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Scott A Ritchie - One of the best experts on this subject based on the ideXlab platform.
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Efficacy of sticky and standard Ovitraps for Aedes aegypti in Trinidad, West Indies
Journal of vector ecology : journal of the Society for Vector Ecology, 2010Co-Authors: Dave D. Chadee, Scott A RitchieAbstract:The double sticky trap (DST) is described for the first time and is evaluated along with standard Ovitraps and sticky traps (STs) to determine population densities of Ae. aegypti in the urban township of St. Augustine and the rural community of Tamana, Trinidad, West Indies. Ten houses were selected at each study site. At each of the ten houses, one ovitrap, one ST, and one DST were placed using the criteria established for placement of Ovitraps. The results showed the three trapping methods successfully collected Ae. aegypti mosquitoes. All three traps collected significantly more adults or eggs in St. Augustine than in Tamana. DSTs collected 2,286 adults from St. Augustine vs 316 adults from Tamana (p
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efficacy of sticky and standard Ovitraps for aedes aegypti in trinidad west indies
Journal of Vector Ecology, 2010Co-Authors: Dave D. Chadee, Scott A RitchieAbstract:The double sticky trap (DST) is described for the first time and is evaluated along with standard Ovitraps and sticky traps (STs) to determine population densities of Ae. aegypti in the urban township of St. Augustine and the rural community of Tamana, Trinidad, West Indies. Ten houses were selected at each study site. At each of the ten houses, one ovitrap, one ST, and one DST were placed using the criteria established for placement of Ovitraps. The results showed the three trapping methods successfully collected Ae. aegypti mosquitoes. All three traps collected significantly more adults or eggs in St. Augustine than in Tamana. DSTs collected 2,286 adults from St. Augustine vs 316 adults from Tamana (p<0.002), STs collected 1,480 and 220 adults, respectively (p<0.01), and the Ovitraps collected 2,735 and 517 eggs, respectively from St. Augustine and Tamana (p<0.002). Based on these results, the DSTs collected significantly (P<0.02) more adults than the STs. The DSTs and STs collected both adult and immature stages which can be used for toxicology, virology, and PCR studies and are suitable alternative Ae. aegypti surveillance tools for the Caribbean and Latin American region.
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Oviposition behaviour and parity rates of Aedes aegypti collected in sticky traps in Trinidad, West Indies
Acta tropica, 2010Co-Authors: Dave D. Chadee, Scott A RitchieAbstract:The oviposition behaviour of Aedes aegypti was studied using sticky traps (ST), double sticky traps (DST) and standard ovitrap traps in urban St. Augustine and rural Tamana, Trinidad, West Indies. In St. Augustine three traps were deployed in 10 houses for 10 weeks while in Tamana traps were similarly deployed (10 houses for 10 weeks). At each house one ovitrap, one ST and one DST were placed using the criteria established for ovitrap placement. The results showed large numbers of adults collected, 3602 collected in DSTs and 1,670 adults collected in STs. In addition, >9000 immatures were collected in the DST vs >7000 in the STs. Over the 10 weeks 517 Ae. aegypti eggs were collected from Ovitraps from Tamana and 3252 eggs from St. Augustine. Most of the females collected were parous (99%) with many older females collected e.g. 7 pars collected in both Tamana and St. Augustine. A major finding of the study was the observation of the "death stress oviposition" behaviour displayed among Ae. aegypti females captures in the sticky traps. This is the first report of this behaviour in the field and may well explain the collection of large numbers of immatures found in the ST and DSTs. The results of this study are discussed in the context of developing surveillance and control strategies, especially for reducing man-vector contact.
