"What's your humidity at? Also you could try going an extra day on average between waterings and let the pot really dry out. They like humidity they thrive in it. They also dont like insane warm temps. You could let the pots dry out and cut the ventilation off to temporarily raise temps up to 100 or so haha"
Lol! We are having a summer rainfall event here. Something like 4 times our January average but over 2 days. This morning humidity in my tent 71% and temp 31 degrees C. We occasionally get a big hit of tropical air like this after a cyclone in the NW. Actually, as a short term thing is a nice change from hot sunny and clear.
Normal in my tent has been mid 40%'s and 31-35 degrees C. Plants all happy with that.
On gnats and Neem. Yup, neem is something that is more an underlying. setting of conditions control i think. Actually, my interest in it is more from a fungus control perspective. Bugs i can handle, but my GH experience tells me that fungus can be a worse prob in terms of effect and control.
Nice open canopy and air flow are the keys to not getting fungus in the first place. Some level of defoliation ties into that and removing any lower leaves that even start to look like they have lesions / spots...without going crazy.
For gnats, in the GH we use Vectobac. Its a B.thurengiensis prep we apply off label as a soil drench. Kills the grubs that if they accumulate in numbers eat the fine roots. Very safe from a human health perspective as it relies on the grubs having an alkaline gut and ingesting the prep as they move through the soil. No phytotoxicity even on little delicate stuff like Arabidopsis. Takes a few applications (1 x week) to get things under control but useful.
Yellow stick traps are great. Get the breeders as soon as they can fly is a viable control method, particularly if you cant spray for some reason (close to end of flower?). Wont eradicate but can help control. Also, whats said upthread about temp and going high, briefly, and having the top layers of the soil dryish can be useful if your plants can handle it.
Yellow traps good for gnats, blue is for thrips. I REALLY hate thrips. Seriously, i loath them. Western Flower Thrip is a real prob here in glasshouses.
Much worse than spider mite for persistence and resistance. We have "heat soaked" gh rooms to 50 degrees C after removing all plants to try and get rid of these and still had them recur. Hate them hate them hate them...the bring out my inner Gollum. You get them, nuke them from orbit....its the only way to be sure.
