8 documents found, page 1 of 1
Diversity and population dynamic of Tabanidae (Insecta: Diptera) in the Cerrado...
KOLLER, W. W.; BARROS, A. T. M. de; TEODORO, P. E.Tabanid (Diptera) species are associated with the mechanical transmission of several pathogens to both domestic and wild animals around the world. The aim of this study was to evaluate the diversity, abundance, and seasonal dynamic of tabanids in the Cerrado-Pantanal ecotone in Miranda, state of Mato Grosso do Sul, Brazil. Tabanids were collected once a month, from June 2001 to May 2003, for seven consecutive d...
Sampling plants for spittlebug eggs in pastures of Brachiaria decumbens.
NILAKHE, S. S.; MARTIN, P. B.; VALERIO, J. R.; KOLLER, W. W.; SOUZA FILHO, J. A. G. de; SILVA, A. A. daA sampling study of spittlebug eggs in pastures of Brachiaria decumbens was conducted by using a sample unit of 15 x 15 cm. The number os samples required for a certain level of precision was inversely proportional to population density. A crude estimate of number of samples necessary for 10, 15 and 20% of precision were 133,59 and 33, respectively. A study of sampling variation showed that differences between ...
Contributions of the hair sheep breed Santa Ines as a maintenance host for Rhip...
GARCIA, M. V.; ANDREOTTI, R.; REIS, F. A.; AGUIRRE, A. de A. R.; BARROS, J. C.; MATIAS, J.; KOLLER, W. W.Hair sheep breeds are a new, cost-effective option for the diversification of livestock in the Midwest region of Brazil. They are grazed extensively with cattle as well as in isolation in small areas. Hair sheep breeds are ulnerable to infestation by parasites such as the cattle tick, Rhipicephalus microplus, which causes various types of damage and can transmit diseases.; Made available in DSpace on 2018-02-22...
Evaluation of Rhipicephalus (Boophilus) microplus (Acari: Ixodidae) resistance ...
HIGA, L. de O. S.; GARCIA, M. V.; BARROS, J. C.; KOLLER, W. W.; ANDREOTTI, R.The Rhipicephalus (Boophilus) microplus tick is responsible for considerable economic losses in Brazil, causing leather damage, weight loss and reduced milk production in cattle and results in the transmission of pathogens. Currently, the main method for controlling this tick is using acaricides, but their indiscriminate use is one of the major causes of resistance dissemination. In this study, the adult immers...
Insecticide susceptibility of horn flies, Haematobia irritans (Diptera: Muscida...
BARROS, A. T. M.; GOMES, A.; KOLLER, W. W.Horn flies from wild populations were collected on cattle and exposed to filter papers impregnated with cypermethrin, permethrin, or diazinon and mortality was assessed after two hours. Resistance to cypermethrin was detected in all populations, with resistance ratios (RR) ranging from 27.6 to 91.3-fold. Permethrin bioassays provided apparently low levels of resistance (RR<5), however, resistant flies were foun...
Life cycle and parasitic competence of Dermacentor nitens Neumann, 1897 (Acari:...
RODRIGUES, V. da S.; GARCIA, M. V.; CRUZ, B. C.; MACIEL, W. G.; ZIMMERMANN, N. P.; KOLLER, W. W.; BARROS, J. C.; ANDREOTTI, R.The objective of this study was to evaluate the life cycle and parasitic competence of Dermacentor nitens(Neumann, 1897) on different animal species. Experimental infestations were induced in five specimenseach of seven species of possible hosts: rabbits, horses, sheep, cows, guinea pigs, birds and dogs. Rabbitswere infested in the ear using artificial feeding chambers, and the horses, sheep, cows and dogs were...
Contributions of the woolless sheep as a host for the maintenance of Rhipicepha...
GARCIA, M. V.; ANDREOTTI, R.; REIS, F. A.; AGUIRRE, A. de A. R.; BARROS, J. C.; MATIAS, J.; KOLLER, W. W.Abstract: BackgroundHair sheep breeds are a new, cost-effective option for the diversification of livestock in the Midwest region of Brazil. They are grazed extensively with cattle as well as in isolation in small areas. Hair sheep breeds are vulnerable to infestation by parasites such as the cattle tick, Rhipicephalus microplus, which causes various types of damage and can transmit diseases.MethodsIn this stud...
Susceptibility of the horn fly, Haematobia irritans irritans (Diptera: Muscidae...
BARROS, A. T. M. de; SAUERESSIG, T. M.; GOMES, A.; KOLLER, W. W.; FURLONG, J.; GIRÃO, E. S.; PINHEIRO, A. da C.; ALVES-BRANCO, F. de P. J.Since horn fly populations became established throughout Brazil, complaints regarding control failure have increased around the country. A broad survey to evaluate the susceptibility of horn flies to both organophosphate (OP) and pyrethroid insecticides was conducted from October 2000 to April 2003. Bioassays using filter papers impregnated with cypermethrin, permethrin or diazinon were conducted on 154 horn fl...