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A lethal ovitrap‐based mass trapping scheme for dengue control in Australia: I. Public acceptability and performance of lethal Ovitraps
Medical and Veterinary Entomology, 2009Co-Authors: Scott A Ritchie, Luke P. Rapley, Craig R. Williams, Petrina H. Johnson, M. Larkman, R. M. Silcock, Sharron A. Long, Richard C. RussellAbstract:We report on the first field evaluation of the public acceptability and performance of two types of lethal ovitrap (LO) in three separate trials in Cairns, Australia. Health workers were able to set standard lethal Ovitraps (SLOs) in 75 and 71% of premise yards in the wet and dry season, respectively, and biodegradable lethal Ovitraps (BLOs) in 93% of yards. Public acceptance, measured as retention of traps by residents, was high for both trap types, with
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a lethal ovitrap based mass trapping scheme for dengue control in australia i public acceptability and performance of lethal Ovitraps
Medical and Veterinary Entomology, 2009Co-Authors: Luke P. Rapley, Craig R. Williams, Petrina H. Johnson, M. Larkman, R. M. Silcock, Sharron A. Long, Scott A Ritchie, Richard C. RussellAbstract:We report on the first field evaluation of the public acceptability and performance of two types of lethal ovitrap (LO) in three separate trials in Cairns, Australia. Health workers were able to set standard lethal Ovitraps (SLOs) in 75 and 71% of premise yards in the wet and dry season, respectively, and biodegradable lethal Ovitraps (BLOs) in 93% of yards. Public acceptance, measured as retention of traps by residents, was high for both trap types, with <9% of traps missing after 4 weeks. Traps retaining water after 4 weeks were 78 and 34% for the two SLO trials and 58% for the BLOs. The ‘failure rate’ in the 535 BLOs set in the field for 4 weeks was 47%, of which 19% were lost, 51% had holes from probable insect chewing, 23% were knocked over, 7% had dried by evaporation and 1% were split. There was no significant difference in the failure rate of BLOs set on porous (grass, soil and mulch) versus solid (tiles, concrete, wood and stone) substrates. The SLOs and the BLOs were readily acceptable to ovipositing Aedes aegypti L. (Diptera: Culicidae); the mean number of eggs/trap was 6 and 15, for the dry season and wet season SLO trial, respectively, and 15 for the BLO wet season trial. Indeed, 84–94% of premise yards had egg positive SLOs or BLOs. A high percentage of both wet and dry season SLOs (29 and 70%, respectively) and BLOs (62%) that were dry after 4 weeks were egg positive, indicating the traps had functioned. Lethal strips from SLOs and BLOs that had been exposed for 4 weeks killed 83 and 74%, respectively, of gravid Ae. aegypti in laboratory assays. These results indicate that mass trapping schemes using SLOs and BLOs are not rejected by the public and effectively target gravid Ae. aegypti. The impact of the interventions on mosquito populations is described in a companion paper.
Dave D. Chadee - One of the best experts on this subject based on the ideXlab platform.
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Efficacy of sticky and standard Ovitraps for Aedes aegypti in Trinidad, West Indies
Journal of vector ecology : journal of the Society for Vector Ecology, 2010Co-Authors: Dave D. Chadee, Scott A RitchieAbstract:The double sticky trap (DST) is described for the first time and is evaluated along with standard Ovitraps and sticky traps (STs) to determine population densities of Ae. aegypti in the urban township of St. Augustine and the rural community of Tamana, Trinidad, West Indies. Ten houses were selected at each study site. At each of the ten houses, one ovitrap, one ST, and one DST were placed using the criteria established for placement of Ovitraps. The results showed the three trapping methods successfully collected Ae. aegypti mosquitoes. All three traps collected significantly more adults or eggs in St. Augustine than in Tamana. DSTs collected 2,286 adults from St. Augustine vs 316 adults from Tamana (p
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efficacy of sticky and standard Ovitraps for aedes aegypti in trinidad west indies
Journal of Vector Ecology, 2010Co-Authors: Dave D. Chadee, Scott A RitchieAbstract:The double sticky trap (DST) is described for the first time and is evaluated along with standard Ovitraps and sticky traps (STs) to determine population densities of Ae. aegypti in the urban township of St. Augustine and the rural community of Tamana, Trinidad, West Indies. Ten houses were selected at each study site. At each of the ten houses, one ovitrap, one ST, and one DST were placed using the criteria established for placement of Ovitraps. The results showed the three trapping methods successfully collected Ae. aegypti mosquitoes. All three traps collected significantly more adults or eggs in St. Augustine than in Tamana. DSTs collected 2,286 adults from St. Augustine vs 316 adults from Tamana (p<0.002), STs collected 1,480 and 220 adults, respectively (p<0.01), and the Ovitraps collected 2,735 and 517 eggs, respectively from St. Augustine and Tamana (p<0.002). Based on these results, the DSTs collected significantly (P<0.02) more adults than the STs. The DSTs and STs collected both adult and immature stages which can be used for toxicology, virology, and PCR studies and are suitable alternative Ae. aegypti surveillance tools for the Caribbean and Latin American region.
