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Factors affecting the distributions of the ticks Amblyomma hebraeum and A. variegatum in Zimbabwe: implications of reduced acaricide usage by R. A. I. Norval; B. D. Perry; M. I. Meltzer; R. L. Kruska; T. H. Booth is a Agricultural and Biological Sciences article available to read on EtoBox.

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The ticks Amblyomma hebraeum and A. variegatum are the main vectors of heartwater, a disease of ruminants caused by Cowdria ruminantium, in the agricultural areas of Zimbabwe. At present, A. hebraeum is widely distributed in the dry southern lowveld, and occurs in at least seven foci in the higher rainfall highveld. Amblyonm2a variegatum occurs in the Zambezi valley and surrounding dr 3, lowveld areas in the northwest. The distribution ofA. hebraeum has changed considerably over the past 70 years, while that of A. variegatum appears to have remained fairly static. The distribution patterns of both species in Zimbabwe display anomalous features; the ticks occur in areas of lowest predicted climatic suitability for survival and development and in areas where the densities of cattle, the most important domestic host, are lowest. The only factor favouring the survival of the species in the lowveld habitats in which they occur is the presence of alternative wildlife hosts for the adult stage. Their absence from more climatically favourable highveld habitats appears to have been the result of intensive acaricide treatment of cattle over a long period and a historic absence of significant

Who reads Factors affecting the distributions of the ticks Amblyomma hebraeum and A. variegatum in Zimbabwe: implications of reduced acaricide usage?

Author

R. A. I. Norval; B. D. Perry; M. I. Meltzer; R. L. Kruska; T. H. Booth

Publisher

Springer Netherlands; Springer-Verlag; Kluwer Academic Publishers; Springer Science and Business Media LLC (ISSN 0168-8162)

Published

1994

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)