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Desenvolvimento de Haematobia irritans em massas fecais de bovinos mantidas em laboratório
Barros Antonio Thadeu Medeiros de
Pesquisa Agropecuária Brasileira , 2002,
Abstract: Este estudo objetivou conhecer o período de desenvolvimento da mosca-dos-chifres (Haematobia irritans L., Diptera: Muscidae) em massas fecais (MF) de bovinos. Mensalmente, de maio/92 a abril/93, foram coletadas duas MF, 48 horas após deposi o, e levadas ao Laboratório de Entomologia, em Corumbá, MS, para coletas diárias de insetos durante 30 dias. A emergência de H. irritans (n=171) ocorreu em 79,2% das MF, variando de 0 a 29 moscas/MF (média de 7,1). O período mínimo até a emergência (ovo-adulto) variou de 9 a 17 dias (temperaturas médias mensais de 23,2 a 30,2oC), respectivamente, durante o ver o/início do outono, e no inverno, sugerindo que a H. irritans apresente cerca de 22 gera es anuais.
Pupas de mosca-dos-chifres, Haematobia irritans, em massas fecais de bovinos Nelore no Pantanal  [cached]
SERENO FABIANA TAVARES PIRES DE SOUZA
Pesquisa Agropecuária Brasileira , 2000,
Abstract: Este estudo foi realizado na Embrapa-Centro de Pesquisa Agropecuária do Pantanal, Corumbá, MS, durante o período de junho/92 a maio/94. Foram realizadas coletas mensais de massas fecais de bovinos da ra a Nelore com o objetivo de quantificar popula es de Haematobia irritans (L.) (Diptera, Muscidae) e parasitóides que se desenvolvem nessas pupas. Durante dois anos foram coletadas 588 pupas da mosca-dos-chifres e observados 10% de parasitismo. As espécies de parasitóides (Hymenoptera) estudadas foram: Spalangia nigroaenea (Pteromalidae), S. endius (Pteromalidae), Rhoptromeris sp. (Eucoilidae) e Trichopria haematobiae (Diapriidae). A espécie S. nigroaenea, responsável por 91,5% do parasitismo em H. irritans, tem pequena seletividade quanto ao hospedeiro, assim como as demais espécies observadas.
Desenvolvimento de Haematobia irritans em massas fecais de bovinos mantidas em laboratório
Barros, Antonio Thadeu Medeiros de;
Pesquisa Agropecuária Brasileira , 2002, DOI: 10.1590/S0100-204X2002000200014
Abstract: this study investigated the developmental time of the horn fly (haematobia irritans l., diptera: muscidae) in bovine manure. monthly, from may 1992 to april 1993, two dung pats were collected 48 hours after dropping in the field, and brought to the laboratory of entomology, in corumbá, ms, brazil, for insect daily collections during 30 days. emergency of h. irritans (n=171) was observed in 79.2% of the pats, ranging from 0 to 29 flies/pat (7.1 average). the period until fly emergency (egg to adult) ranged from 9 to 17 days (monthly mean temperatures ranged 23.2 to 30.2oc), during summer/autumn and winter, respectively, suggesting that h. irritans may have about 22 generations per year.
Pupas de mosca-dos-chifres, Haematobia irritans, em massas fecais de bovinos Nelore no Pantanal
SERENO, FABIANA TAVARES PIRES DE SOUZA;
Pesquisa Agropecuária Brasileira , 2000, DOI: 10.1590/S0100-204X2000000800023
Abstract: this study was carried out in embrapa-centro de pesquisa agropecuária do pantanal, corumbá, ms, brazil, from june/92 to may/94. manure samples of nelore breed were collected monthly to quantify if haematobia irritans (l.) populations and parasitoids were present. during two years, 588 h. irritans pupae were collected and 10% of parasitism were observed. the parasitoids species (hymenoptera) found were: spalangia nigroaenea (pteromalidae), s. endius (pteromalidae), rhoptromeris sp. (eucoilidae) and trichopria haematobiae (diapriidae). s. nigroaenea was responsible for 91.5% parasitism in pupae of h. irritans, this species and the other parasitoids species have low selectivity regarding host choice.
