Blowfly is the main external parasite traditionally affecting sheep in the summer months. Changing weather patterns have resulted in an increasingly unpredictable and lengthening season: it is now not uncommon to hear of strike as early as February and as late as November1.

Blowfly strike can occur quickly, and with devastating results, in warm, humid weather and despite being an annual problem, and entirely preventable, over 90% of farmers have been caught out by blowfly strike in the past1.

Lucilia sericata (Greenbottle) is the most common blowfly to parasitise sheep in Ireland. Soil temperatures of 9oC will stimulate overwintering larvae to hatch.

Agriland is running a Blowfly outbreak monitoring campaign across Ireland. Check out the interactive map below to see if your region has been affected.

Submit a report if you’ve been affected to be in with a chance to win one of 10 fleeces courtesy by Elanco.


No Blowfly
Strike Reported
Blowfly Strike
Cases Reported
High Incidences
Of Blowfly Strike

10 people chosen at random will receive a CLiK EXTRA branded fleece!

What is the scientific name for the "green bottle" fly which causes flystrike on sheep?

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CLiK EXTRA container
  • Long-lasting3, 19-weeks prevention.
  • 40 day meat withold.
  • Trusted CLiK™ formulation: dicyclanil (IGR) and FleeceBind™ technology.
  • Meets the challenge of a variable blowfly season.
  • Full fleece protection*.
  • Suitable for ewes and lambs with any fleece length.
  • Save time: use off shears, no need to re-gather sheep.
  • Ideal for early application, full season protection of lambs.
  • Long-lasting, 16-week cover minimises labour
  • 40 day meat withold.
  • Contains dicyclanil (IGR) and FleeceBind™ technology.
  • Full fleece protection*.
  • Suitable for ewes and lambs with any fleece length.
  • Save time: use off shears, no need to re-gather sheep.
  • Ideal for ewes post shearing.
CLiK container
  • 8 weeks blowfly protection – just 7 days meat withhold
  • 7 day meat withold offers flexibility.
  • Contains dicyclanil (IGR) and FleeceBind™ technology.
  • Full fleece protection*.
  • Suitable for use on all stock including lambs for market.
  • Ideal for offering valuable flexibility when marketing lambs.
CLiKZin container

Blowfly Strike: the facts

As the primary ectoparasite affecting sheep in spring and summer, blowfly strike is unfortunately often a familiar problem on sheep farms.

As soon as soil temperatures reach 9°C, the overwintering fly larvae mature and emerge as flies, which in turn deposit thousands of eggs onto sheep. If not properly controlled, sheep farmers can be left facing serious welfare and productivity issues, while the financial consequences can be significant. Agitation, dejection, odour and shedding of wool are all potential symptoms of a struck animal.

Did you know?

Why use an IGR with FleeceBind™?

Insect Growth Regulators (IGRs) prevent blowfly larvae developing into the harmful second and third stage maggots responsible for flystrike. Consequences of blowfly strike can be costly. Figures from 2015 show blowfly strike costs the sheep industry some £2.2m per year. In addition to animal deaths, there are losses from damaged wool and fleeces, plus the cost of treatment and strike control.2

“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 strike1, 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 has the benefit of full fleece* protection. ”

The CLiK family of products with Fleecebind spread and binds

The benefits of CLiK and CLiKZiN with Fleecebind™
  • CLiK EXTRA, CLiK and CLiKZiN are the only IGRs with FleeceBind™ technology, providing full fleece protection*.
  • Spreads from tip to base of fleece, around the animal and onto new wool growth.
  • Binds the formulation strongly in place and sticks to the wool even if applied to damp fleece.
  • Provides consistent protection, practical cover and resistance to washout.
“Many farmers will wait and apply later due to perceived savings in treatment cost, but this is a false economy as the duration of efficacy for some products is so long anyway. Earlier application in the year means better protection as well as a smaller lamb and a potentially smaller dose, which is a genuine saving.”

Correct application

To make the most of their medicines and money – and ensure length of cover is achieved – farmers must always use the correct applicator and follow application instructions.

CLiK EXTRA, CLiK & CLiKZiN - the 4-stroke method

When applying CLiK EXTRA, CLiK or CLiKZiN use the 4-stroke method to ensure an accurate spread. Apply the total required dose one quarter at a time. Best results will be achieved by holding the gun approximately 45cm from the sheep during application. Always calibrate your applicator gun and dose to the heaviest in the group.

If there are large variations in weight it may be best to split the group.

4 Stroke Application Method