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Seasonal occurrence of the bont tick (Amblyomma hebraeum) in the southern lowveld of Zimbabwe

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Abstract

The seasonal occurrence of the bont tickAmblyomma hebraeum was recorded over 2 years on 20 Brahman cattle held in a 240-ha paddock at Mbizi in southeastern Zimbabwe. The cattle were infested with all life cycle stages throughout the study period, and no clearly defined seasonal patterns were recorded. Males remained attached for up to about 6 months, and consequently accumulated on the cattle and outnumbered females considerably. The cattle did not acquire resistance toA. hebraeum and the abundance of the adults increased steadily over the 2 years of sampling. The occurrence of adults and nymphs on hosts appeared to be largely independent of weather, and these stages were active over the entire range of temperature and relative humidity recorded during the study period. It was concluded that unfed adults and nymphs are able to engage in host-seeking irrespective of weather conditions as they do not await hosts on the vegetation but emerge from protected microhabitats in response to specific stimuli from hosts, notably, carbon dioxide and the aggregation-attachment pheromone emitted by attached males. This behavior may explain the reported absence of a consistent pattern of seasonal occurrence ofA. hebraeum at different locations in southeastern Africa.

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Authors and Affiliations

  1. Department of Infectious Diseases, College of Veterinary Medicine, University of Florida, Building 471, Mowry Road, 32611-0633, Gainesville, FL, USA

    R. A. I. Norval, H. R. Andrew & M. I. Meltzer

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  1. R. A. I. Norval
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  2. H. R. Andrew
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  3. M. I. Meltzer
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Norval, R.A.I., Andrew, H.R. & Meltzer, M.I. Seasonal occurrence of the bont tick (Amblyomma hebraeum) in the southern lowveld of Zimbabwe. Exp Appl Acarol 13, 81–96 (1991). https://doi.org/10.1007/BF01193659

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