Monica Katie—February 20, 2026✓ Verified purchase
I’ve been using Mosquito Bits for several seasons now, and they have become a permanent part of my indoor seed-starting routine. If you struggle with fungus gnats when starting plants from seed, this is a highly effective solution. One bag goes a long way; I’ve found that a single purchase lasts me for several years. My preferred method is making a "tea"—I soak the bits in the water I use for my seedlings to ensure the BTi (the active ingredient) is distributed throughout the soil. It works incredibly well at keeping gnat larvae at bay during those early, sensitive stages of growth. I’ve noticed that fungus gnat issues typically peak when I begin moving my seedlings outdoors to "harden off." To combat this, I start adding a few dry bits directly to the top of the soil. This provides continuous control with every subsequent watering, which has made a noticeable difference in preventing a full-blown infestation during the transition. For the price, the value is unbeatable. Since you only need a small amount at a time, it’s an affordable and reliable way to protect your garden year after year. Read more
MewMew11—October 11, 2022✓ Verified purchase
This does work very well for fungus gnats, but I believe this may work best when used with a combination of products. First of all, I can not guarantee elimination if you use these alone for the gnats (maybe it does work alone, but I tried this as a last resort) as I used a combination of the following: First of all, for gnats I HIGHLY recommend using a “top dressing” that will cover the soil completely. I used a combo of sand and small quartzite gravel/volcanic rock (for anything edible I don’t suggest using sand - only use sand for ornamental plants and sand that is silica free/“play sand”). Make sure the dressing is at least 1 inch thick on top, but if possible the thicker the dressing the better. This will eliminate the majority of the gnats alone! I thought I eliminated all of them with only the top dressing and those yellow sticky traps, but I noticed a few stragglers so I added this to the repertoire. I was a bit hesitant to use this at first because of the warning label (it’s required by law!), but based on my research I felt comfortable using it. The main ingredient, “BTI”, stands for bacillus thuringiensis israelensis, which is a type of bacteria that is naturally occurring. The studies I’ve read have shown no serious health consequences for humans or animals (in some rare cases there was irritation to the skin/eyes but no long term serious health consequences). I would never use any product that puts my health at risk (and most importantly the health of my animals!), but if you’re still worried do your own research! To be extra (paranoid) safe I water my plants away from my animals and wash my hands thoroughly after use. Make sure you measure the amount correctly!!! This is vital. Also, when making a “tea” for gnat elimination, the suggested brewing period I find is too short. What I do is make a mix in my watering jug and let it sit for at least 12 hours. Then I stir it very well and apply. I have used it 4 times and the gnats are no more. I’m going to continue applying a few more times to be sure. I am hoping this will work for thrips as well (from what I have read it does). If this works for thrips I will update my review (Trust me when I say the gnats were an easy enemy compared to thrips, ha! Count your blessings if you’re only battling gnats!). THRIPS UPDATE - I do believe this works on thrips as well, but I’m not 100% sure yet. I have one pot that I should have changed out the dirt to help eliminate them, but honestly because the size of the plant it would be a headache, so I decided to leave it as is and do the following: First I added a top dressing of sand and rocks, then everyday for a few minutes I would do a quick examination of the plant and smash any thrips I found, I removed very sickly/damaged foliage, I also added sticky traps to get the ones I missed, then I applied the mosquito bits “tea” once per week (apply to your normal watering schedule if it isn’t the same as mine). I did this for 4 weeks and I have yet to find any more thrips; My sickly plant looks completely healthy now (I believe it’s been about 3-4 months since I completed treatment)! I am being cautiously optimistic about this though because their eggs might be dormant, but I will provide a final update once I believe I have won this battle (or not lol). FINAL UPDATE - So shortly after my last update my mom brought a plant home…. That was infested with thrips. Ah…ha ha ha ha…. *screaming at the top of my lungs* THANKS MOM! Thankfully they didn’t spread much. I restarted my battle as per above. It has been a year since my battle first started with thrips and they are NO MORE. I’m CONVINCED enough. How you wonder? Because I reused the SAME dirt that definitely had their larvae in it for several new plants (I know, I’m COMPLETELY mental haha) and there has been ZERO thrip activity whatsoever (the dirt was infested from a year ago). I’m totally convinced this also works on thrip larvae as I read in previous studies. Just follow my directions on thrips above. Was the battle worth it though? Probably not, to be honest. I would have been way less stressed if I just tossed the plant out and started over, but I hate giving up. If you have time on your hands, or are as nuts as I am, go ahead and become a plant saving warrior! Read more
Lauren Wentworth—March 8, 2026✓ Verified purchase
Pretty effective with mosquitos but doesn’t last very long. Read more
dane spain—March 8, 2026✓ Verified purchase
A little bit goes long way, easy to prevent Mosquito Larvae from becoming a mosquito problem. Also very effective for Gnats! A teaspoon in drains, standing water let soak 30 minutes then use that water for your plants, take care of gnats and others in the soil. Safe for most animals and Humans when used correctly. Save money and spare chemical sprays. Read more
LTB123—February 26, 2026✓ Verified purchase
I brought in an open bag of potting soil at the end of the summer and, unfortunately, fungus gnats had laid egg. When I did some transplanting this past autumn, all the newly planted pots were terribly infested. I tried a "safe" spray" (active ingredient clove oil) but this did nothing. I then got this stuff and it works! Now don't expect it to work overnight, as it only kills the earliest stages of the gnat's life cycle - but a combo of this stuff and yellow sticky traps to get the adults means that you get them at both ends of the life cycle. I went from soooo many gnats to almost none, after a couple of weeks. I am so relieved to get rid of these annoying, somewhat disgusting, and unwanted pests! Read more
Jill Perkins—February 2, 2026✓ Verified purchase
These fixed my fungal gnats problem. I did end up having to individually soak my plants from the bottom up. What I did was fill my sink with water, add a few drops of dechlorinator but that's optional I just dechlorinate any water that goes on my plants (you should try it!) and then dump a whole bunch of these in, I add a half cup of hydrogen peroxide as well to this mix and let it sit overnight. The next day I set my plants in this mixture allowing them each to sit for 15 minutes and then drained them on a rack. This killed the larvae. I had to repeat it 1x but after that my issues were solved. It's a great product and safe for my dog and guinea pig to be around. Read more
K&S-C—February 26, 2026✓ Verified purchase
I used this as directed once a week for 2 months and still have an infestation of fungus gnats. I have recently added neem oil with hopes that will do the job. So not sure this is worth it by itself. Read more