Evaluating the economic damage threshold for bont tick (Amblyomma hebraeum) control in Zimbabwe
โ Scribed by M. I. Meltzer; R. A. I. Norval
- Publisher
- Springer Netherlands
- Year
- 1993
- Tongue
- English
- Weight
- 942 KB
- Volume
- 17
- Category
- Article
- ISSN
- 0168-8162
No coin nor oath required. For personal study only.
โฆ Synopsis
Controlling ticks and tick-borne diseases by frequent applications of acaricides (e.g., dipping) is costly, and can leave treated livestock vulnerable to epizootics of tick-borne diseases should the system of applying acaricides break down. The concept of only applying acaricides on an infrequent (strategic) basis often relies on the tkrget tick population displaying a seasonal cycle. However, as adult bont tick (Arnblyomma hebraeum) infestations in Zimbabwe's lowveld do not have a strictly seasonal pattern of occurrence, it is recommended that tick control only be applied when bont tick infestations are equal to, or greater than, their economic damage threshold. The economic damage threshold is the minimum average weekly standard female tick burden sufficient to cause damage equal in dollar value to the costs of applying tick control. Assuming that each standard female tick represents a t0 gram weight loss, the economic damage threshold (standard female ticks/week) is equivalent to the ratio of the producer price of beef (liveweight equivalent): per head cost of dipping (Eqn (3)). To illustrate the application of the threshold methodology, it was assumed that the producer price of beef was Z$1.63/kg (U.
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