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Long Lasting Fly Control – Zermasect

Flies cause major economic production losses in livestock. They attack, irritate and feed on cattle and sheep; reducing feed intake, productivity and damaging hides and fleeces.

Their life cycles are completed very quickly, giving rise to very rapid population expansions, highlighting the need to apply fly control medicines early in the season.



Nuisance flies can spread disease such as ‘pink eye’ and summer mastitis amongst cattle. Midges add to these, spreading diseases such as the Schmallenberg virus.
The production loss caused by flies can be up to 0.3kg a day growth rate loss and up to 0.5l a day milk loss by fly worry. 1

Lice:  Reduce lying time and feeding leading to reduced weight gain

Mites: Reduce time spent eating leading to lower daily live weight gain



In summer, blowfly are often the most economically important external parasite, do not underestimate the effects of nuisance and biting flies, including midges with the recent spread of Schmallenberg virus.

Studies have shown that fly worry has caused weight loss of up to 5.5kg over four to six days and it took up to 36 days to regain their original bodyweight.2

Wool production has also been shown to be reduced by blowfly strike by up to 26%, and this is thought to be stress-related.2

Lice: Reduce weight gain and decrease in wool value

Ticks: Spread diseases that have dramatic effects on livestock. Louping ill, tick bourne fever and tick pyaemia are all transmitted by ticks and cause significant production losses. Lyme disease is also transmitted by ticks and can cause severe disease in humans, dogs and horses.

ZERMASECT® Cattle Pour-On
• Low 10ml flat rate dose
• Lasts up to 4-5 weeks against nuisance flies
• Lasts up to 8 weeks against biting horn fly
• Effective against lice
• Cost effective fly and lice control for cattle

ZERMASECT® Sheep Pour-On
• Long lasting fly and tick control for sheep
• Up to 8-10 weeks prevention of blowfly strike
• Treats existing blowfly cases
• Long lasting tick control 8-12 weeks
• Treats lice

Zermasect® Cattle Pour-On Solution 15g/litre and Zermasect Sheep Pour-on solution 12.5g/litre contain alphacypermethrin POM-VPS. For further information see the SPC, farmers should contact their animal medicines supplier SQP, veterinary surgeon or Downland Marketing Ltd, 15 Victoria Place, Carlisle, CA1 1EW. Use medicines responsibly: AH255/18
1. Jonsson et al (1999). Med. Vet. Entomology 13, p372-376.
2. Australian sheep animal welfare senate meeting 1985.

14th June 2019

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