Emergência de Haematobia irritans em fezes bovinas no município de Seropédica, Rio de Janeiro  [cached]
Macedo Douglas Marques de,Brito Luciana Gatto,Borja Gonzalo Efrain Moya
Pesquisa Veterinária Brasileira , 2001,
Abstract: O presente trabalho teve como objetivo estudar a emergência de Haematobia irritans em fezes de bovinos mantidas a campo e em laboratório, além de observar a presen a de outros dípteros associados às massas fecais. Foram utilizados dois grupos de fezes bovinas, um à campo e outro em laboratório, sendo cada grupo formado por cinco bolos fecais frescos de tamanho mediano (cerca de 30 cm de diametro), aparência opaca, cor esverdeada, presen a de fina crosta externa e consistência firme. As fezes foram cobertas com gaiolas de emergência de formato piramidal, apresentando na parte superior um orifício onde foi acoplado um frasco removível; a substitui o das fezes foi realizada quinzenalmente. Foram coletados um total de 355 espécimens de H. irritans, sendo 151 provenientes das gaiolas mantidas no campo e 204 em laboratório. Estas diferen as deveram-se provavelmente à menores oscila es de temperatura verificadas no laboratório do que àquelas ocorridas no campo, além da a o de artrópodes predadores, competidores e parasitóides que, provavelmente, interferiram na emergência de H. irritans nas fezes bovinas mantidas no campo. Foi observado maior número de fêmeas em compara o com machos em ambas as condi es investigadas. Além de H. irritans, obteve-se outros dípteros associados às fezes bovinas, pertencentes as seguintes famílias: Aulacigastridae, Muscidae, Psychodidae, Sarcophagidae, Sepsidae, Tachinidae e Ulidiidae. Sepsidae foi a mais abundante, com 5.224 exemplares do total de 8.928 dípteros obtidos, seguida por Sarcophagidae com 2.235 espécimens coletados, Muscidae com 1.357, Aulacigastridae com 54, Psychodidae com 46, Ulidiidae com 6 e Tachinidae com 5 exemplares.
Sobre a ocorrência de uma nova praga, Haematobia irritans (L.) (Diptera, Muscidae), no Brasil
Valério, José Raul;Guimar?es, José Henrique;
Revista Brasileira de Zoologia , 1982, DOI: 10.1590/S0101-81751982000400002
Abstract: the horn fly, haematobia irritans (l.) (diptera, muscidae), is reported as introduced into boa vista, roraima, brasil, possibly from northern south america (venezuela).
Sazonalidade de Haematobia irritans no Brasil Central
Bianchin, Ivo;Koller, Wilson W.;Detmann, Edenio;
Pesquisa Veterinária Brasileira , 2006, DOI: 10.1590/S0100-736X2006000200004
Abstract: horn fly (haematobia irritans) is one of the most important brazilian cattle ectoparasites. epidemiological studies are needed due the increasing difficulty of their chemical control. in order to obtain a better knowledge of their seasonal population dynamics, 14 days interval fly counts were made on 7-30 month old beef cattle, from winter 1996 to summer 2002. horn fly population levels increase (p<0.05) was observed during the seasons of each infestation period (spring until autumn), mainly in spring and summer, and sometimes in autumn, followed by a significant reduction (p<0.05) in winter, when the relative humidity decreases to less than 60%. a straight (p<0.05) and immediate correlation between the relative humidity and the fly count was found, whilst the most evident effects of temperature and rain fall (p<0.05) were associated with counts done 42-56 days after attainment of the climatic data. the highest parasitism load (average number of flies per animal) observed for the genetic groups used were: aberdeen angus x nellore = 173.5 (134-254); ? brown swiss x nellore = 183.5 (32-540); ? aberdeen angus x nellore = 133.0 (18-374), and valdostana x nellore = 219.0 (58-620). torrential rain falls during the initial half of the infestation period (spring until midsummer) are common in this region and were considered the main reason for the low to moderate population levels verified at that time, in comparison with those which occurred during the last half of the infestation period.
