In my experience, scale insects often target rugosas like your Hansa. As york rose's link says, horticultural oils smother them, so you wouldn't need to use anything toxic -- Volk oil worked for me.

I'm glad to hear that the LED lights are working for you. It sounds like you have a much bigger space than we do, with only 2 more lights. I think this was perhaps our biggest mistake -- just too many of these lights. (As I mentioned, I was worried that LEDs wouldn't put out enough light). Maybe if we had only installed 4 of them, the amount of light would be ok. To reduce the number to 4 at this point would require completely re-placing the lights and rewiring. I wonder also if the increased number of lights in our smaller space is amplifying the effect of the flickering? i.e. maybe it wouldn't be noticeable if the lights were further apart? The housing and dimmer switch we have are both on the compatible list on the Cree website. All 7 of the lights are connected to the same dimmer switch. So I'm not sure what the problem is. When they are on at full power, they don't buzz or flicker. We had friends over yesterday and at full power they thought the lights looked great. (It wasn't too bright for them). Then I dimmed them and they didn't think the buzzing was too bad. They also didn't really notice much flickering. But then I started waving my arms around and they were shocked. The strobe effect when the lights were dimmed made my kitchen seem like a disco! Cbjmidwood, when you dim your lights and wave your arms around, is there any strobing?

Is there any way you can post a photo or photos of the plant? Passionfruit are normally pretty crazy growers. From what I have read (and limited experience this last year) they can normally take a bit of pruning.

Marble etches and stains. Be VERY aware of what you EXPECT from marble versus what you GET with marble. If you don't care about a metal leg leaving a rust spot behind (that usually enrages MOST homeowners...BTW) then get marble. If you don't mind 'water spots' being left behind every time someone jumps into the pool, then go for it. If you don't mind a glaring white blast of light every time the sun hits it (and it looks like sunlight is going to hit this often) then go for it. If you don't mind potted plants leaving behind dirt and rust stains, then go for it. If any/all of that is going to bug you (Homeowner, Know Thyself) then DON'T USE marble. The local shop has OODLES of marble and they are hoping to shift all that product in one fell swoop. I prefer a 'travertine look' or tumbled limestone-look porcelain tile in your situation. Lisa Caudill Designs has a brilliant option. That would look STUNNING...and be far more 'livable' than marble.