Flystrike – Sheep

Merino Sheep

With current seasonal conditions being very favourable for flies, this could be shaping up as one of biggest flystrike risk seasons in many years. Are you prepared?

There are a number of costs associated with flystrike –decreased wool growth, tender wool, decreased ewe reproductive performance and deaths. Developing and implementing a flystrike plan that integrates both non-chemical and chemical management, will greatly assist you to decrease your risk of flystrike.

Cause of flystrike:
• Lucilia cuprina: The female ‘green’ fly initiates greater than 90% of strikes. The ‘secondary green’ (Hairy Maggot Blowfly) causes secondary strikes.
• Accumulation of dags: Can typically be caused by scouring due to high worm burden, lush green feed or overfeeding grain.
• Wet fleece: Provides favourable conditions for body strike.

Risky Situations: • Air temperature: 18 to 38oC
• Soil temperature: Greater than 15oC
• Wind speed: Less than 30km/hr
• Humid conditions/after rain: Body strike risk
• Breech wrinkle and wool cover: Excessive wrinkle and wool cover over the breech area allows wet dags and stain to create an environment conducive to the laying and hatching of blowfly larvae.
• Other strike: Sweat around the base of horns can trigger flystrike.
• Wounds: Marking wounds can trigger flystrike. Wounds from rams fighting are also entry points.


Product WHP Meat ESI HWHP Wool Protection Length
Extinosad Eliminator Nil Nil Nil Up to 8 days

Note: Proguard and Clik do not kill existing maggots.

• Withholding periods and length of protection

Product WHP Meat ESI WHP Wool Protection Length
Backliner (off shears/short wool) Clik 28 days 120 days 90 days 18-24 weeks
Avenge 21 days 63 days Refer label Up to 10 weeks
Hand jetting (long wool) Extinosad Eliminator Nil Nil Nil Up to 5 weeks
Proguard Liquid 7 days 21 days 60 days 14 weeks
Zinjet 7 days 7 days 42 days Up to 12 weeks
Backliner (long wool) Proguard 7 days 28 days 60 days 11 weeks
Clik 28 days 120 days 90 days 18-24 weeks
Clik Zin 7 days 21 days 30 days 11 weeks

** ‘Long wool’ includes wool length 6 weeks post shearing.*

Contact the friendly staff at Nutrien Ag Solutions Young on (02) 6382 7600 or call in and see us at 99 Lovell St, Young.

Stay Connected

    Get in Contact

Hilltops News to your inbox

Sign up now for the latest news from the Hilltops Area direct to your inbox.

You might also like


91 Boorowa Street, Young NSW 2594


Phone 0474 159 981


Phone 0474 159 981


We are always looking for new articles of interest to the local community.

Please feel free to submit an article for possible inclusion in a future issue.

To submit an article, click here to use our online article submission form.


Hilltops Phoenix FacebookHilltops Phoenix InstagramHilltops Phoenix YoutubeHilltops Phoenix Subscribe
About UsJournalistic Ethics and Complaints PolicyConflict ResolutionPrivacy PolicySite MapRSS Feed