Fungus Gnats

Hi folks,

I I'm at the tail end of a windowsill grow, my first proper attempt at growing me own, its been going pretty well, only one problem, an ongoing battle with fungus mites.

After following some advice, I thought I'd sorted it out, by covering the top of the pots with about an inch and a half of perlite. This seemed to work for about a week or two, however a few other problems have since cropped up, namely wierd spots on several plants, and one in particular developing major curling on the edges of the leaves and droppyness (which only occurs at night, by morning they're mostly back to normal again (even before the suns touched them).


I've posted some photos, what do people think, could this be the effect of those little buggers on its roots? I've laid off the bites thinking that might be the problem, but another guess might be that its overwatering.

To make matters worse I got home this evening to find a different plant crawling with gnats again, they seemed to be burrowing in the perlite. Have they found a way through the barrier, are they the nxt gen from the last lot of eggs or is the perlite simply inneffective?
P
Not sure if it'll work, but I've put a bowl of vineger down to drown em, any other suggestions? I don't really wanna poison them, what with it being so late in the grow (hoping to crop in about 2 to 3 weeks). But if there's no other way and it'll save the plant I'll do what I gotta!

Any thoughts warmly recieved, D

No you shouldnt have done that with a bowl of vinegar, your ph is out now ,better test it. Get the sticky strips and cut pieces off and place onto soil and replace when full. I recently had same prob and this got rid of 90% of them. Also look a bit overwatered. They have longer than 2-3 weeks bro ,try 6-8.

let it dry out throughly. ive heard of people putting sand on top of the soil to stop them but some say neem works better. i had some and managed it by drying and using an organic pestacide with Spinosad. good circulation and fresh air is helpful. i moved my plant outside and no more gnats.

so dry + Spinosad + circulation

they r pretty difficult to eliminate.

Break up some mosquito dunk and sprinkle it over your soil (no worries here, it does not affect your plants). Take the rest of the dunk and mix it with your feed water. The gnats will be gone
I used to have terrible problems with gnats, a guy told me to put a dunk into a nylon sock and keep it in my res the entire grow, never had a problem again
BTW, Mosquito Dunks are a form of Bacillus thuringiensis v. israelensis in a solid form.

Check this site for more info:
http://www.ghorganics.com/MosquitoDunks.html

Kind