What Bugs Does Lemon Eucalyptus Repel?
Registered repellents that use oil of lemon eucalyptus (OLE) or PMD have the best evidence against mosquitoes and some evidence for ticks. For gnats, biting midges, black flies and other pests, the evidence is thin or mixed, and the product's own label decides what it may claim. The essential oil we sell is not a registered repellent.
Lemon Eucalyptus Essential Oil
Our own Lemon Eucalyptus Essential Oil, in sizes from 0.5 oz to bulk.
From $9.99
Shop Now →Most pages on this topic list a dozen insects with a green check mark beside each. That format hides the one thing a buyer needs: how strong the evidence is for each pest, and where it comes from. This page goes pest by pest, says what we could verify, and marks what we could not. For the background on the ingredient itself, see our guide to OLE and PMD.
First, which "lemon eucalyptus" are we talking about?
Everything below concerns EPA-registered repellents whose active ingredient is OLE or PMD. CDC lists both among its recommended active ingredients, next to DEET, picaridin, IR3535 and 2-undecanone. CDC does not recommend "pure" lemon eucalyptus oil as a repellent, because it has not undergone validated testing and is not registered with EPA. Our bottle falls in that second group, and nothing in the table below applies to it. The difference is spelled out in our comparison of the two materials.
The pest-by-pest scorecard
"Strength" here is our plain-language judgment of how much verifiable evidence we found, not an official rating. Label claims vary by product, so the last column is the deciding step.
| Pest | What we could verify | Strength of evidence | What to check on the label |
|---|---|---|---|
| Mosquitoes | CDC lists OLE and PMD as recommended actives. A 2006 review covers PMD against Aedes, Anopheles, Culex and Ochlerotatus mosquitoes, with field and laboratory comparisons against high-concentration DEET. | Strongest | The protection time and whether mosquitoes are named. One lemon eucalyptus label we read states the product is designed to repel mosquitoes for up to 6 hours. |
| Ticks | One Swedish field trial of a lemon eucalyptus extract (Citriodiol) against Ixodes ricinus. CDC says registered repellents also work on ticks in general. | Moderate for that product, limited overall | Whether ticks are named. EPA's graphic can show mosquitoes, ticks, or both. |
| Sand flies | CDC says registered repellents reduce biting by insects such as mosquitoes and sand flies. We found no study specific to OLE or PMD. | General statement only | Whether sand flies are named at all. |
| Biting midges (no-see-ums) | A 2016 light-trap experiment with DEET/PMD-treated mesh caught three to four times more midges of one group, which the authors flagged as hard to interpret. | Unclear | Whether midges or "no-see-ums" are named. Many labels do not. |
| Black flies | A 2026 laboratory feeding system tested one 30% OLE product on one black fly species. | Preliminary, lab only | Whether black flies are named. |
| Mites and chiggers | CDC says registered repellents work on other arthropods, such as ticks and mites. We found no OLE-specific study. | General statement only | Whether mites or chiggers are named. |
| Gnats, deer flies, horse flies | No EPA-evaluated claim and no study we could open. | None verified | Do not assume. |
Mosquitoes: where the evidence is strongest
The mosquito case rests on registered products, not on the leaf oil. The 2006 review by Carroll and Loye describes PMD as a spent product of the distillation of lemon-scented gum leaves, summarizes its performance against four mosquito groups, and presents field and laboratory data comparing it with high-concentration DEET. Its authors concluded that CDC's 2005 endorsement was warranted and probably understated PMD's value. It is a single review, so read it as one well-documented source rather than the last word. For a plain-English walk through the studies, see does lemon eucalyptus repel mosquitoes.
Ticks: one product, one species, self-reported counts
The tick evidence is real but narrower than the headline suggests. In a 2004 cross-over field trial, 111 healthy adults in two heavily infested areas in Sweden applied a Citriodiol spray to the lower legs daily for two weeks, then went two weeks without any repellent, or the reverse. Volunteers kept diaries. They reported 42 attached ticks during spray weeks and 112 during no-spray weeks. The median fell from 1.5 to 0.5 attached ticks per person, and ticks found below the waist were 31% of the total with the spray and 65% without.
Three limits matter. The comparison was against no repellent, not a placebo. The counts were self-reported. And it tested one lemon eucalyptus product against one European tick species, Ixodes ricinus. The authors themselves called for additional studies. It supports the idea that a registered OLE or PMD product can reduce tick attachment in some conditions. It does not tell you that every OLE product covers every tick, and it says nothing about any essential oil.
