The Experts below are selected from a list of 1605 Experts worldwide ranked by ideXlab platform
Lane D Foil - One of the best experts on this subject based on the ideXlab platform.
-
use of the polymerase chain reaction to investigate the dynamics of pyrethroid resistance in haematobia irritans irritans diptera muscidae
Journal of Medical Entomology, 2002Co-Authors: Felix D Guerrero, Montgomery W Alison, Diane M Kammlah, Lane D FoilAbstract:A field study was conducted from 1991 through 1997 to evaluate the use of pyrethroid and organophosphate (OP) Ear Tags, alternated yEarly, for the control of a pyrethroid resistant horn fly, Haematobia irritans (L.), population in Louisiana. Fly resistance was monitored by weekly fly counts, filter paper bioassays and diagnostic polymerase chain reaction (PCR) assays for the presence of pyrethroid resistance-associated mutations in the sodium channel gene coding region. Fly control in the first study yEar was poor, as pyrethroid Ear Tags were effective for only 7 wk. The following yEar, OP Ear Tags provided 15 wk of fly control. However, in all subsequent yEars, fly control was poor with both types of Ear Tags. The PCR assays showed that there were very few female flies homozygous for the pyrethroid susceptible sodium channel allele, never rising above 10% of the total females in the population. A fitness cost appEared to be associated with the pyrethroid resistant allele, as the resistant form was selected against in the absence of the pyrethroid Ear Tags. Despite this selection in favor of the susceptible allele and the annual alternation of pyrethroid and OP Ear Tags, the percentage of homozygous susceptible flies never reached over 19% of the population, resistant alleles of the sodium channel remained at high levels in the population, and horn fly control on cattle with either type of tag quickly became minimal.
-
horn fly diptera muscidae resistance to organophosphate insecticides
Veterinary Parasitology, 2001Co-Authors: Antonio Thadeu Medeiros De Barros, J Ottea, D W Sanson, Lane D FoilAbstract:Abstract Insecticidal Ear Tags impregnated with organophosphate (OP) insecticides were used each yEar from 1989 to 1998 at Rosepine, LA. Weekly fly counts were conducted to evaluate control efficacy of the treatments, and bioassays were conducted at least twice per yEar to measure fly susceptibility to OP and pyrethroid insecticides. Between 1989 and 1992, the efficacy of 20% diazinon-impregnated Ear Tags was reduced from >20 to just 1 week of control. A high risk of control failure was observed when a resistance frequency of approximately 5% was measured in pre-season bioassays. Resistance to diazinon, fenthion, ethion, pirimiphos-methyl, and tetrachlorvinphos was observed. Esterase activity toward α-naphthyl acetate was significantly higher in flies collected at Rosepine in 1997 than in flies from a laboratory colony and from a susceptible field population.
Alberto A. Guglielmone - One of the best experts on this subject based on the ideXlab platform.
-
abundance of stable flies on heifers treated for control of horn flies with organophosphate impregnated Ear Tags
Medical and Veterinary Entomology, 2004Co-Authors: Alberto A. Guglielmone, M. M. Volpogni, O. S. Anziani, O R Quaino, A J MangoldAbstract:Ear Tags containing 40% organophosphate insecticides (diazinon or diazinon plus chlorpyrifos-ethyl) were applied to control Haematobia irritans (L.) (Diptera: Muscidae) in treated (TG01 and TG02) and untreated (UG01 and UG02) groups of Holstein heifers born in 2001 and 2002, respectively. Control and treated groups were assessed for the abundance of Stomoxys calcitrans (L.) (Diptera: Muscidae) from August 2001 to April 2002 and again from August 2002 to April 2003. The treatment had a high efficacy for control of horn flies (maximum median number per heifer of TG01 and TG02 = 5) but a low effect on the abundance of stable flies. The total numbers of S. calcitrans were 1251 (42.9% of the total) and 1668 (57.1%) for TG01 and UG01, and 1423 (48.8%) and 1494 (51.2%) in TG02 and UG02, respectively. No significant difference in stable fly burden was found in 55 of the 76 weeks evaluated. A unimodal peak of abundance in the spring was found during the first fly season, and a bimodal abundance, with peaks in the spring and autumn, during the second season. No strong associations between horn fly and stable fly burdens was found in individuals of the CG01 (correlation coefficient = 0.13, P > 0.05) or CG02 (correlation coefficient = 0.538, P < 0.05, determination coefficient = 0.289).
