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An innovation hub for the woolgrowers of Australia

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02.06.2023 Source: AWEX
AWEX EMI 1209 -5
Micron 17 2078 +15
Micron 18 1758 +33
Micron 19 1528 +1
Micron 20 1406 +8
Micron 21 1353 -11
Micron 22 1295n -24
Micron 26 522n -20
Micron 28 317 -6
Micron 30 288 -4
Micron 32 237 +2
MCar 738 -23
Causal webs are used to depict the relationship between multiple different factors that all contribute to the cause of a disease.

Here is a link to a PDF of the Causal Web of Ovine Breech Flystrike in Australia.

The circles contain the risk factors that we know about, whilst the lines are attempts to capture the interactions between the risk factors. It is likely that there are further risk factors and interactions that have been missed from this image and on-going research in this area may identify further risk factors that are, as yet, unknown.

This causal web highlights the complexities of the task Australian woolgrowers face with respect to managing this significant disease and the challenges involved in identifying solutions for its prevention that meet the diverse range of sheep type, environment and farm business priorities under which they operate. It demonstrates why growers require an integrated pest management approach to reducing the risk of flystrike, relying on a range of tools.

Below is an example for a causal web for bovine hypomagnesaemia (Grass Staggers in cattle).


Source: Thrusfield M.; Christley R. 2018. Veterinary Epidemiology Fourth Edition, John Wiley & Sons Ltd, Oxford, UK, Page 52.

Information on the many current or recently completed projects, delivered under AWI’s Flystrike Research, Development, Education, Extension and Communication program, is available at

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Welfare improved management practices to reduce the risk of flystrike. Read more