Tag Archives: experiment

Spartan Mosquito Eradicator updates

Below are some developments relating to Spartan Mosquito’s attractive toxic sugar bait called the “Eradicator”. It’s a tube filled with water, sucrose, sodium chloride, and yeast.

Cease-and-desist order

I was curious whether the Mississippi Attorney General’s office had ever taken legal action against Spartan Mosquito (a Mississippi company), so I submitted a freedom-of-information request and was sent a letter, below, that directed the company to remove all mention of the Mississippi Department of Health from an advertisement.

Letter from Mississippi's Attorney to General to Jeremy Hirsch, founder of Spartan Mosquito

The Attorney General’s office sent the offending ad, too (below), which purported to summarize an experimental test of the Spartan Mosquito Eradicator. The ad asserts that the Mississippi Department of Health’s entomologist was involved and that the Department approved the results — both were false statements. Spartan Mosquito further emphasized a (non-existent) government collaboration by naming the case study “CSL4GOV-ZIKA”.

Spartan Mosquito's Zika brochure

Zika health claim

As an aside, the Department of Health’s entomologist was indeed at the site, but she was there to coordinate the massive spraying program that the Department of Health was using to minimize the potential mosquito-borne spread of Zika virus around the house of somebody who had the disease. Therefore, the reason there were no mosquitoes in the area is not because there were Spartan Mosquito Eradicators hanging from trees but because the mosquitoes were all killed by months of insecticide treatments. Spartan Mosquito knew the area was being sprayed with insecticide, too, but ignored that detail when it concluded that the presence of the Spartan Mosquito Eradicators resulted in “the most effective, longest-lasting Zika-control response on record anywhere”. Making a health claim violates both EPA and state rules.

Spartan Mosquito repeated the claim in a Facebook ad:

Spartan Mosquito's Zika advertisement on Facebook

… and in a television segment (jump to the 40-second mark):

Efficacy claims from boric acid formulation

It’s important to note that at the time of the Zika “case study”, the tubes appear to contain boric acid, not table salt. I determined that by freezing the above television clip (@ 1 min 9 secs) and looking at the ingredient list at the bottom of the label.

Spartan Mosquito Eradicator tubes showing boric acid as ingredient

Spartan Mosquito even gave one of its tubes to the Mississippi Department of Health’s entomologist, who took a photograph (below). This photograph confirms that the tubes used at the Lamar County site contained boric acid.

Spartan Mosquito Eradicator tube showing boric acid as ingredient

This means that the efficacy claims (“kills up to 95% of mosquitoes for 90 days”) on current boxes of Spartan Mosquito Eradicators are based on a version of the product with a different formulation. And, by extension, the graph is based on the boric-acid case study, too:

Spartan Mosquito Eradicator efficacy graph

Sale of unregistered, boric-acid version?

There’s another consequence of using boric acid (a Federally-regulated pesticide) in early versions of the Spartan Mosquito Eradicator — it means that the company was required to get an EPA registration to legally sell the device in the United States. It didn’t have one. I’m not sure exactly which states the Spartan Mosquito Eradicator was shipped to during this time. Or maybe it was just in-store sales in Mississippi.

States banning the Eradicator

You’d think given all of the above that the device would have been banned long ago, but most states allow the Spartan Mosquito Eradicator to be sold without restriction and with no alterations of its original packaging and claims. And retailers in these states can repeat and amplify those claims (“get your yard mosquito free”) to generate sales.

Sales of the Spartan Mosquito Eradicator have been blocked only in California, Connecticut, Indiana, Kansas, Maine, Montana, New Mexico, Pennsylvania, South Dakota, Utah, Washington, D.C., and Puerto Rico. States don’t announce why, usually, but one cited false and misleading claims, lack of acceptable efficacy data, and presence of numerous health claims on the company’s website (here are archived snapshots) and its Facebook page (company is in the process of hiding the claims).

Audit of 25(b)-exempt pesticides

A recent initiative by the Association of American Pesticide Control Officials (AAPCO) is likely generating fresh scrutiny of the Spartan Mosquito Eradicator. Per the group’s website, state regulators in Arizona, Indiana, Maine, Mississippi, South Dakota, Washington DC, and Wisconsin have all volunteered to make a list of “minimum risk” pesticides on the market in their respective areas and then evaluate how the products were vetted. The end goal of this exercise is to help all states standardize how such products are approved. The emphasis will be on efficacy data, and AAPCO has 2-pages of guidance on the topic, all of it very sensible. Here’s a sampling of what the group recommends:

  • Application should include a complete description of the materials and methods, statistical results, and conclusions.
  • “Data must be credible, independently collected, reproducible, and replicated.”
  • “Data should include a minimum of three (3) replicates per test.”
  • “Data should be generated with the product (formulation) submitted for registration.”
  • “Data should include an untreated control.”
  • Study director should have actual experience in designing and conducting experiments.

In regards to the latter requirement, to my knowledge Jeremy Hirsch did not have any experience in conducting mosquito trials. At the time of the study he owned a sandwich shop franchise:

In addition to standardizing the data requirements, participating states will also collect and study products labels. The part of the label that might be discussed for the Spartan Mosquito Eradicator is the name of the product itself. In AAPCO’s guidance, misleading brand names is a concern:

Screen shot of AAPCO rule on misleading brand names

Because “eradicate” means to eliminate entirely, state regulators might reasonably view “Eradicator” as misleading. Indeed, the EPA specifically identified “Eradicator” as a misleading brand name in 2002, years before the Spartan Mosquito Eradicator came to market.

