Orchids forum: UGH! Thai Disease: Phyllosticata capitatus, also known as Guignardia

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Name: Melissa
Memphis, TN (Zone 8a)
Enjoys or suffers hot summers Garden Photography Cat Lover Hummingbirder Permaculture Region: Tennessee
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shadytrake
Mar 23, 2015 6:23 PM CST
Grumbling I have some disease in my GH!

crap, crap, crap. Grumbling

Three plants are in the trash already. I will be scrubbing my GH with bleach, sterilizing all of my tools, and repotting every orchid in new mix and sterilized pots/baskets.

So far, I think I have Thai Disease on three - two are in the trash, Cercospora on a few - probably they will go in the trash, and Fusarium Wilt on three - hoping to be able to treat them.

Dammit! I think this came in on a Phal that I bought from a vendor who imports directly from overseas. I was wondering why the leaf started looking weird.

I have to quarantine my new purchases from the Springfield show because I don't want them to get infected.
Name: Roberta
Cherokee Village, Ark (Zone 7a)
Region: Tennessee Orchids Irises
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901Bertwood
Mar 23, 2015 7:21 PM CST
Show pics of diseased areas please. And what did you bring home from Springfield? Enjoyed your show pictures.
Bert
Name: Jim Hawk
Odessa, Florida (Zone 9b)
Charter ATP Member Hibiscus Birds Bromeliad Greenhouse Master Gardener: Florida
Garden Photography Region: United States of America Roses Tropicals Region: Florida Orchids
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hawkarica
Mar 23, 2015 7:26 PM CST
Yes, I'm interested in looking at some pictures of this disease too.

Jim
Name: Melissa
Memphis, TN (Zone 8a)
Enjoys or suffers hot summers Garden Photography Cat Lover Hummingbirder Permaculture Region: Tennessee
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shadytrake
Mar 23, 2015 7:32 PM CST
Here you go. One is a Phal leaf and the other is a Dendrobium leaf.

Thumb of 2015-03-24/shadytrake/412b12 Thumb of 2015-03-24/shadytrake/06f50e

As FYI, both of these leaves were perfect in the fall. Based on my reading, this fungus comes on strong in the winter.
[Last edited by shadytrake - Mar 23, 2015 7:34 PM (+)]
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Name: Jim Hawk
Odessa, Florida (Zone 9b)
Charter ATP Member Hibiscus Birds Bromeliad Greenhouse Master Gardener: Florida
Garden Photography Region: United States of America Roses Tropicals Region: Florida Orchids
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hawkarica
Mar 24, 2015 5:12 PM CST
Good catch on the Guignardia, Melissa. Lesions running parallel to the direction of the veins is a clue as is the ruff feel when you run your finger over it. Funny, today at our orchid club meeting I spotted some on a Vanda that someone had brought in to show. When I discreetly told the alpha male, it was segregated and hauled away. It is evidently a serious problem on Vandas here. It sounds like you are on top of it so I'll just wish you lots of luck.

Jim
Name: Elaine
South Sarasota, Florida (Zone 9b)
The one constant in life is change
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dyzzypyxxy
Mar 24, 2015 6:36 PM CST
Melissa, I recently had something like that going on, and treated the plant immediately with a douse of H2O2 diluted 32:1. Then I posted it here and had it diagnosed, but never got to treat it with the Captan I'd bought for the purpose because the plant is no longer showing any signs of the disease!

Elaine

"Success is stumbling from failure to failure with no loss of enthusiasm." –Winston Churchill
Name: Melissa
Memphis, TN (Zone 8a)
Enjoys or suffers hot summers Garden Photography Cat Lover Hummingbirder Permaculture Region: Tennessee
Dog Lover Bee Lover Greenhouse Orchids Hostas
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shadytrake
Mar 25, 2015 10:59 AM CST
Well, it is a good idea to pull plants down and really inspect them anyway. This is a re-pot year (this weekend as a matter of fact).

I threw out 3 that I was positive that the treatment would be a pain and probably not successful. In my inspection, I found 4 more outbreaks of the soft scale that I thought I had eradicated. I cut off the new growth on 2 of those and dipped them hoping to save them. The rest of the big plant on those went in the trash.

So, the total trash count when all said and done was 10. I threw out 3 that were just not thriving and I was tired of dealing with them. Sighing!

Last night, I dipped 1/3 of the collection and this morning another 1/3. The last 1/3 are the mounted and the upper shelf Dendrobiums. I will probably get to those this evening.

I need a nap. Blinking
Name: Carol
Santa Ana,Ca. (Zone 10b)
Sunset zone 22
Charter ATP Member Hummingbirder Lover of wildlife (Black bear badge) Orchids Region: California Plant Identifier
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ctcarol
Mar 25, 2015 4:25 PM CST
Melissa, could you elaborate on the "dipping" process? Confused
Name: Melissa
Memphis, TN (Zone 8a)
Enjoys or suffers hot summers Garden Photography Cat Lover Hummingbirder Permaculture Region: Tennessee
Dog Lover Bee Lover Greenhouse Orchids Hostas
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shadytrake
Mar 25, 2015 4:48 PM CST
ctcarol said:Melissa, could you elaborate on the "dipping" process? Confused


Well, I don't have any systemic fungicide at the moment (shopping trip this weekend) so I had to go with a topical treatment.

The easiest way to do it with the least amount of waste was to fill up my wheelbarrow with 10 gallons of water with 10 tbsp of Daconil.

Then I soaked each orchid all the way bottom to top (dipped) in the solution. The ones that had evidence that I wanted to keep got to stay in the solution for several minutes.

I did 25 in the first dip and then threw out the water and did a new batch for the next 25. I have a bunch more to do but it is not as bad as I thought. I don't see any evidence on the rare plants (lucky). Thumbs up

Name: Carol
Santa Ana,Ca. (Zone 10b)
Sunset zone 22
Charter ATP Member Hummingbirder Lover of wildlife (Black bear badge) Orchids Region: California Plant Identifier
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ctcarol
Mar 25, 2015 6:33 PM CST
Ah ha! Thank you! Thumbs up

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