Flystrike – Sheep

Merino Sheep
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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.

Treatment:

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.

Prevention:
• 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.

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