I brought my rosemary plant indoor from my patio. Just today I noticed a white powdery deposit at the tips of the plant where new growths have sprung where I have pruned off a couple of weeks ago. I did some reading on the internet and there are 2 explanations: Fungus or wax from the plant oozing out. Does anyone out there have the same experience with this? Thanks!
It is more than likely a fungus. Fungus doesn't survive so well with good air circulation so bringing it indoors where it is warmer and less air flow is a good environment for fungi to flourish. Also I am guessing that the soil is too damp. If it is a fungus then you might want to just put it back outside or give up on it. Not too much to fix that.