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Oviposition behaviour and parity rates of Aedes aegypti collected in sticky traps in Trinidad, West Indies
Acta tropica, 2010Co-Authors: Dave D. Chadee, Scott A RitchieAbstract:The oviposition behaviour of Aedes aegypti was studied using sticky traps (ST), double sticky traps (DST) and standard ovitrap traps in urban St. Augustine and rural Tamana, Trinidad, West Indies. In St. Augustine three traps were deployed in 10 houses for 10 weeks while in Tamana traps were similarly deployed (10 houses for 10 weeks). At each house one ovitrap, one ST and one DST were placed using the criteria established for ovitrap placement. The results showed large numbers of adults collected, 3602 collected in DSTs and 1,670 adults collected in STs. In addition, >9000 immatures were collected in the DST vs >7000 in the STs. Over the 10 weeks 517 Ae. aegypti eggs were collected from Ovitraps from Tamana and 3252 eggs from St. Augustine. Most of the females collected were parous (99%) with many older females collected e.g. 7 pars collected in both Tamana and St. Augustine. A major finding of the study was the observation of the "death stress oviposition" behaviour displayed among Ae. aegypti females captures in the sticky traps. This is the first report of this behaviour in the field and may well explain the collection of large numbers of immatures found in the ST and DSTs. The results of this study are discussed in the context of developing surveillance and control strategies, especially for reducing man-vector contact.
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Proportions of eggs laid by Aedes aegypti on different substrates within an ovitrap in Trinidad, West Indies
Medical and veterinary entomology, 1995Co-Authors: Dave D. Chadee, Philip S. Corbet, Helen TalbotAbstract:. Ovitraps were exposed outdoors during wet and dry seasons in Trinidad to determine the proportions of eggs laid on three substrates: the widely-used hardboard ‘paddle’ (P), the water surface (W) and the inside surface of the ovitrap wall (S) in three types of blackened ovitrap: round, glass (RG), round, plastic (RP) and rectangular, plastic (SP). Of the 3556 eggs obtained, most (86.4%) were laid during the wet season when statistically significant differences were detected between substrates but not between ovitrap types. Most eggs (>80%) were laid on P, significantly fewer (P < 0.005) on W, on S and on W + S, thus confirming the superiority of the paddle as a device for monitoring oviposition activity. Implications of these findings for the interpretation of Aedes studies using Ovitraps are discussed.
Virgília Luna Castor De Lima - One of the best experts on this subject based on the ideXlab platform.
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Study of the distribution and abundance of the eggs of Aedes aegypti and Aedes albopictus according to the habitat and meteorological variables, municipality of São Sebastião, São Paulo State, Brazil
Parasites & Vectors, 2013Co-Authors: Lígia Leandro Nunes Serpa, Gisela Rita Alvarenga Monteiro Marques, Ana Paula De Lima, Júlio Cesar Voltolini, Marylene De Brito Arduino, Gerson Laurindo Barbosa, Valmir Roberto Andrade, Virgília Luna Castor De LimaAbstract:Background This study focused on the distribution and abundance of the eggs of Aedes aegypti and Aedes albopictus . Methods Eighty Ovitraps were exposed for four days of each month in peri- and intradomiciliary environments of 40 urban residences on 20 street blocks that were drawn monthly in Sebastião, SP, between February 2011 and February 2012. The monthly distribution of positive ovitrap indices (POI) and mean egg counts per trap (MET) of Ae. aegypti and Ae. albopictus were analyzed using the Kruskal-Wallis test, followed by the Dwass-Steel-Critchlow-Fligner (DSCF) test. Spearman's rank correlation coefficient and simple linear regression were used to determine the association between the meteorological variables of temperature and rainfall and the number of Ovitraps with eggs and the egg count. Results The POI and MET of Ae. aegypti were higher in peridomiciliary premises. A positive correlation was found between the temperature and the number of Ovitraps with eggs and the egg count of this species in domestic environments. There was no difference in the POI and MET of Ae. albopictus between the environments. A positive correlation was found between temperature and positive Ovitraps of Ae. albopictus in peridomiciliary premises. The POI and MET of Ae. aegypti were higher than those of Ae. albopictus . Conclusions Peridomiciliary premises were the preferred environments for oviposition of Ae. aegypti . The use of Ovitraps for surveillance and vector control is reiterated.