-
Evaluation of insecticide Ear Tags containing ethion for control of pyrethroid resistant Haematobia irritans (L.) on dairy cattle.
Veterinary parasitology, 2000Co-Authors: O. S. Anziani, Alberto A. Guglielmone, G Zimmermann, M Forchieri, M. M. VolpogniAbstract:A field study was conducted in central Argentina to evaluate the efficacy of Ear Tags containing 36% ethion against pyrethroid resistant populations of Haematobia irritans on grazing dairy cattle. The treated group consisted of 45 milking Holstein cows which received two Tags per head and the control consisted of 22 dry cows from the same cohort. Treated and control groups were grazed on similar lucerne pastures separated for a minimum distance of 800 m but they were not isolated from other cattle herds on the same or contiguous properties. In both groups, horn fly estimation were made weekly by examining cattle in the pastures with the aid of binoculars. The percentage reduction of fly numbers on treated cows was considered as efficacy of control provided by the Tags. The ethion Ear Tags provided a range of 85-99% reduction in horn fly numbers for 16 weeks. During this period, the weekly mean number of H. irritans on the tagged cows ranged between 0.44 and 28.26 compared with 143.5 and 239.1 in control animals. The ethion Ear Tags could be a useful tool for the control of H. irritans mainly in areas where populations of this insect have developed resistance to pyrethroid insecticides.
-
Chlorfenapyr Ear Tags to control Haematobia irritans (L.) (Diptera: Muscidae) on cattle.
Veterinary Parasitology, 2000Co-Authors: Alberto A. Guglielmone, A J Mangold, M. M. Volpogni, N Scherling, M. E. Muñoz Cobeñas, O. S. Anziani, M Ioppolo, M. E. DoscherAbstract:Abstract The efficacy of Ear Tags containing 30% chlorfenapyr (total tag weight=13 g) to control natural Haematobia irritans (L.) infestations was evaluated for Holstein heifers in Rafaela, province of Santa Fe, Argentina. A group of heifers (TG) was treated with two Ear Tags (one tag per Ear). A control group (ACG) was maintained in a paddock adjacent to the TG paddock and, a distant control group (DCG) was maintained 700 m apart from the other groups. From day 4 to day 98 after treatment, H. irritans infestations of ACG were significantly higher (P
M. M. Volpogni - One of the best experts on this subject based on the ideXlab platform.
-
abundance of stable flies on heifers treated for control of horn flies with organophosphate impregnated Ear Tags
Medical and Veterinary Entomology, 2004Co-Authors: Alberto A. Guglielmone, M. M. Volpogni, O. S. Anziani, O R Quaino, A J MangoldAbstract:Ear Tags containing 40% organophosphate insecticides (diazinon or diazinon plus chlorpyrifos-ethyl) were applied to control Haematobia irritans (L.) (Diptera: Muscidae) in treated (TG01 and TG02) and untreated (UG01 and UG02) groups of Holstein heifers born in 2001 and 2002, respectively. Control and treated groups were assessed for the abundance of Stomoxys calcitrans (L.) (Diptera: Muscidae) from August 2001 to April 2002 and again from August 2002 to April 2003. The treatment had a high efficacy for control of horn flies (maximum median number per heifer of TG01 and TG02 = 5) but a low effect on the abundance of stable flies. The total numbers of S. calcitrans were 1251 (42.9% of the total) and 1668 (57.1%) for TG01 and UG01, and 1423 (48.8%) and 1494 (51.2%) in TG02 and UG02, respectively. No significant difference in stable fly burden was found in 55 of the 76 weeks evaluated. A unimodal peak of abundance in the spring was found during the first fly season, and a bimodal abundance, with peaks in the spring and autumn, during the second season. No strong associations between horn fly and stable fly burdens was found in individuals of the CG01 (correlation coefficient = 0.13, P > 0.05) or CG02 (correlation coefficient = 0.538, P < 0.05, determination coefficient = 0.289).
-
Evaluation of insecticide Ear Tags containing ethion for control of pyrethroid resistant Haematobia irritans (L.) on dairy cattle.
