Fly Strike and Parasite Watch: Late Summer Livestock Care in a Dry UK Summer

After one of the hottest and driest summers on record, UK livestock farmers are facing a perfect storm of late-season challenges. While dry weather can reduce some parasite burdens, it also brings its own risks, especially when it comes to fly strike and internal parasites that thrive in stressed animals and patchy pasture.

Here’s how to stay ahead of the curve and protect your flock and herd as summer winds down.

Fly Strike: Still a Threat in Dry Conditions

Despite the lack of rain, fly strike remains a serious concern, especially in sheep.

Why It’s Still a Risk:

Warmth accelerates fly activity. Blowflies are still laying eggs, and larvae can develop rapidly in hot conditions.
Dry pastures mean dust and sweat. These irritants can cause skin abrasions, attracting flies.
Scouring from drought-stressed forage. Loose dung increases strike risk around the breech.

Prevention Tips:

Dag and crutch regularly. Keep the breech area clean and dry.
Use preventative treatments. Apply pour-ons or dips with protection against blowfly larvae, check withdrawal periods carefully.
Monitor high-risk groups. Lambs, older sheep, and those with wounds or footrot are particularly vulnerable.
Inspect daily. Early detection is key, look for agitation, nibbling, or staining around the tail.

Tip: Consider using fly traps around housing and water points to reduce local fly populations.

Internal Parasites: A Shifting Landscape

Hot, dry weather can suppress some worm burdens, but it’s not all good news.

What to Watch For:

Barber’s Pole Worm (Haemonchus contortus): Thrives in warm conditions and causes anaemia, not scouring, look for pale gums and lethargy.
Liver Fluke: Dry summers may reduce snail habitats, but risk rebounds quickly after rain. Be alert as conditions change.
Reduced pasture quality: Poor forage forces animals to graze closer to the ground, increasing exposure to infective larvae.

Management Strategies:

Faecal Egg Counts (FECs): Don’t guess, test. Target treatments based on actual burden.
Strategic worming: Avoid blanket treatments. Rotate actives to prevent resistance.
Pasture rotation: Rest heavily grazed areas and avoid overstocking.
Trace element support: Drought-stressed animals may be deficient in copper, cobalt, or selenium, consider boluses or drenches.

Tip: Remember, resistance is rising. Work with your vet or advisor to build a sustainable parasite control plan.

Cattle Considerations: Heat Stress and Parasite Pressure

Cattle aren’t immune to late summer challenges either.

Heat stress: Provide shade and clean water. Watch for panting, drooling, and reduced feed intake.
Lice and mites: Dry weather can trigger outbreaks, inspect skin and coat condition.
Worms in calves: Youngstock grazing short, dry pasture may be at higher risk. Monitor weight gain and dung consistency.

Late summer care isn’t just about reacting, it’s about anticipating. With unpredictable weather patterns and stressed pasture, livestock are more vulnerable than usual. Fly strike and parasites may not follow the usual seasonal rules this year, so adapt your approach accordingly.

Daily checks, smart treatments, and proactive pasture management will help you finish the season strong, and set the stage for a healthier autumn.