Helen Talbot - One of the best experts on this subject based on the ideXlab platform.
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Proportions of eggs laid by Aedes aegypti on different substrates within an ovitrap in Trinidad, West Indies
Medical and veterinary entomology, 1995Co-Authors: Dave D. Chadee, Philip S. Corbet, Helen TalbotAbstract:. Ovitraps were exposed outdoors during wet and dry seasons in Trinidad to determine the proportions of eggs laid on three substrates: the widely-used hardboard ‘paddle’ (P), the water surface (W) and the inside surface of the ovitrap wall (S) in three types of blackened ovitrap: round, glass (RG), round, plastic (RP) and rectangular, plastic (SP). Of the 3556 eggs obtained, most (86.4%) were laid during the wet season when statistically significant differences were detected between substrates but not between ovitrap types. Most eggs (>80%) were laid on P, significantly fewer (P < 0.005) on W, on S and on W + S, thus confirming the superiority of the paddle as a device for monitoring oviposition activity. Implications of these findings for the interpretation of Aedes studies using Ovitraps are discussed.
Richard C. Russell - One of the best experts on this subject based on the ideXlab platform.
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a lethal ovitrap based mass trapping scheme for dengue control in australia i public acceptability and performance of lethal Ovitraps
Medical and Veterinary Entomology, 2009Co-Authors: Luke P. Rapley, Craig R. Williams, Petrina H. Johnson, M. Larkman, R. M. Silcock, Sharron A. Long, Scott A Ritchie, Richard C. RussellAbstract:We report on the first field evaluation of the public acceptability and performance of two types of lethal ovitrap (LO) in three separate trials in Cairns, Australia. Health workers were able to set standard lethal Ovitraps (SLOs) in 75 and 71% of premise yards in the wet and dry season, respectively, and biodegradable lethal Ovitraps (BLOs) in 93% of yards. Public acceptance, measured as retention of traps by residents, was high for both trap types, with <9% of traps missing after 4 weeks. Traps retaining water after 4 weeks were 78 and 34% for the two SLO trials and 58% for the BLOs. The ‘failure rate’ in the 535 BLOs set in the field for 4 weeks was 47%, of which 19% were lost, 51% had holes from probable insect chewing, 23% were knocked over, 7% had dried by evaporation and 1% were split. There was no significant difference in the failure rate of BLOs set on porous (grass, soil and mulch) versus solid (tiles, concrete, wood and stone) substrates. The SLOs and the BLOs were readily acceptable to ovipositing Aedes aegypti L. (Diptera: Culicidae); the mean number of eggs/trap was 6 and 15, for the dry season and wet season SLO trial, respectively, and 15 for the BLO wet season trial. Indeed, 84–94% of premise yards had egg positive SLOs or BLOs. A high percentage of both wet and dry season SLOs (29 and 70%, respectively) and BLOs (62%) that were dry after 4 weeks were egg positive, indicating the traps had functioned. Lethal strips from SLOs and BLOs that had been exposed for 4 weeks killed 83 and 74%, respectively, of gravid Ae. aegypti in laboratory assays. These results indicate that mass trapping schemes using SLOs and BLOs are not rejected by the public and effectively target gravid Ae. aegypti. The impact of the interventions on mosquito populations is described in a companion paper.