Veterinary parasitology, 2000Co-Authors: O. S. Anziani, Alberto A. Guglielmone, G Zimmermann, M Forchieri, M. M. VolpogniAbstract:A field study was conducted in central Argentina to evaluate the efficacy of Ear Tags containing 36% ethion against pyrethroid resistant populations of Haematobia irritans on grazing dairy cattle. The treated group consisted of 45 milking Holstein cows which received two Tags per head and the control consisted of 22 dry cows from the same cohort. Treated and control groups were grazed on similar lucerne pastures separated for a minimum distance of 800 m but they were not isolated from other cattle herds on the same or contiguous properties. In both groups, horn fly estimation were made weekly by examining cattle in the pastures with the aid of binoculars. The percentage reduction of fly numbers on treated cows was considered as efficacy of control provided by the Tags. The ethion Ear Tags provided a range of 85-99% reduction in horn fly numbers for 16 weeks. During this period, the weekly mean number of H. irritans on the tagged cows ranged between 0.44 and 28.26 compared with 143.5 and 239.1 in control animals. The ethion Ear Tags could be a useful tool for the control of H. irritans mainly in areas where populations of this insect have developed resistance to pyrethroid insecticides.
-
Chlorfenapyr Ear Tags to control Haematobia irritans (L.) (Diptera: Muscidae) on cattle.
Veterinary Parasitology, 2000Co-Authors: Alberto A. Guglielmone, A J Mangold, M. M. Volpogni, N Scherling, M. E. Muñoz Cobeñas, O. S. Anziani, M Ioppolo, M. E. DoscherAbstract:Abstract The efficacy of Ear Tags containing 30% chlorfenapyr (total tag weight=13 g) to control natural Haematobia irritans (L.) infestations was evaluated for Holstein heifers in Rafaela, province of Santa Fe, Argentina. A group of heifers (TG) was treated with two Ear Tags (one tag per Ear). A control group (ACG) was maintained in a paddock adjacent to the TG paddock and, a distant control group (DCG) was maintained 700 m apart from the other groups. From day 4 to day 98 after treatment, H. irritans infestations of ACG were significantly higher (P
A J Mangold - One of the best experts on this subject based on the ideXlab platform.
-
abundance of stable flies on heifers treated for control of horn flies with organophosphate impregnated Ear Tags
Medical and Veterinary Entomology, 2004Co-Authors: Alberto A. Guglielmone, M. M. Volpogni, O. S. Anziani, O R Quaino, A J MangoldAbstract:Ear Tags containing 40% organophosphate insecticides (diazinon or diazinon plus chlorpyrifos-ethyl) were applied to control Haematobia irritans (L.) (Diptera: Muscidae) in treated (TG01 and TG02) and untreated (UG01 and UG02) groups of Holstein heifers born in 2001 and 2002, respectively. Control and treated groups were assessed for the abundance of Stomoxys calcitrans (L.) (Diptera: Muscidae) from August 2001 to April 2002 and again from August 2002 to April 2003. The treatment had a high efficacy for control of horn flies (maximum median number per heifer of TG01 and TG02 = 5) but a low effect on the abundance of stable flies. The total numbers of S. calcitrans were 1251 (42.9% of the total) and 1668 (57.1%) for TG01 and UG01, and 1423 (48.8%) and 1494 (51.2%) in TG02 and UG02, respectively. No significant difference in stable fly burden was found in 55 of the 76 weeks evaluated. A unimodal peak of abundance in the spring was found during the first fly season, and a bimodal abundance, with peaks in the spring and autumn, during the second season. No strong associations between horn fly and stable fly burdens was found in individuals of the CG01 (correlation coefficient = 0.13, P > 0.05) or CG02 (correlation coefficient = 0.538, P < 0.05, determination coefficient = 0.289).
-
Chlorfenapyr Ear Tags to control Haematobia irritans (L.) (Diptera: Muscidae) on cattle.
