What is that whitish chalky looking stuff that gets on some hoya leaves especially H. finlaysonii? I have it a few others too. It must be some kind of fungus. You can scrap it off with a fingernail. I will try to get a picture tomorrow. If it is a fungus, is Tinactin the stuff of choice to use on that?
Marcy
Some kind of fungus??
Marcy, Tinactin is supposed to work very well, although it leaves a powdery residue on the plant until washed off, and of course smells like Tinactin. Another good one is Neem. See the post on natural mealy, gnat, aphid and whitefly control started by Awanda.
Well, guess what I found at the grocery store? Tinactin fungus spray now comes in a liquid form besides the powder. I got some & sprayed on the troubsome leaves,and it makes them look like Mark said the neem oil stuff does. They are rather shinny and pretty looking now. Ha. No odor either that I can tell. Of course they are outside so it doesn't matter anyway.
Now how often do I put that stuff on? Will the fungused leaves go back to normal or will it just prevent any more from getting like that?
I am not used to dealing with fungus before. Something new to my plants. Drat!
Marcy
OK...finally got around to shooting some pics of this fungus I have. It almost looks like sunburned leaves on some of them, but they have not been in the sun. Also you can scratch it off with a fingernail except that also damages the leaf. I have sprayed all these with Tinactin and also the Rose Defense, but I don't think they will ever look good again. I just don't want it to spread to the good leaves. Anyone know what kind of fungus this is?
Marcy
Another one
A bad one on finlaysonii
This is a potsii with a different kind of virus, fungus, or somehting. I sprayed it too. Could this be caused by this heat wave we are having?
The first photos look like the "result" given by spider mites. I've seen photos like yours showing what the red little develish spider mites can cause. These little devils LOVE dry heat!
Christina
Wow, Marcy, this seems to be a new one to me. The last picture, of pottsii, I would almost say it looks like the purple mottling you get in too much light, that is said to be the visible presence of phosphorous. (not an overdose of phosphorous, just of light).
The earlier pictures, did you say you could scrape the stuff off? Are the dead looking patches what is left underneath afterwards?
How about a real tight close-up of a patch before it is scraped, that might help someone ID it.
No Mark...that whitish chalky looking stuff is what is on the leaf before I try to scrape it off. It is very hard to scrape off, but I wanted to make sure it was something ON the leaf & not just burn or something. If I scrape my fingernail real hard on it, it comes off. Strange stuff.
I will try to get a better picture later.
Marcy, that whitish chalky stuff on leaves... I get that sometimes too from my foliar spraying of superthrive and eleanors. It usually is in a place where the water drops don't run-off or evaporate very quickly, leaving a buildup of chalky substance after a while. It is less if I am a good girl and foliar spray with plain water every now and again (which is hard for me since I want them to grow grow grow!!!).
Ooooh, I hope the babies are OK otherwise.
Ann
Marcy, a couple of my leaves have the symptoms in photo #1. I always thought it was from to much sun, and the leave trying to just recover or heal itself. It never spread or anything, so I didn't think it was anything to worry about. As for the other photo's I have no idea, but I hope the Tinactin works for you.
It looks like the last photo, the H. pottsii, has had a bug nibble at it and the UV has caused it to get red spots. I remember Ed Gilding suffering thru my list of 'OH, why is t his..." and most of HIS reasons were insects or other natural things. The chalky stuff...no idea.
When we grow our plants outside, I think we are at the mercy of the elements.... Are we too nervous about spots and stuff? I don't know. I do know that I get wierd stuff...and when it gets REALLY wierd..I get it analyzed by the plant doctors....