Blowfly Alert and tracker now live – alerting farmers to early blowfly threat

As spring approaches so does the threat of blowfly strike, leaving farms across the country vulnerable and at risk. A National Farm Research Unit study showed that only 51% of farms have incorporated preventative treatment earlier in the year to guard against strike1, leaving almost half of all farms exposed. To combat this issue, a continued collaboration between Elanco Animal Health and NADIS (National Animal Disease Information Service) will bring sheep farmers real time updates on blowfly risk and reported strike cases with expert advice to help alert farmers, vets and industry professionals.

The trackers will include forecast and reported blowfly strike cases. The NADIS Blowfly Alert will be put together with information from Professor Richard Wall of the University of Bristol, based on a detailed weather-driven simulation model and will provide a regular blowfly-risk forecast outlining the blowfly challenge facing sheep across the different UK regions.

“Our blowfly forecast model is built on many years of detailed research” says Richard “so it’s great to now be able to use it to predict the seasonal change in strike risk and to give farmers advance warning in a way that helps with their blowfly preparations.”

The timing and severity of blowfly strike is strongly influenced by the weather. Spring temperatures are more variable and harder to predict, making it difficult to determine when to treat. Kate Heller, Technical Vet at Elanco says, “delaying preventative treatment, not only costs the farm but risks the welfare and productivity of the flock.”

 “The costs of inaction when it comes to blowfly strike far outweigh the costs of protection. With 99% of farmers having suffered financial losses as a result of blowfly strike2, the potential impact on your flock simply isn’t worth the risk. Farms need to take control — and take control early — by using a preventative IGR product with full fleece protection*.”

Henry Riley, previously a Flock Manager at a farm hit by blowfly, is clear that just monitoring symptoms is not an effective strategy. “By the time symptoms show themselves, it’s often too late. It’s easy to overlook even one affected sheep, and blowfly strike can cause huge damage in very little time. By switching to a preventative approach earlier, we saw a huge difference. We only encountered one case of strike – previously it had been thirty”. 

Using a preventative product earlier reduces risk later in the season by ensuring a much lower fly count as the season progresses3.

“Choose a system that gives you control over your farm,” added Kate. “When farmers are looking at treatment options, they need to look for the longest protection with an IGR that binds to the fleece – It is now possible to get 19 weeks blowfly strike prevention.”

To report a case of blowfly strike on your farm, and alert farmers in your area, go to  

To see the latest risk data for your region visit the NADIS Blowfly Alert on 


*Spreads to areas covered by fleece, other areas may not be protected, including the feet.

1 National Farm Research Unit, Blowfly Study March 2018

2 Elanco survey via NSA of 130 sheep farmers, April 2016

3 Richard Wall and Fiona Lovatt (2015). Blowfly strike: biology, epidemiology and control, In Practice    37:181-188 doi:10.1136/inp.h1434.

 For further information call Elanco Animal Health on +44 (0) 1256 353131 or write to Elanco Animal Health, Lilly House, Priestley Road, Basingstoke, Hampshire, RG24 9NL.

CLiKTM EXTRA contains 65mg/ml dicyclanil. Legal category: POM-VPS in UK. The product is indicated for the prevention of blowfly strike on sheep caused by Lucilia sercata or Wohlfahrtia magnifica. Information regarding the side effects, precautions, warnings and contra-indications can be found in product packaging and leaflets; further information can also be found in the Summary of Product Characteristics. Advice should be sought from the medicine prescriber. Elanco, CLiK EXTRA, FleeceBind and the diagonal bar logo are trademarks of Elanco or its affiliates.

©2019 Elanco or its affiliates. Further information is available from the Summary of Product Characteristics. Use Medicines Responsibly (  PM-UK-19-0259


For further press information from NADIS please contact:

Janet Woodhart at



NADIS was formed in 1995 to promote animal health and welfare through better disease control and prevention. NADIS recognises this is best achieved by active veterinary health planning. Key to improving health is disease surveillance and veterinary based, animal health Knowledge Transfer, delivered to farmers by their veterinary surgeon. Visit