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Browsing by UP Author "Horak, Ivan Gerard"
Now showing items 1-20 of 165
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Lutermann, Heike; Medger, Katarina; Horak, Ivan Gerard (Wiley-Blackwell, 2012-09)Ticks are important vectors of pathogens of medical and veterinary importance worldwide. Despite their economic importance our current knowledge about the factors affecting tick prevalence and abundance in tropical and ...
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Horak, Ivan Gerard; Mekonnen, Sileshi; Bryson, N.R.; Fourie, L.J.; Peter, R.J.; Spickett, Arthur M.; Taylor, Robin J.; Strydom, T.; Boomker, Jacob Diederik Frederik (Published jointly by the Agricultural Research Council, ARC-Onderstepoort Veterinary Institute and the Faculty of Veterinary Science, University of Pretoria., 2002)A field study (February 2000 to August 2001) was conducted on communal and commercial farms in the Eastern Cape and North-West Provinces of South Africa to detect the levels of tick resistance to commonly used acaricides. ...
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Espinaze, Marcela P.A.; Hellard, Eléonore; Horak, Ivan Gerard; Cumming, Graeme S. (Cambridge University Press, 2016-03)Ticks and tick-borne pathogens can have considerable impacts on the health of livestock, wildlife and people. Knowledge of tick–host preferences is necessary for both tick and pathogen control. Ticks were historically ...
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Guglielmone, Alberto A.; Robbins, Richard G.; Apanaskevich, Dmitry A.; Petney, Trevor N.; Estrada-Pena, Agustín; Horak, Ivan Gerard; Shao, Renfu; Barker, Stephen C. (Magnolia Press, 2010)This work is intended as a consensus list of valid tick names, following recent revisionary studies, wherein we recognize 896 species of ticks in 3 families. The Nuttalliellidae is monotypic, containing the single entity ...
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Horak, Ivan Gerard; Boomker, Jacob Diederik Frederik; Keep, M.E.; Flamand, J.R.B.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1988)Twenty-five common reedbuck, Redunca arundinum, from the Himeville region, 21 from the Eastern Shores Nature Reserve, 4 from the Charter's Creek Nature Reserve and 2 from the St Lucia Game Park, Natal were examined for ...
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Horak, Ivan Gerard; Biggs, H.C.; Reinecke, R.K.; Bigalke, R.D. (Published by The Government Printer, Pretoria, 1984)Twelve Hartmann's mountain zebra, Equus zebra hartmannae, were shot for arthropod parasite recovery during the period June 1980-June 1981 on a farm in the Khomas Hochland region of South West Africa/Namibia. Four species ...
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Horak, Ivan Gerard; Boomker, Jacob Diederik Frederik; Anthonissen, M.; Krecek, R.C.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1992)A total of 48 springbok, 48 gemsbok, 23 kudus and 6 giraffes were examined for ticks and lice, while 9 Burchell's zebras and 6 Hartmann's mountain zebras were examined only for ticks. Springbok and gemsbok were shot in ...
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Horak, Ivan Gerard (Agricultural Research Council, ARC-OVI and the University of Pretoria, 2009-03)Eighty ixodid tick species, 25 argasid tick species and Nuttalliella namaqua occur in South Africa. Twenty-one of the 80 ixodid species and two of the argasid species occur only in this country, while N. namaqua is present ...
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Olwoch, Jane Mukarugwiza; Van Jaarsveld, A.S.; Scholtz, Clarke H.; Horak, Ivan Gerard (Agricultural Research Council, ARC-OVI and the University of Pretoria, 2007-03)The suitability of present and future climates for 30 Rhipicephalus species in Africa are predicted using a simple climate envelope model as well as a Division of Atmospheric Research Limited-Area Model (DARLAM). DARLAM's ...
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Estrada-Pena, Agustín; Horak, Ivan Gerard; Petney, Trevor N. (Elsevier, 2008-02)The spread of Amblyomma hebraeum has been reported in Zimbabwe. At the same time there was little or no spread in the distribution of Amblyomma variegatum. This paper examines the climatic cycles and their trends in the ...
