The results of this study showed a correlation between certain environmental parameters and mosquito larvae abundance, and these parameters should be considered in planning and implementing larval control programs.
Concerns about traditional chemical pesticides has led to increasing research into novel mosquito control methods. This study compared the effectiveness of 2 different types of polystyrene beads for control of mosquito larvae in south-east Islamic Republic of Iran. Simulated field trials were done in artificial pools and field trials were carried out in 2 villages in an indigenous malaria area using WHO-recommended methods. Application of expanded polystyrene beads or shredded, waste polystyrene chips to pool surfaces produced a significant difference between pre-treatment and post-treatment density of mosquitoes (86% and 78% reduction respectively 2 weeks after treatment). There was no significant difference between the efficacy of the 2 types of material. The use of polystyrene beads as a component of integrated vector management with other supportive measures could assist in the control of mosquito-borne diseases in the Islamic Republic of Iran and neighbouring countries. RÉSUMÉ Les préoccupations concernant les pesticides chimiques traditionnels ont conduit à intensifier la recherche sur de nouvelles méthodes de lutte contre les moustiques. La présente étude a comparé l'efficacité de deux types de billes de polystyrène dans la lutte antilarvaire dans le sud-est de la République islamique d'Iran. Les simulations d'essais sur le terrain ont été réalisées dans des bassins artificiels alors que les essais sur le terrain ont été menés dans deux villages d'une zone où le paludisme est autochtone, avec des méthodes recommandées par l'Organisation mondiale de la Santé. L'application de billes de polystyrène expansé ou de copeaux de polystyrène recyclé sur la surface des bassins a entraîné une différence significative entre la densité des moustiques avant et après le traitement (86% et 78% de réduction respectivement après deux semaines de traitement). Il n'y avait pas de différence significative entre l'efficacité des deux types de matériaux. L'utilisation de billes de polystyrène en tant que composante de la gestion intégrée des vecteurs avec d'autres mesures d'appui pourrait contribuer à la lutte contre les maladies transmises par des moustiques en République islamique d'Iran et dans les pays voisins.املتوسط لرشق الصحية املجلة عرش الثامن املجلد العارش العدد 1043
Due to low efficacy in the field of a local commercial product of Bacillus thuringiensis M-H-14 (Bioflash®), a study was designed to assess its efficacy in laboratory, glass standard aquarium, semi-field and field conditions at both target and higher dosages against immature stages of Anopheles spp. and Culex spp. In laboratory conditions, the LC 50 values of wettable powder and granule formulations were 227 and 1031 ppm respectively against a susceptible strain of An. stephensi. Following application of wettable powder and granules at 56.1 mg/aquarium, the survival rates of the exposed larvae to the granule formulation were 65.6% and 54.2% on days 6 and 8 respectively. In the artificial ponds, the larval density was reduced to 38.9%, 39.3% and 65.1% at dosages of 2, 4 and 8 g/m 2 respectively. In rice fields, at a dosage of 2 kg/ha, the density of immature larvae were reduced to 33.1% and 28.6% 7-days post-treatment. Further investigations are needed for the reasons for the low efficacy of this larvicide. , 4 g/m 2 et 8 g/m 2 respectivement. Dans les rizières, à une dose de 2 kg/ha, la densité des larves immatures a été réduite, passant à 33,1 % et 28,6 %, sept jours après le traitement. Des recherches supplémentaires sont nécessaires pour expliquer la faible efficacité de ce larvicide.
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