NADIS & Elanco issue Blowfly Alert update

Real-time updates on blowfly risk – produced via an ongoing collaboration between Elanco and NADIS (National Animal Disease Information Service) – now shows the risk level increasing to “high”across more regions of the country.

Richard Wall, Professor of Zoology (Ectoparasite Specialist) and compiler of the Blowfly Risk Alerts, said: “Strike risk continues to build as the fly population increases, and continued vigilance is required particularly associated with summer rain because blowflies are more likely to lay eggs on wet sheep. Be particularly careful about strike on any scouring lambs.”

NADIS map key:

  • Low risk: no significant risk;
  • Medium risk: One in 2,500 animals might be struck;
  • High risk: One in 500 animals might be struck;
  • Severe risk: One in 100 animals might be struck;

Kate Heller, Elanco’s ruminant technical consultant, said: “Farmers are being urged to ‘strike first’ with preventative treatments rather than risk devastation to their own flock. Using protection early reduces risk later in the season by ensuring a much lower fly count as the season progresses.

“A lot of farmers think “it’s not in my control” because of bad weather or other circumstances. They’re unnecessarily putting limits on themselves. Blowfly strike is not an inevitable part of farming and can be mostly avoided with the right management strategy.”

“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. There are no guarantees when it comes to blowfly strike – with significant levels identified into November, an essential part of any strategy, has to ensure an early treatment that extends right through the long season.”

National Farm Research blowfly study
Results of an Elanco blowfly study conducted in partnership with the National Farm Research Unit found that 99% of farmers having suffered financial losses as a result of blowfly strike. While 82% agree that the blowfly season is getting longer, with cases of strike being reported as early as February and as late as November.2

The cost
The consequences of blowfly strike can be devastating, leading to production losses and welfare problems. By comparison, preventing blowfly strike using a long-lasting product can offer not only peace of mind but can also be economical in terms of time, money and effort.


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