Learning Center · Fly & UV

Do gnats and no-see-ums need a different fly spray than flies?

Gnats and no-see-ums slip past sprays built for horseflies, so label wording and coverage matter more than the brand.

By The Schneiders Product Team · Updated September 29, 2026
3 minute read · Reviewed against our current catalog

The short answer

Often a different one. Gnats and no-see-ums are small enough to get through what stops a horsefly, so look for a repellent that specifically lists gnats, midges, or Culicoides on the label. They feed at dawn and dusk and concentrate on the belly, ears, and mane, so physical coverage usually helps more than spray alone.

Why size changes which product works Why timing and location matter as much as the product Why coverage often beats spray for these bugs When it's not just bugs

Start here

Why size changes which product works

A repellent's active ingredient may work broadly across insects, but the formulation, droplet size, and how it sits on the coat are often tuned for a specific pest size. Horseflies and stable flies are large enough that a standard barrier spray sitting on top of the hair coat is enough to deter them. Gnats and no-see-ums are tiny enough to land between hairs and reach skin that a coat-surface spray doesn't fully cover, which is why a product that performs well against flies can still leave a horse getting bitten by midges.

How it works

Why timing and location matter as much as the product

Gnats and no-see-ums are most active at dawn and dusk, not through the heat of the day like many flies, so spraying once in the morning may miss their peak activity entirely. They also concentrate on specific areas: the belly, the inside of the ears, the mane, and the tail head, where skin is thinner or hair is finer. A spray applied evenly across the body but skipped on the belly and ears is treating the wrong map for this particular pest.

What that means for you

Why coverage often beats spray for these bugs

Because gnats target specific thin-skinned areas rather than the whole body, physical barriers on those areas do more good than reapplying spray several times a day. A fly sheet with real belly coverage keeps the belly and flank protected around the clock, and a mask with ears protects the areas gnats favor most. This is why bellyband styles built with fuller coverage, like the Mosquito Mesh II VTEK Adjusta-Fit, work well for horses being bothered by small bugs, and why the tighter weave in the Mosquito Mesh line matters more than mesh density for larger flies.

The details

When it's not just bugs

If your horse is rubbing his mane or tail raw, or the skin reaction looks more severe than ordinary bite irritation, coverage and spray changes may not be enough on their own. That pattern can point toward a sensitivity that's worth discussing with your vet rather than solving with another product purchase. For the broader picture on managing fall bug and weather transitions together, see When do I switch from a fly sheet to a rain sheet?

Mentioned in this entry

Schneiders® Mosquito Mesh® II VTEK® Adjusta-Fit® Bellyband Fly Sheet View ›

Quick answers

Frequently asked questions

How do I know if it's gnats and not regular flies?

Gnats and no-see-ums are much smaller than horseflies or stable flies, bite mostly at dawn and dusk, and concentrate their bites on the belly, ears, mane, and tail head rather than spreading evenly over the body. If your horse is reacting most at those specific spots and mainly early or late in the day, gnats are a likely cause.

Why doesn't my regular fly spray work on gnats?

Standard fly sprays are often formulated to sit on the coat surface, which is enough to deter larger flies but not small enough insects that can land between hairs and reach skin directly. A label that specifically lists gnats, midges, or Culicoides has usually been tested and formulated for that finer target.

Does a fly sheet actually help against gnats?

Yes, particularly one with belly coverage, since gnats target the belly and flank where skin is thinner. A physical barrier over those areas works around the clock without needing reapplication, which makes it more reliable against gnats than spray alone, especially during their peak dawn and dusk activity windows.

My horse is rubbing his mane raw. Is that gnats or something else?

It could be either. Gnat bites along the mane and tail head commonly cause rubbing, but a reaction this severe can also indicate a skin sensitivity that goes beyond ordinary bug irritation. If coverage and spray changes don't reduce the rubbing within a reasonable period, it's worth having your veterinarian take a look.