Developmental stress by diflubenzuron in Haematobia irritans (L.) (Diptera: Muscidae)
Silva, Juliana J. da;Mendes, Júlio;Lom?naco, Cecília;
Neotropical Entomology , 2004, DOI: 10.1590/S1519-566X2004000200017
Abstract: this study aimed to assess the effect of sub-lethal concentrations of the insect growth regulator (igr), diflubenzuron, on the body size of the horn fly haematobia irritans (l.) and on its developmental stability, by fluctuating asymmetry (fa) analysis. breeding media with different sub-lethal diflubenzuron concentrations and a control medium, were prepared to obtain morphometric measures on adult individuals. principal component analysis was used to generate an index of general body size, using the correlation matrix of the original characters. levels of fa and the multivariate index of size were compared among treatments. contrary to the expectations, the exposure to diflubenzuron did not result in a significant and concomitant increase in the level of fa across treatments or in the number of individuals showing developmental instability. nevertheless, a significant reduction of size due to the diflubenzuron may reflect the ability of h. irritans to perform physiological and morphological adjustments allowing phenotype compensation, at least to some extent, for stressful environmental conditions. on the other hand, the igr may be selecting more symmetrical and resistant individuals. from the pest control point of view, the reduction of size may be a positive effect of the igr since size is usually directly related to fitness.
Population Fluctuation of Horn Fly (Haematobia irritans) in an Organic Dairy Farm
Ema Maldonado-Siman,Pedro Arturo Martinez-Hernandez,Hector Sumano-Lopez,Carlos Cruz-Vazquez,Raymundo Rodriguez de Lara,Miguel Angel Alonso-Diaz
Journal of Animal and Veterinary Advances , 2012,
Abstract: Haematobia irritans (Linnaeus) is an economically important pest of livestock. Its infestation causes significant losses in meat and milk production, as well as damaging skin quality. Organic livestock production has increased because of market demands with emphasis on high standards in animal health and welfare and therefore, good production practices are warranted. To achieve this goal, epidemiological studies are needed to devise integrated pest management programs capable of reducing parasite burden to an economic threshold for organic dairy production. Consequently, the objective of the study was to determine Haematobia irritans population seasonality and to relate these changes with weather factors. Field phase was developed in an organic dairy farm located in a Mexican temperate climate throughout a 2 years period (2003 and 2004). Weekly horn fly counts and 4 weathers parameters were measured and correlated for each year and years combined. Flies were found on cattle year round in both years the highest loads were 130 flies cow-1 in 2003 and 255 flies cow-1 in 2004 both in summer. Rainfall showed the highest correlation (r = 0.68) with horn fly in 2004 and for years combined (r = 0.67), while in 2003, it was relative humidity with a correlation of r = 0.75. The lower counts of horn flies on cattle found in winter and early spring were associated with a drier environment and relative lower air temperatures; however, none of the weather factors were severe enough to achieve a complete elimination of flies, the year round presence and summer peaks of flies can be a constraint to animal welfare and production. It was concluded that yearly fly population changes can be associated to weather factors and mild temperatures in winter allows finding flies on cattle year-round.
Dinámica poblacional de Haematobia Irritans en bovinos del Trópico Mexicano
Alonso-Díaz,Miguel ángel; Acosta-Rodríguez,Rebeca; Maldonado-Simán,Ema; Ramírez-Valverde,Rodolfo; Bermúdez-Villanueva,Luis;
Revista Científica , 2007,
Abstract: population dinamic of haematobia irritans on cattle in the mexican tropic. abstract the population fluctuation of haematobia irritans was evaluated in this study from february 2004 to february 2005 at martínez de la torre, veracruz, méxico. distribution of horn fly throughout a year was monitored in 15 heifers f1 (holstein x brahman) of 11±2 months of age and 170±19 kg of weight. in addition, horn fly population was correlated with five weather variables and evaluated by weekly counts with direct observation on grazing cattle. h. irritans was present year round (35.1±35.2 flies/cattle); however, higher infestations of this pest were registered during the months of september and october. population peak of h. irritans was of 121 flies/cattle. the grade of infestation was mainly associated with accumulated rainfall (r = 0.70, p<0.05); nevertheless, other factors as temperature and relative humidity were also important to determine the incidence and severity of the attack of this ecto-parasite. it may be concluded that in this region, h. irritans control must be carried out at the end of the rainy season and at the beginning of windy winter season.
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