Ticks also call for layering. CDC notes that permethrin-impregnated clothing repels and kills ticks, chiggers and mosquitoes, and that registered repellents go on skin. We cover that combination, and the US species that matter, in our tick page.
Midges, black flies and the small print of "biting flies"
This is where marketing runs ahead of data. The 2016 biting-midge study put DEET/PMD repellent on mesh cages around light traps, expecting fewer midges. The traps caught three to four times more midges of the commonest group instead. The authors proposed that the midges might be drawn to low concentrations and repelled by high ones, with the trap's light overwhelming the effect, and they warned that their result does not mean the combination fails on a person or animal. The honest summary is that this experiment cannot tell us whether OLE or PMD keeps midges off skin.
For black flies, a 2026 study built a membrane feeding system and tested three commercial products, including a 30% OLE product, on one black fly species. Repellency of the OLE product held steady across 12 hours in that system while the PMD and IR3535 products declined. That is a laboratory design with one species and one lot of each product, so it is a lead, not a recommendation. A 2004 paper's introduction also says Citriodiol has been shown to repel mosquitoes, stable flies and midges, but that is a background statement and we did not open the underlying reports, so we do not rely on it.
Why label claims vary, and what we would do about it
EPA's repellency awareness graphic is voluntary. When a manufacturer uses it, it shows which pest is covered (mosquitoes, ticks, or both) and the typical protection time. EPA's repellent search tool filters on exactly the same two pests. Our reading of that design is that claims about other insects, such as gnats or midges, sit in the manufacturer's label text and are not summarized by EPA's own graphic. That is an inference, not an EPA statement, but it is why we would not buy a product for a pest the label does not name.
Here is the order we would follow, from diagnosis to decision:
- Name the pest. A mosquito problem at dusk and a tick problem in leaf litter call for different layers.
- Read the label for that pest. If it names mosquitoes only, consider the tick question open. Our walk-through of how to read an insect repellent label shows where the claim sits.
- Check the registration number in EPA's search tool before you rely on any claim.
- If the label is silent, plan for another layer such as clothing, timing or a physical barrier, not more product.
Garden gnats and midges deserve special mention. They are the pest people most often ask about, and they are the one we could verify least. If gnats are the issue, our page on bug protection for gardening separates gnats from mosquitoes and focuses on what the label can and cannot back up.
Frequently asked questions
Does lemon eucalyptus repel gnats?
We found no EPA-evaluated claim and no study we could open that shows it. If a product's label names gnats, that claim comes from the manufacturer's label text. Without that line, do not assume.
Does it repel no-see-ums?
The one experiment we found on DEET/PMD-treated mesh and biting midges had a confusing result, and its authors cautioned against reading it as failure or success. Consider no-see-um protection unproven for OLE and PMD until a label or a stronger study says otherwise.
Does the lemon eucalyptus essential oil repel the same bugs?
No claim can be made for it. CDC says the effectiveness of non-registered repellents, including some natural ones, is unknown, and our own stance page says our oil is not a registered repellent. For the myths that surround it, read what this oil is and what it is not.
Why do you not just tell people what to spray?
Because we do not sell a repellent, and because the right product depends on the pest, the place and the person. Registered products carry label directions and age limits that a general article cannot replace, including CDC's instruction not to use OLE or PMD products on children under 3.
What our oil is for
If you are here for the scent of the tree, our lemon eucalyptus essential oil is a bright, lemony, green top note sold for fragrance and craft use. It is not a bug product, and this page is why we say so.
Last reviewed: October 2026
Lemon Eucalyptus Essential Oil
Lemon Eucalyptus Essential Oil from our own shop, in sizes from 0.5 oz to bulk.
From $9.99
Shop Now →Sources & Further Reading
- CDC Travelers' Health: Avoid Bug Bites
- CDC Yellow Book: Mosquitoes, Ticks, and Other Arthropods
- EPA: Find the Repellent that is Right for You
- EPA: Repellency Awareness Graphic
- Carroll SP, Loye J. PMD, a registered botanical mosquito repellent with deet-like efficacy. J Am Mosq Control Assoc, 2006
- Gardulf A, Wohlfart I, Gustafson R. A prospective cross-over field trial shows protection of lemon eucalyptus extract against tick bites. J Med Entomol, 2004
- Murchie AK et al. DEET/PMD repellent-treated mesh increases Culicoides catches in light traps. Parasitol Res, 2016
- Kerr SM, Gray EW, Batzer DP. A water-jacketed membrane feeder repellent testing system for black flies., 2026