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A lethal ovitrap‐based mass trapping scheme for dengue control in Australia: I. Public acceptability and performance of lethal Ovitraps
Medical and Veterinary Entomology, 2009Co-Authors: Scott A Ritchie, Luke P. Rapley, Craig R. Williams, Petrina H. Johnson, M. Larkman, R. M. Silcock, Sharron A. Long, Richard C. RussellAbstract:We report on the first field evaluation of the public acceptability and performance of two types of lethal ovitrap (LO) in three separate trials in Cairns, Australia. Health workers were able to set standard lethal Ovitraps (SLOs) in 75 and 71% of premise yards in the wet and dry season, respectively, and biodegradable lethal Ovitraps (BLOs) in 93% of yards. Public acceptance, measured as retention of traps by residents, was high for both trap types, with
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OPTIMIZING OVITRAP USE FOR AEDES AEGYPTI IN CAIRNS, QUEENSLAND, AUSTRALIA: EFFECTS OF SOME ABIOTIC FACTORS ON FIELD EFFICACY
Journal of the American Mosquito Control Association, 2006Co-Authors: Craig R. Williams, Sharron A. Long, Richard C. Russell, Scott A RitchieAbstract:Insecticide-treated lethal Ovitraps are used for control of the dengue vector Aedes aegypti in north Queensland, Australia. In an effort to optimize their use, the influence of deployment height, premise shading, and protection from wind on trap efficacy was assessed in field experiments. Sticky Ovitraps were used as a proxy for lethal Ovitraps because they provide a direct measure of adult visitation rates. Sticky Ovitraps deployed at ground level for 1 wk captured significantly more female Ae. aegypti (mean ± SE, 1.7 ± 0.4) than those set at 1.75-m elevation (1.0 ± 0.3). Setting traps on the leeward side of houses significantly improved collections during a dry season experiment but not in the wet season. Traps set at lightly or heavily shaded premises performed equally well. To determine the optimum number of Ovitraps to set per premise, five treatments making up different numbers of traps (1, 2, 4, 6, or 8) were trialled in a Latin square experimental design. Female Ae. aegypti collections increased as more traps were deployed, although mean collections by using 4 (2.6 ± 0.6), 6 (2.4 ± 0.5), or 8 traps (4.8 ± 1.3) could not be separated statistically, suggesting that 4 traps was the optimum number for routine deployment.
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surveillance and behavioral investigations of aedes aegypti and aedes polynesiensis in moorea french polynesia using a sticky ovitrap
Journal of The American Mosquito Control Association, 2004Co-Authors: Richard C. Russell, Scott A RitchieAbstract:The effectiveness of the sticky ovitrap was assessed for the container-breeding Aedes aegypti and Aedes polynesiensis in Moorea, French Polynesia. These mosquitoes are the primary vectors of dengue viruses and Bancroftian filariasis, respectively, in the area. Both Ae. aegypti and Ae. polynesiensis were collected in greatest numbers in sticky Ovitraps baited with water or grass infusions rather than leaf infusions. Sticky ovitrap collections were significantly higher for both species in the 12 h post-midday than pre-midday and in traps set in shaded compared with open locations. More females of Ae. aegypti were collected in Ovitraps at west-facing walls, although Ae. polynesiensis collected at east- or west-facing traps did not differ in number. Female Ae. aegypti (bloodfed, marked, and released for oviposition) were readily recaptured (19-26%) by sticky Ovitraps, exhibiting movement of up to 30 m, and between outdoor and indoor situations. Overall, the sticky ovitrap proved an effective tool for investigating the oviposition behavior and dispersal of these container-breeding species.
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An adulticidal sticky ovitrap for sampling container-breeding mosquitoes.
Journal of the American Mosquito Control Association, 2003Co-Authors: Scott A Ritchie, Sharron Long, Alistair Hart, Cameron E. Webb, Richard C. RussellAbstract:The efficacy of a standard ovitrap and an ovitrap featuring an internal wall covered by a polybutylene adhesive was compared in field studies in Cairns, Australia. The sticky ovitrap was as effective as the standard ovitrap in detecting Aedes aegypti, with 67.5% and 64% of traps positive for Ae. aegypti, respectively. Significantly higher numbers of Ae. aegypti were collected by traps set outside rather than inside premises. Sticky Ovitraps also readily collected Ochlerotatus notoscriptus and, especially, Culex quinquefasciatus. With a 10X hand lens, mosquitoes of these species could readily be identified in traps set for 3 and 7 days. The sticky Ovitraps were comparable in cost and as time efficient as standard Ovitraps. The greatest advantage of the sticky ovitrap is the collection of adult female mosquitoes, negating the need to rear larvae for identification and providing a faster, more direct measure of the effectiveness of ovipositional attractants than egg counts. Finally, we demonstrated that sticky Ovitraps, being adulticidal, have potential as a supplementary control measure, especially for quarantine programs designed to prevent the import and export of container-breeding vector mosquitoes at sea- and airports.
