Bugs, Mildews, Strange Stuff forum: Disease ID?

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plumania
Apr 3, 2013 1:53 PM CST
Name: Alka
South Florida
I have these spots on H. verticillata leaves. They developed this season suddenly after a cold spell and plant it hanging from a tree . I bought the plant last year with some small rust color spots on leaves and the nursery said spots will not be harming the plant. Not sure if they have something to do with current problem. Plant did well last year.
Thumb of 2013-04-03/plumania/29a6f7
Thumb of 2013-04-03/plumania/ad9039
Thumb of 2013-04-03/plumania/17df3e

Can someone help treat this problem. Should I spray or water with a fungicide or just leave it? Is it contagious ?
Thanks.
[Last edited Apr 3, 2013 1:53 PM CST]
Quote | Post #963386 (1)
AlohaHoya
Apr 6, 2013 10:40 AM CST
Name: Carol Noel
Hawaii (near Hilo)
It's all about choices.
I've not seen that before... interesting.

I would cut off all of the infected leaves and burn them (spores can live on for YEARS) and then spray with a fungicide. Does it seem to be something in the interior of the leaf?.....
Leap. The net will appear.
plumania
Apr 6, 2013 1:38 PM CST
Name: Alka
South Florida
It does seem that leaves have some infection, fungal type. Most of the leaves got this problem. Plant has several vines all full of buds and peduncles right now.Should I cut off the whole vine or just the leaves? It is inside the leaves. Not a superficial infection.
Wondering if whole plant is toast. Sad
I really like it's flowers and they smell nice.
I was thinking of giving it a drench of fungicide 'physan' too.
Imagemjsponies
Apr 6, 2013 2:10 PM CST
Name: mj
Deleon Springs, Fl
plumania wrote:. They developed this season suddenly after a cold spell and plant it hanging from a tree .


Wonder if it's cold damage ? I left one out by accident when it went down to 38º. Had damage that looks similar. This plant didn't have any pendicules so I cut it back and it's coming back fine now. Maybe drench with a fungicide, keep separated and see what the new growth looks like before hacking it back.
plumania
Apr 6, 2013 2:40 PM CST
Name: Alka
South Florida
Ok , just drenched it with Physan and took better pics. First one is back side of a leaf and rest are front of various leaves-Thumb of 2013-04-06/plumania/2cac19
Thumb of 2013-04-06/plumania/078719
Thumb of 2013-04-06/plumania/fa78c9
AlohaHoya
Apr 6, 2013 5:26 PM CST
Name: Carol Noel
Hawaii (near Hilo)
It's all about choices.
mj has some good points....it could be frost damage but I have never seen it so can't tell. Can't hurt to isolate it and see how the new growth comes out.

Do the badly affected leaves have any smell?
Leap. The net will appear.
Imageogolland
Apr 6, 2013 5:33 PM CST
Name: Olesya Golland
New Jersey
I would do as Carol says: isolate it, monitor it to see if it's going to get any worst and wait for a new growth. Shrug!
plumania
Apr 6, 2013 8:39 PM CST
Name: Alka
South Florida
No bad smell at all. I will try isolating. Hope that Physan 20 helps but I read later that amount needed for ' treating' is almost double triple. And the small amount used today works for 'prevention' only. Also repeated applications are recommended. Physan is supposed to treat various fungus, virus, bacteria, algae,rot and what not.
So, once it dries up, I will treat it again. Hope my plant gets better.

MJ, it is possible that it happened due to cold , despite the fact that there are 4 other hoyas on the same branch (cagayanensis,polyneura, neoebudica and .nummularoides) that were fine .

Is verticillata too sensitive to cold ?

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