• Ali Bongo, Head Shop UK, buy best bong UK, Percys Grow Room
Clear all

Fungus Gnats :>

4 Posts
3 Users
Posts: 69
Forum Member
Topic starter
Joined: 3 years ago

Hi guys, here we go again - another day another problem.

So i have fungus gnats, i killed around 10 of them in last 2 days. Tomorrow i'm going to get some yellow sticky traps i increased air flow at bottom pots what else could be done ?

Plants are flowering, its day 33 i have fabric pots, its very hot and high humidity. I think i was watering coco to often - once per day and bottom was always almost wet but they are not standing in water at all. 


Please guys help again.. and if someone can explain to me what i did wrong  Crying  

3 Replies
Patreon Bling
Active Grow Diary Bling
5 Complete Grow Diaries
The High Council Award
Instagram Rep
Admin Bling
Discord Member
1 Plant of the Month Win
2 Plant of the Month Wins
3 Plant of the Month Wins
Member for 3 Years
100k Likes Bling
7.5k Posts Bling
Posts: 8554
Admin VIP
Joined: 4 years ago

I replied to your DM but I’ll share the same here for others to see. 

First of all DON’T PANIC lol. I say that because most new growers think this is the worst, but if you have to get one pest, gnats are the easy one. Mostly they bother you far more than the plant but in severe cases they can slow down the growth, be a horrible mess and I’ve heard in extreme cases could kill a seedling. A biological control is available and I use it with 100% effectiveness.

80DE83B6 86AA 4F59 8E8D 162130160D1D

These mosquito dunks have a biological toxin harvested from bacillus thuringiensis israelensis bacteria. This naturally occurring material is toxic to the larvae stage of fungus gnats and mosquitoes but not to other plants or animals. This is a targeted approach aimed at one specific pest. I float the “dunk” in my water for a day or more before I water the plants. The donut is transferred from one bucket to the next one and last me the entire grow. The larvae ingest the toxin and it paralyzes the digestive system and so it can’t feed and it will die. No babies, no new adults.

Second option is to put a small fan blowing directly on the surface of the media. As simple as this sounds it works! I use small computer fans for this as I don’t want too much air moving down there which can dry the leaves out and cause other problems. Gnats are poor fliers and the wind is a deterrent to their flight. The air also helps dry the top layer of the media faster and that helps control the larvae that live in the soil. Keeping a dry layer on top the soil helps avoid gnats, they don’t like dry, but avoid starving the plants of moisture and remember that coco works best if it stays wet so watering a minimum of once daily with runoff is recommended. Whatever your course of action the plants health should always be a priority.

Hope some of this helps

Forum Member
Joined: 3 years ago

Posts: 69


Thank you again Smile

I hope i can buy this in local store before it get worst.. 

Forum Member
Joined: 3 years ago

100 Post Likes
250 Post Likes
500 Post Likes
Posts: 123

@monkeydo might try these too


Our forum is free to join. We are an international cannabis forum that helps people all over the world grow their own personal supply of cannabis. Through our site you will find cannabis breeding forumscannabis deficiency forumsindoor cannabis growing forums, and much more. 

We are a home growers cannabis forum, and we only allow people who grow cannabis for personal use to be members. Our mission is to help you grow your own cannabis. We do not buy/sell/trade cannabis, or equipment for growing cannabis. Our site is strictly a cannabis smokers forumcannabis growers forum and forum for medical cannabis users.

Use our guides on how to grow cannabiscannabis grow diaries, and growers forum to find all the info you need to learn how to grow your own cannabis.

Any member who is suspected of growing cannabis for commercial gains will be banned immediately.

Please read our forum rules, and enjoy the site.

Find us on all social networks! Just search for Percys Grow Room