Queensland Itch, Itchy Mane and Tail, Sweet Itch, Sweat Itch, Summer Itch or Summer Eczema

Understanding Queensland Itch: environment, exposure and management

Queensland Itch begins with something almost invisible.

The insects responsible are Culicoides midges — minute biting flies that thrive in damp, low-lying environments. They breed in wet or muddy areas including freshwater and salt marshes, estuaries, slow-moving rivers and streams, ponds, lakes, and even decomposing organic matter such as wet leaves or compost. Where moisture lingers, midges follow.

Midges are most active at dawn and dusk, often appearing in swarms. On cooler, humid days they may remain active throughout daylight hours, and on warm nights they can continue biting well after dark. For horses living in midge-dense environments, avoidance can feel impossible.

When bitten, many horses show immediate signs of discomfort — tail swishing, stamping, rubbing, or sudden bursts of movement as they attempt to escape the irritation. For some horses, the reaction doesn’t stop there.

A proportion develop a true allergic hypersensitivity to midge saliva, historically referred to as Sweet Itch, Summer Itch or Queensland Itch, depending on region. Research suggests prevalence varies widely internationally — from around 3% in some British horse populations to over 20% in parts of Israel and British Columbia, and reports of up to 60% in Queensland. There also appears to be a genetic component, with susceptibility more commonly linked to the dam than the sire and associated with immune system (major histocompatibility complex) genes.

In Australia, Queensland is often referenced as a high-risk region, but Culicoides midges are widespread and cases occur across multiple states; local humidity, rainfall and proximity to wet breeding sites tend to matter more than state lines. From a biological perspective, midges respond to microclimates — not borders. Horses living near wetlands, river systems, floodplains, irrigated paddocks or areas with poor drainage may experience similar exposure regardless of which state they are in.

This also helps explain why Queensland Itch can appear suddenly in horses that have never shown symptoms before. Changes in rainfall, land use, weather patterns or management can increase midge exposure, tipping a horse from tolerance into hypersensitivity.

Midges commonly bite along the dorsal surface of the horse — including the forehead, ears, poll, withers, back, rump and the base of the tail. Repeated biting combined with rubbing and scratching can quickly lead to broken skin, inflammation and secondary complications.

At present, there is no definitive cure for Queensland Itch. Management focuses on reducing exposure wherever possible and supporting the skin during periods of irritation.

In 2020, a clinical trial published in the Australian Veterinary Journal investigated a topical spray formulated with a blend of essential oils in horses affected by insect bite hypersensitivity. While the specific ingredients were not disclosed, the formulation was described as providing anti-itch, anti-inflammatory and insect-repellent effects. Horses treated with the spray showed a significant reduction in itching, skin thickening, hair loss and excoriation compared with placebo. While not a cure, the study reinforces the value of topical barrier and repellent strategies as part of a broader management approach.

The most effective strategies are layered — combining physical protection, environmental management, topical support and nutritional care — tailored to the individual horse and their surroundings.

 

 

How our products fit into Queensland Itch management

Queensland Itch is best managed with a layered approach — reducing insect exposure, supporting the skin barrier, and helping the skin remain calm and resilient during high midge-pressure periods.

Reduce insect contact (barrier support)

 

Repeated midge bites are the primary trigger for irritation and allergic reactions.

Tropical Spray and Paddock Spray are used as part of a barrier strategy to help discourage insect landing and biting, particularly during peak activity times such as dawn, dusk, warm nights and humid days.

 

Soothe and support irritated skin (topical comfort)

 

For horses already showing signs of irritation, rubbing or skin sensitivity, gentle topical care can help support comfort while the skin recovers.

Soothing & Calm Aloe Vera Gel and Aloe Vera Spray are designed to help cool and calm compromised skin, providing hydration and surface comfort during flare-ups.

Support skin health from within (nutritional support)

 

Skin resilience plays an important role in how horses cope with repeated environmental challenges.

DERMAblend Horse Skin & Coat Supplement is formulated to support normal skin integrity and coat condition as part of an ongoing wellness routine — particularly for horses prone to seasonal irritation.

Part of a broader management plan

These products are most effective when used alongside:

• breathable fly or mesh rugs
• fly masks and physical barriers
• paddock and drainage management
• consistent routines during high-risk seasons

Queensland Itch rarely has a single solution. Management works best when exposure, skin response and long-term support are addressed together — with care, consistency and attention to the individual horse.