Which Salvia are you talking about?

divinorum. Diviners sage. I think the fungus gnats killed the bottom as its darker in color, a brownish color, and all the leaves on it are very small and have dark tips.. as if they are under stress, plus there isn't much of them. I'll take a pic of it if my description is not good.

I personally, have never had fungus gnats kill a plant... but fungus does. If there is too much humidity and not enough air circulation, you can get all sort of fungus and molds.

Nope, there is no mold or fungus, there is no humidity as the plant is not in a humidity tent, just in the room w/ about 20-35% humidity. Its ina 10" pot, air circulation is good, and its wick watered from the bottom. There are fungus gnats in the plant cuz I see them fly out of the soil when i touch the soil

In a similar situation, I cut and made cuttings with the top, and hope the base to alive.

s. divinorum is easy to propagate with cuttings.

If the stem is not only dark (nearly black) but shriveled, you may have a vascular attack by botrytis or pythium (blackleg)

I had always that this particular Salvia requires a humid environment, and little direct sunlight?

Robin.

No salvia does not need high humidity althought it does like it, it can get used to many different environements. Right now I am keeping it by the window, since there is hardly any sun yet, it spends its days under a 13W flourescent light which it does good under. It was about 10 cm in January, and now it is about 60cm.. but I'm not sure if making cuttings out of it is a good idea, i'll have to make alot of cuttings.. at least 20 from this plant. I'd rather not do this unless I have to, I wonder if it will worsen, it seems like the first node is pretty much dead.

I have heard that he is right on this salvia, I have heard rumors of it getting large here in Sacramento and we have been known to have lower than %15 humidity. I tried it in a greenhouse a few years back, but the greenhouse was crowded and it was behind a bigger plant and didn't get watered and croaked.... bad salvia mommy.

Yeah so anyone know what this could be? I will have to post a pic soon so you can take a look, but I think its stem rot caused by the fungus gnats, does the fungus gnat spray work? I was wondering cuz its $20 a can.

Well, I've never heard that fungus gnats eat plants... the larvae may damage roots, but the actual gnats wouldn't be causing the problem... truly. Some people feel better when they throw a lot of money at a problem, but I really don't feel that it's fungus gnats

Here is a link that might be useful: fungus gnat

Yes, fungus gnats are a real problem once they get hold of a weak plant. The larva eat all the roots. Really hard to get rid of. I attack the flies with an invisible agent - insecticide vapouriser like those you use at home. This should stop the adults laying eggs. But the real problem is with the larva. They seem to thrive under normal room temperature and very moist soil. Perhaps you could use the insecticide vapouriser (for the flies) together with a systemic insecticide (for the larva)? Hope this helps.