I have some leaves on a Mauna Loa Hoya turning yellow and dying from the bottom up, leaving behind a yellowed stem with no leaves at the bottom. There no bugs or apparent disease. Iāve checked for root rot. I keep it in bright indirect light at about 50% humidity and itās done great until a few months ago when it started doing this. Should I air layer it and cut it off? How far up the stem should I go to put the root ball if I do that? Help!

