On the southwest Pacific Coast of Colombia, a field study was initiated to determine the human-vector association between Anopheles (Kerteszia) neivai and fishermen, including their nearby houses. Mosquitoes were collected over 24-h periods from mangrove swamps, marshlands and fishing vessels in three locations, as well as in and around the houses of fishermen. A total of 6,382 mosquitoes were collected. An. neivai was most abundant in mangroves and fishing canoes (90.8%), while Anopheles albimanus was found indoors (82%) and outdoors (73%). One An. neivai and one An. albimanus collected during fishing activities in canoes were positive for Plasmodium vivax , whereas one female An. neivai collected in a mangrove was positive for P. vivax . In the mangroves and fishing canoes, An. neivai demonstrated biting activity throughout the day, peaking between 06:00 pm-07:00 pm and there were two minor peaks at dusk and dawn. These peaks coincided with fishing activities in the marshlands and mangroves, a situation that places the fishermen at risk of contracting malaria when they are performing their daily activities. It is recommended that protective measures be implemented to reduce the risk that fishermen will contract malaria.

Muchas especies de plantas superiores producen metabolitos secundarios, a los cuales se les atribuye funciones ecologicas y de defensa contra microorganismos y fitofagos. El objetivo de este trabajo fue conocer la susceptibilidad de larvas de Ae. aegypti y An. albimanus a dos tipos de extractos de acetogeninas obtenidos de semillas de Annona muricata. Las dos especies de Culicidae estudiadas fueron altamente susceptibles a ambos tipos de extractos bajo condiciones de laboratorio. Las concentraciones letales medias (CL50) para los extractos polar, no polar y mezcla de acetogeninas para Ae. aegypti fueron de 74,7 ppm, 236,2 ppm y 20,3 ppm, respectivamente, mientras que en An. albimanus fueron de 0,8 ppm, 16,2 ppm y 1,4 ppm. Se presentan las dosis diagnosticas y su respectivo rango de variacion. Las diferencias entre la mortalidad producida por los extractos no fueron estadisticamente significativas. Una eleccion para su utilizaciòn, podra ser determinada posteriormente cuando se evalùe la residualidad de ambos compuestos y la relaciòn costo beneficio.

Many species of higher plants produce secondary metabolites, to which ecological functions and defense against microorganisms and phytophages are attributed. The objective of this work was to understand the susceptibility of Ae. aegypti and An. albimanus larvae to two types of acetogenins extracts obtained from seeds of Annona muricata. The two species of Culicidae studied were highly susceptible to both kinds of extracts under laboratory conditions. The mean lethal concentrations (CL50) for the polar, nonpolar and mix of acetogenins extracts for Ae. aegypti were 74,7 ppm, 236,2 ppm and 20.3 ppm, respectively, while in An. albimanus they were 0,8 ppm, 16,2 ppm and 1,4 ppm. The diagnostic doses are presented with their respective range of variation. The differences in mortality produced by the extracts were not statistically significant. An option for its use could eventually be determined when the residuality of both compounds and the costbenefit ratio are, evaluated.

The daily man-biting activity of Anopheles (Nyssorhynchus) albimanus and An. (Kerteszia) neivai was determined in four ecologically distinct settlements of the Naya River, Department of Valle, Colombia. Differences were found among the settlements with respect to the mosquito species present, intradomiciliary and extradomiciliary biting activity and population densities.