Veterinary Parasitology, 2000Co-Authors: Alberto A. Guglielmone, A J Mangold, M. M. Volpogni, N Scherling, M. E. Muñoz Cobeñas, O. S. Anziani, M Ioppolo, M. E. DoscherAbstract:Abstract The efficacy of Ear Tags containing 30% chlorfenapyr (total tag weight=13 g) to control natural Haematobia irritans (L.) infestations was evaluated for Holstein heifers in Rafaela, province of Santa Fe, Argentina. A group of heifers (TG) was treated with two Ear Tags (one tag per Ear). A control group (ACG) was maintained in a paddock adjacent to the TG paddock and, a distant control group (DCG) was maintained 700 m apart from the other groups. From day 4 to day 98 after treatment, H. irritans infestations of ACG were significantly higher (P
O. S. Anziani - One of the best experts on this subject based on the ideXlab platform.
-
abundance of stable flies on heifers treated for control of horn flies with organophosphate impregnated Ear Tags
Medical and Veterinary Entomology, 2004Co-Authors: Alberto A. Guglielmone, M. M. Volpogni, O. S. Anziani, O R Quaino, A J MangoldAbstract:Ear Tags containing 40% organophosphate insecticides (diazinon or diazinon plus chlorpyrifos-ethyl) were applied to control Haematobia irritans (L.) (Diptera: Muscidae) in treated (TG01 and TG02) and untreated (UG01 and UG02) groups of Holstein heifers born in 2001 and 2002, respectively. Control and treated groups were assessed for the abundance of Stomoxys calcitrans (L.) (Diptera: Muscidae) from August 2001 to April 2002 and again from August 2002 to April 2003. The treatment had a high efficacy for control of horn flies (maximum median number per heifer of TG01 and TG02 = 5) but a low effect on the abundance of stable flies. The total numbers of S. calcitrans were 1251 (42.9% of the total) and 1668 (57.1%) for TG01 and UG01, and 1423 (48.8%) and 1494 (51.2%) in TG02 and UG02, respectively. No significant difference in stable fly burden was found in 55 of the 76 weeks evaluated. A unimodal peak of abundance in the spring was found during the first fly season, and a bimodal abundance, with peaks in the spring and autumn, during the second season. No strong associations between horn fly and stable fly burdens was found in individuals of the CG01 (correlation coefficient = 0.13, P > 0.05) or CG02 (correlation coefficient = 0.538, P < 0.05, determination coefficient = 0.289).
-
Evaluation of insecticide Ear Tags containing ethion for control of pyrethroid resistant Haematobia irritans (L.) on dairy cattle.
Veterinary parasitology, 2000Co-Authors: O. S. Anziani, Alberto A. Guglielmone, G Zimmermann, M Forchieri, M. M. VolpogniAbstract:A field study was conducted in central Argentina to evaluate the efficacy of Ear Tags containing 36% ethion against pyrethroid resistant populations of Haematobia irritans on grazing dairy cattle. The treated group consisted of 45 milking Holstein cows which received two Tags per head and the control consisted of 22 dry cows from the same cohort. Treated and control groups were grazed on similar lucerne pastures separated for a minimum distance of 800 m but they were not isolated from other cattle herds on the same or contiguous properties. In both groups, horn fly estimation were made weekly by examining cattle in the pastures with the aid of binoculars. The percentage reduction of fly numbers on treated cows was considered as efficacy of control provided by the Tags. The ethion Ear Tags provided a range of 85-99% reduction in horn fly numbers for 16 weeks. During this period, the weekly mean number of H. irritans on the tagged cows ranged between 0.44 and 28.26 compared with 143.5 and 239.1 in control animals. The ethion Ear Tags could be a useful tool for the control of H. irritans mainly in areas where populations of this insect have developed resistance to pyrethroid insecticides.
-
Chlorfenapyr Ear Tags to control Haematobia irritans (L.) (Diptera: Muscidae) on cattle.
Veterinary Parasitology, 2000Co-Authors: Alberto A. Guglielmone, A J Mangold, M. M. Volpogni, N Scherling, M. E. Muñoz Cobeñas, O. S. Anziani, M Ioppolo, M. E. DoscherAbstract:Abstract The efficacy of Ear Tags containing 30% chlorfenapyr (total tag weight=13 g) to control natural Haematobia irritans (L.) infestations was evaluated for Holstein heifers in Rafaela, province of Santa Fe, Argentina. A group of heifers (TG) was treated with two Ear Tags (one tag per Ear). A control group (ACG) was maintained in a paddock adjacent to the TG paddock and, a distant control group (DCG) was maintained 700 m apart from the other groups. From day 4 to day 98 after treatment, H. irritans infestations of ACG were significantly higher (P
