Sudden fungal/bacterial attack on my Vanda in spike
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  #1  
Old 07-12-2021, 04:15 PM
cuckoo cuckoo is offline
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Sudden fungal/bacterial attack on my Vanda in spike
Default Sudden fungal/bacterial attack on my Vanda in spike

Up until a couple of days ago, my newly acquired (a couple of months) Vanda (Rapeepath yellow) was doing fine and appeared healthy, growing fat new roots (in its new lava rock medium) and steadily developing a spike (after several years gap going by the position of previous spike stubs) and I was pretty pleased with myself It did have tiny black/purple spots, mostly at the leaf edges and then on the spike as it poked out. I have been keeping it in an east facing window and outdoors depending on temperatures and rain (indoors when it gets too cool outside or rains too much). Anyhow, it is now showing big watery orange spots on too many leaves to simply cutoff. Even a fat new roots suddenly became brown and soggy. I have cut off the root as close to the the stalk as I could reach (most of the remaing part was green except a slight portion). The wet spots were oozing yellow liquid on the leaf underside in some places. I wiped off the spots, sprayed hydrogen peroxide on the spots, wiped off and applied/dusted off with cinnamoned powder. I just ordered physan but it will be afew days before I get it. I will add some pics in the next post. Please suggest best option at this time.
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Old 07-12-2021, 04:32 PM
cuckoo cuckoo is offline
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Sudden fungal/bacterial attack on my Vanda in spike
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Pics attached. Is it going to be impossible to control the spread without removing all the infected leaves/parts?
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Sudden fungal/bacterial attack on my Vanda in spike-img_20210712_134759698-jpg   Sudden fungal/bacterial attack on my Vanda in spike-img_20210712_134703388-jpg   Sudden fungal/bacterial attack on my Vanda in spike-img_20210712_134727403-jpg   Sudden fungal/bacterial attack on my Vanda in spike-img_20210712_134734874-jpg   Sudden fungal/bacterial attack on my Vanda in spike-img_20210712_134743587-jpg  

Sudden fungal/bacterial attack on my Vanda in spike-img_20210712_134748530-jpg  
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Old 07-12-2021, 04:50 PM
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Neither the peroxide nor Physan will be of help. Both are topical disinfectants, and that is an internal infection, needing a systemic treatment.

There is no way for me to now for sure, but I suspect that is a bacterial rot. You'd do better with a copper treatment like Phyton 27 or Southern Ag Liquid Copper.
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Old 07-12-2021, 05:15 PM
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Thanks. It does appears to be bacterial infection.
I read somewhere to avois copper treatment for plants in spike/bloom.
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Old 07-12-2021, 05:20 PM
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Sudden fungal/bacterial attack on my Vanda in spike
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uff sry to see cuckoo. I know nothing about bacterial rot but seeing this I feel like I should know more so looking at physan and phyton 27 which I know nothing about it seems physan is to disinfect surfaces and phyton 27 works by killing bacteria inside the plant too, is that roughly right? Sorry for my ignorance but if that were to appear I'd be ill prepared I think.
Is phyton 27 good to use as a preventative solution on new plants or should it only be used on a sick plant?
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Old 07-12-2021, 05:24 PM
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Sudden fungal/bacterial attack on my Vanda in spike Male
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Cuckoo - would you rather lose blossoms or the entire plant?

Shadeflower - I think it’s best to never do preventive treatments.
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Old 07-12-2021, 05:48 PM
cuckoo cuckoo is offline
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Quote:
Originally Posted by Ray View Post
Cuckoo - would you rather lose blossoms or the entire plant?

Shadeflower - I think it’s best to never do preventive treatments.
The answer is obvious. Is the situation so dire? I have the plant sitting in front of me and I am watching it to see how quickly it spreads or not. I have cut some of the spots on the edges but if I cut all infected parts I will be losing probably half of the about 20 leaves in the most asymmetrical/ugly fashion and the plant will probably not look remotely respectable for the next five years or so...
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Old 07-12-2021, 06:31 PM
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Sudden fungal/bacterial attack on my Vanda in spike Male
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You need to figure out why this happened and prevent it from recurring. What are your temperatures day/night? Humidity? Light? Are you growing outside or indoors?
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Old 07-12-2021, 07:02 PM
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Quote:
Originally Posted by estación seca View Post
You need to figure out why this happened and prevent it from recurring. What are your temperatures day/night? Humidity? Light? Are you growing outside or indoors?
I believe it is the incessant rains, high humidity. I don't know how people are able to grow orchids outdoors for part of the year in temperate climates. I tend to lose or have set backs with my orchids when I put them outdoors. A couple of years back I lost two vigorous cattleya seedlins to black rot. Seta backs to phals abound. I lost a dendrobium seedling this year, have yellow spots on one vanda and now this. I am probably not going to give my orchids a summer vacation ever again.
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Old 07-12-2021, 09:18 PM
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Sudden fungal/bacterial attack on my Vanda in spike
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I bit the bullet and cut off majority of infected leaves (half of overall foliage) , a couple with small watery patch bang in the middle of the leaf are left. Ordered liquid copper. Keeping fingers crossed. What a disaster. I doubt that spike will survive such a drastic downsizing of the plant.
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