500+ bought since yesterday, try a subscriptionOverall pick
Visit the STEM Store

STEM Kills Indoor & Outdoor Fly, Mosquito & Gnat Insect Killer Bug Spray Value Size, 12 oz

Key item features

  • Natural Ingredients: Essential oil-made bug spray effectively kills flies, mosquitoes, and gnats using plant-based active ingredients.
  • Safe Application: Formulated for safe use around children and pets when applied as directed, ensuring family well-being.
  • Pleasant Scent: Features a fresh scent without added dyes, fragrances, or harsh chemical odors, enhancing user comfort.
  • Expert Tested: Entomologist-tested pesticide for home use, confirming its efficacy against flying insects.
  • Botanical Actives: Developed with geraniol and lemongrass, neurotoxic essential oils that target the nervous system of pests.
  • Versatile Use: Suitable for both indoor and outdoor applications, creating a bug-free environment in various settings.
Generated by AI
Current price is $7.9666.3 ¢/oz
Price when purchased online
  • Free 90-day returns
Subscribe, Your usuals, on your schedule, Save time and stay stocked!, $7.96
Your usuals, on your schedule
Save time and stay stocked!
One-time purchase $7.96

How do you want your item?

Try 30 days for just $1! Choose a plan at checkout.
How do you want your item?
Ships to
Arrives by Tomorrow
Sold and shipped by Walmart.com
Free 90-day returns
This item is gift eligible
walmart plus

Try 30 days of Walmart+ for just $1!

T&C apply.

About this item

Product details

Specifications

Directions

Warranty

Ingredients

Warnings

Refine your search

Customer ratings & reviews

4 out of 5 stars
stars777 ratings253 reviews
How item rating is calculated
5.0
3.8
2.5
2.4
2.3
5.0
  1. 5 stars62% (484)
  2. 4 stars12% (90)
  3. 3 stars8% (61)
  4. 2 stars5% (35)
  5. 1 star14% (107)

Reviews summary

Pros

  • : Safe for use around kids and pets.
  • : Kills mosquitoes and flying insects.
  • : Allows for effortless operation.
  • : Kills on contact and repels fly populations.
  • : Has a subtle, non-overpowering smell.

Cons

  • : Leaves a residue that requires additional cleaning.
Generated by AI

Customer photos

  • +6 images
Filtered and sorted results would be available on the new 'Customer ratings & reviews' page.
Sort by |

Showing 1-3 of 253 reviews

Jun 11, 2025
anonymous
Item details
Scent: Fresh
5 out of 5 stars review

Verified Purchase

Pretty goid

I'm not gonna lie, the reviews kinda gave me a reason to believe this product wouldn't work, but it WORKED, you spray on contact, kills within a couple seconds, only thing is the smell kinda strong bothers me, but I'm not gonna complain cause it did its job also it is oily but it doesn't matter it worked

Helpful?6F3NUFYDNJ42975519275
Nov 8, 2025
Sara
Item details
Scent: Fresh
5 out of 5 stars review

Verified Purchase

LOVE IT

We've had a problem with pantry moths and tried numerous other products that were not effective nor safe. I tried STEM gnat and fly spray and it wiped them out! I sprayed once and resprayed the following day. I waited a week for any other eggs to hatch and sprayed again. Haven't seen them since.

Helpful?6F3NUFYDNJ42975519275
Jul 20, 2025
MyHonestExperience
Top Reviewer
Item details
Scent: Fresh
4 out of 5 stars review

Verified Purchase

Oily, but effective!

First, let me say that I absolutely despise the oily residue left behind by Stem products 😑. DO NOT SPRAY ON ANYTHING YOU VALUE. **This can is very messy as well. It is not like any other spray I've used. Spray will be on your hands and the canister. So, wear gloves** That said, this works for fruit flies. We had a banana blunder and they took over. I thought they were at bay. But, they were just hiding and multiplying 🤢. None of the home remedies were working. The dish soap and water spray was a joke. They gathered on the curtain I sprayed like I'd just ordered a round at a bar. 😭 This arrived yesterday. And already, there is a drastic improvement. Now, in no way has this worked INSTANTLY. The experience I am having is that it will immobilize them. They fall to the ground or slide down the oil slick on the wall. Eventually, the succumb to this concoction. Or you can wipee them up instead of waiting. Some are more stubborn. And those are the ones I'm working on now. But, I recommend this if you find yourself with an infestation. Again, DRASTIC improvement. like 30 to 5 (example). Keep your soapy rag or paper towels handy for immediate oil removal. I have sprayed several times in the two areas I've seen them congregate. And they are disappearing! The scent does not bother me or my child. Some batches of the red label give me a headache. So, that is a plus. Good luck. STEM people, of you read reviews, fox the way this is dispensed. Your products cost too much for the spray mechanisms to dispense the way they do. The product is wasted during each expel. I'm sure this was observed during the testing of this particular product. As it happens EACH time the product is dispensed. Adjustable nozzles, or a more concentrated spray option would be nice. Not every job needs an ounce of spray. 🙂

Helpful?6F3NUFYDNJ42975519275