Hoya Gold Star - yellowing leaves, about to excise parts!
Hi all :)
I live in Brisbane, Australia which has a subtropical climate - most like Miami or LA - I leave most of my hoyas and orchids outside most of the year unless we have (very rarely) frosts - some of the local hoyas handle it very well though so I dont bother.
I have a Hoya Gold Star, which has been growing very well and very fast for approximately 15 months - Over the past 3 months, I noticed that it stopped growth, dropped leaves and the last stem from the node started to wilt and yellow - so i cut it. The plant seemed fine and not much happened for a month until I noticed random leaves developing yellow spots.
Spots would develop on both lower and younger leaves - I thought it may be lack of nutrients so gave it a liberal shot of worm juice - nothing.
I then thought it may be waterlogged and rotting, so repotted it into some new loose orchid/sand/potting mix. Cut back on the water (which I was loathe to do as it was still quite warm at the time) - still nothing.
It is now yellowed and spotted all over, has been dropping leaves and looks to be getting ready to yellowing/excising stems from the nodes.
I have attached pictures:
This is what it looks like on the stems where it is about to excise
I was worried it could be tomato spotted wilt virus - which is endemic to the area and has described symptoms - however the rest of my hoyas, and my tomatoes are perfectly fine.
I have taken cuttings of the vines and nodes which looked like they were about to excise and put them in a mix of light potting mix, perlite and orchid bark for drainage. I have left the base of the plant in its pot - It is winter now so I am not expecting too much :(
Any ideas what could be causing this??