50 and LC90 values were 24.8 and 61.3 ppm, and 73.8 and 118.9 ppm, respectively. This activity was attributed to the ...

Mosquito collections made on Saipan during September-October 199 1, as part of a retrospective investigation of a Japanese encephalitis (JE) outbreak, are summarized. Forty-two larval habitats were sampled at 21 different sites. Most larvae were individually link-reared to the adult stage. Nine species, representing three genera and five subgenera, were collected. Numerous specimens of Culex tr...

Aquatic prey show behavioral modifications in the presence of predation-risk cues that alleviate their risk from predation. Aedes albopictus (Skuse), Aedes japonicus (Theobald), and Culex pipiens L. are invasive mosquitoes in North America, and their larvae are prey for the native mosquito predator, Toxorhynchites rutilus (Coquillett). Ae. albopictus and Ae. japonicus are recent invaders, where...