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Guglielmone, Alberto A.; Robbins, Richard G.; Apanaskevich, Dmitry A.; Petney, Trevor N.; Estrada-Pena, Agustín; Horak, Ivan Gerard (Springer, 2009-08)There are numerous discrepancies in recent published lists of the ticks of the world. Here we review the controversial names, presenting evidence for or against their validity and excluding some altogether. We also address ...
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Braack, L.E.O.; Horak, Ivan Gerard; Jordaan, Leonora C.; Louw, J.P.; Segerman, Joyce; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1996)Red veld rats (Aethomys chrysophilus) and bushveld gerbils (Tatera leucogaster) were trapped at monthly intervals, when possible, over a 2-year period, in the southern Kruger National Park, Mpumalanga Province. Forty-six ...
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De Matos, Carlos Antonio; Sitoe, C.; Das Neves, Luis Carlos Bernardo G.; Nothling, Johan Oliviette; Horak, Ivan Gerard (Agricultural Research Council, ARC-OVI and the University of Pretoria, 2009-06)This study compares the prevalence of ixodid tick species on cattle and goats in Maputo Province. Adult ticks as well as the nymphs of three species, and only the adults of two species were collected from sets of five ...
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Fourie, Josephus J.; Horak, Ivan Gerard; De Vos, Christa; Deuster, Katrin; Schunack, Bettina (Springer, 2015-08)Speed of kill, repellent (anti-feeding) and acaricidal efficacy of an imidacloprid 10% (w/w) /flumethrin 4.5% (w/w) collar (Seresto®, Bayer) and a spot-on formulation of fipronil 8.3% (w/v) /(S)-methoprene 10% ...
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Huchzermeyer, Fritz W.; Horak, Ivan Gerard; Putterill, John Fraser; Earle, R.A.; Verwoerd, Daniel Wynand (Pretoria : Agricultural Research Council, Onderstepoort Veterinary Institute., 1992)Aegyptianella botuliformis n. sp. (Rickettsiales: Anaplasmataceae) isolated from helmeted guineafowls Numida meleagris from the Kruger National Park is described. The rickettsia occurs within a membrane-bound vacuole in ...
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Horak, Ivan Gerard; Du Toit, J.S.; Fourie, L.J.; Verwoerd, Daniel Wynand (Pretoria : Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)Detachment rhythms of immature Karoo paralysis ticks (Ixodes rubicundus) from their natural host, the rock elephant shrew (Elephantulus myurus) , were investigated under laboratory and natural conditions. Larvae and nymphs ...
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Harrison, Alan; Bown, Kevin J.; Horak, Ivan Gerard (American Society of Parasitologists, 2011)Ticks are important vectors of numerous pathogens causing illness, fatalities, and economic loss worldwide. Infectious disease episodes are increasing, and novel tick-borne pathogens are described frequently. Identification ...
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Horak, Ivan Gerard; Dower, Kathy M.; Petney, T.N.; Bigalke, R.D. (Pretoria : Government Printer, 1988)The success of natural infestations of various life history stages of Amblyomma hebraeum and Amblyomma marmoreum on the leopard tortoise, Geochelone pardalis, was compared. Success was measured by the time taken for ticks ...
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Harrison, Alan; Robb, Gillian N.; Bennett, Nigel Charles; Horak, Ivan Gerard (Elsevier, 2012-09)Rodents are recognised as important hosts of ixodid ticks and as reservoirs of tick-borne pathogens across the world. Sympatric insectivores are usually inconspicuous and often overlooked as hosts of ticks and reservoirs ...
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Nyangiwe, Nkululeko; Harrison, Alan; Horak, Ivan Gerard (Springer, 2013-11)The objective of the study was to establish to what extent the native tick species Rhipicephalus decoloratus had been displaced by the invasive introduced tick, Rhipicephalus microplus at two communally grazed areas in ...
Now showing items 1-20 of 165