What’s especially interesting about the audit is that Mississippi, Spartan Mosquito’s home state, is participating. And, according to the Mississippi Bureau of Plant Industry, Spartan Mosquito never submitted efficacy data even though doing so is a requirement (screenshot of its rules is below).

Mississippi's efficacy requirement for 25(b) pesticides

In contrast, some of participating states have seen the efficacy data and have banned sales of the device. I think the audit process (which involves numerous rounds of reports and meetings) could easily trigger stop-sale orders in those states that haven’t yet appreciated the device’s shortcomings. I suspect it might also trigger scrutiny of Spartan Mosquito’s new version, the Pro Tech, which reverts to the original formulation of boric acid.

Spartan Mosquito Pro Tech in a tree

Does the Spartan Mosquito Pro Tech attract mosquitoes?

This post evaluates the claim on the label, “mosquitoes will gather near them”. Per the company, it is the first step in how the device kills mosquitoes. I.e., the device needs to attract mosquitoes if it is going to work.

mosquitoes will gather

Evaluating the claim

I used a security camera to record activity around the cap area. Here’s a photograph of how I arranged everything:

Spartan Mosquito Pro Tech with security camera

Below is a 15-second time-lapse to show that small insects such as ants were easily visible, even at night. I think they are Prenolepis imparis, which are 3-4 mm long —mosquitoes are larger and thus would be detectable even in flight.

On the day that began filming (September 2nd, 2020) I counted over a dozen mosquitoes (all Aedes albopictus) landing on my arms and legs within 30 seconds. According to the instruction sheet, the device begins to work instantly, as soon as water is added, so an hour of remote, video observation should be a sufficient amount of time to evaluate the attraction claim.

Spartan Mosquito Pro Tech begins working instantly

I collected continuous footage for over a week, ending observations on September 10th. The mosquitoes were still plentiful on that day.


During 183 hours of footage, I couldn’t find a single mosquito on or near the device. Here are the contents. I also posted a photograph to iNaturalist.


Because the Spartan Mosquito Pro Tech did not attract any mosquitoes, it therefore did not kill any mosquitoes. If my results are generalizable to other yards, the device is worthless as mechanism of mosquito control.

It is noteworthy, I think, that Spartan Mosquito has not made public a single video of mosquitoes gathering around a Pro Tech (or an Eradicator) when it is deployed outside. My guess is that the company has tried many times to get such footage but has not succeeded in attracting a mosquito. It will be interesting to know whether they will be compelled to disclose their efforts in a court of law. I.e., because the company has formally claimed to the EPA that “mosquitoes will gather” around the Pro Tech, the company would be in substantial legal jeopardy if that statement turned out to be false. If that’s what is going on then it seems likely that the EPA Enforcement Office might coordinate with the FTC as well.


In case anyone might be skeptical of my results, I decided to upload all 183 hours of footage onto YouTube. I had to break it into 16 segments due to size limits on YouTube.

Scientists find that Spartan Mosquito Eradicators don’t work

Research conducted in Florida found no evidence that Spartan Mosquito Eradicatiors are effective mosquito-control devices. Here’s the citation:

Aryaprema, V.S., E. Zeszutko, C. Cunningham, E.I.M. Khater, and R.-D. Xue. 2020. Efficacy of commercial toxic sugar bait station (ATSB) against Aedes albopictus. J. Florida Mosquito Control Association 67: 80-83. PDF

Laboratory experiment

Below is a rough reconstruction of the laboratory experiment they conducted. In each of the cages (BugDorm-2120), 100 male and 100 female tiger mosquitoes (Aedes albopictus) were released, then monitored for mortality at 24, 48, and 72 hours.

Schematic of laboratory experiment based on description in Aryaprema et al. 2020.

Here is a photograph of one of the choice cages:

Below are the cumulative mortality data for the three cages. The Spartan Mosquito Eradicator filled with the provided packet ingredients (treatment) did not result in higher mortality. I.e., there was no evidence the device killed mosquitoes under laboratory conditions.

Field experiment

The researchers also conducted a field experiment using two sites that had large populations of tiger mosquitoes (because of the presence of tires). At each site they deployed five tubes (separated by 4 m), switching whether the tubes were “treatment” or “control” tubes every 2 weeks. A BG-Sentinel trap (without carbon dioxide) was used to quantify mosquito numbers every week.

Schematic of field experiment based on description in Aryaprema et al. 2020.

Below are the weekly numbers of mosquitoes caught in the BG Sentinel traps. Results: there was no evidence that presence of treatment tubes (filled as per company guidelines) reduced the numbers of mosquitoes at the sites.


The scientists concluded that “Both laboratory and field components of our study show that the Spartan Mosquito Eradicator is not effective in reducing abundance of Ae. albopictus.” They speculate that the contents do not attract mosquitoes and that the holes on the device (~3 mm) are too small for mosquitoes to easily reach the fluid inside. They also highlight the need for an experiment to evaluate whether the active ingredient (1% sodium chloride) kills adult mosquitoes. I.e., even if mosquitoes were attracted to Spartan Mosquito Eradicators and could easily get inside, the salt might not be lethal.

Update: the salt experiment has been conducted. And the result is that salt does not kill mosquitoes.