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The Romanomermis iyengari parasite for Anopheles pseudopunctipennis suppression in natural habitats in Oaxaca State, Mexico

dc.contributor.authorSantamarina Mijares, Albertoes_ES
dc.contributor.authorPerez Pacheco, Rafaeles_ES
dc.contributor.authorTomas Martinez, Sabino Honorioes_ES
dc.contributor.authorCantón, Luis Enriquees_ES
dc.contributor.authorFlores Ambrosio, Gonzaloes_ES
dc.date.accessioned2015
dc.date.available2015
dc.date.issued1999es_ES
dc.identifier.citationSantamarina Mijares, Alberto,Perez Pacheco, Rafael,Tomas Martinez, Sabino Honorio,Cantón, Luis Enrique,Flores Ambrosio, Gonzalo (1999) The Romanomermis iyengari parasite for Anopheles pseudopunctipennis suppression in natural habitats in Oaxaca State, Mexico. Rev Panam Salud Publica;5(1) 23-28,ene. 1999. Retrieved from http://www.scielosp.org/scielo.php?script=sci_arttext&pid=S1020-49891999000100004&lng=en&nrm=iso&tlng=enes_ES
dc.identifier.urihttp://www.scielosp.org/scielo.php?script=sci_arttext&pid=S1020-49891999000100004&lng=en&nrm=iso&tlng=enes_ES
dc.identifier.urihttps://iris.paho.org/handle/10665.2/8566
dc.format.extenttabes_ES
dc.relation.ispartofseriesRev Panam Salud Publica;5(1),ene. 1999es_ES
dc.subjectMermithoideaes_ES
dc.subjectAnopheleses_ES
dc.subjectMaláriaes_ES
dc.subjectMexicoes_ES
dc.titleThe Romanomermis iyengari parasite for Anopheles pseudopunctipennis suppression in natural habitats in Oaxaca State, Mexicoes_ES
dc.typeJournal articlesen_US
dc.rights.holderPan American Health Organizationen_US
dc.description.notesIn September and November 1996 Romanomermis yengari Welch, a parasite of larval mosquitoes, was released in 44 natural larval habitat sites of Anopheles pseudopunctipennis Theobald in an attempt to reduce the larval populations of this important malaria vector. The selected treatment sites ranged in size from 5 to 500 m2. The study was carried out in Pochutla District of Oaxaca State, on the Pacific coast of Mexico. Chemical pesticides to reduce vector populations have been the principal tool in malaria supression campaigns. However, the excessive use of these chemiclas has created pesticide resistance and other serious collateral problems. Therefore, a biological control project using agents that are pathogens of Anopheles larvae was initiated in 1996. The principal objective was to establish mass rearing capacities for R. iyengari. Detailed methodology for rearing and introducing these nematodes into mosquito larval habitats was established at the National Polytechnic Institute of Oaxaca State. Before application of the parasites to larval habitats, site characterirstics were determined, including size, depth, aquatic vegetation, salinity, ph, conductivity, temperature, and pretreatment larval density. With a compressed air sprayer, infective mermithid parasites were released at rates of either 2 000 or 3 000/m2, and the parasites produced high levels of infection. Anopheles populations were sampled 72 h posttreatment, and the larvae obtained were taken to the laboratory and examined through microscopic dissection to determine infection levels and mean parasitism. Nematode parasitism ranged from 85 to 100 per cent at all the treatment sites, even though no previous information concerning field parasitism of An. pseudopunctipennis by R. iyengari has been reported. In addition, a significant reduction of mosquito larval density at the treatment sites was found five days after the nematode application. Levels of parasitism were indicative of the number of mosquito larvae killed by the treatment since infected larvae never progressed to the pupal stage. Results from sampling nine of the sites 2 months after the initial application of nematodes indicated that a high number of mosquito larvae were infected by parasites that had emerged from eggs previously deposited in the stratum. This work suggests the potential of this mermithid to reduce An. pseudopunctipennis populations in Oaxaca Stateen_US


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