Orchids forum: Yellow leaves, black mid ribs??

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Name: Elaine
South Sarasota, Florida (Zone 9b)
The one constant in life is change
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dyzzypyxxy
Mar 7, 2015 12:53 PM CST
One of my most prized plants, B. nodosa Big Jim has been losing leaves right and left this week. They start with a dark stripe up the mid-rib and then the leaves turn yellow and drop. Sometimes the dark color suffuses out to brown blotches.

This is a big, very vigorous plant that has devoured its second slat basket in 3 years. A huge mass of roots in the middle there to harbor all sorts of evils . .

Could this be the Erwinara bacterial infection? I already did the H2O2 douse on it for that, figured it couldn't hurt. Anyone else got an idea?

Thumb of 2015-03-07/dyzzypyxxy/a56a5d Thumb of 2015-03-07/dyzzypyxxy/5bedba Thumb of 2015-03-07/dyzzypyxxy/ea3502

Elaine

"Success is stumbling from failure to failure with no loss of enthusiasm." –Winston Churchill
Name: Ken Ramsey
Starkville, MS (Zone 8a)
[url=www.tropicalplantsandmore.com]
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drdawg
Mar 7, 2015 1:00 PM CST
I hope someone will know what's going on, Elaine. I would love to know myself just for reference.
drdawg (Ken Ramsey) - Tropical Plants & More
[url=www.tropicalplantsandmore.com]www.tropicalplantsandmore.com[/url]
If God wanted me to touch my toes, he would have put them on my knees.
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 7, 2015 2:34 PM CST
I'm just back from the orchid show and am trying to sort through purchases and pictures but thought this more important. Elaine, at first glance, this looks more like Guignardia Leaf Spot than Erwinia or Pythium. The lesions running parallel to the vains is a big clue. You can fight this with Captan or Mancozeb.

Jim
[Last edited by hawkarica - Mar 9, 2015 3:12 PM (+)]
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Name: Elaine
South Sarasota, Florida (Zone 9b)
The one constant in life is change
Cat Lover Master Gardener: Florida Tropicals Multi-Region Gardener Vegetable Grower Region: Florida
Herbs Orchids Birds Garden Ideas: Level 2 Garden Sages Celebrating Gardening: 2015
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dyzzypyxxy
Mar 7, 2015 3:07 PM CST
Thanks so much, Jim. Can't wait to see your goodies from the show!

I had to make a Lowe's run this afternoon anyway, so I'm glad I waited and will pick up some Captan or Mancozeb while there. (ick, but necessary, I don't want to lose this one)
Elaine

"Success is stumbling from failure to failure with no loss of enthusiasm." –Winston Churchill
Name: Ken Ramsey
Starkville, MS (Zone 8a)
[url=www.tropicalplantsandmore.com]
Orchids Greenhouse Vegetable Grower Ferns Region: United States of America Hummingbirder
Composter Bromeliad Master Gardener: Mississippi Cat Lover Tropicals Plumerias
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drdawg
Mar 7, 2015 4:19 PM CST
Thanks from me too, Jim. I am going to copy those pictures and have the Guignardia Leaf Spot label and treatment on them for future reference.

Done! I tip my hat to you. Hurray!
drdawg (Ken Ramsey) - Tropical Plants & More
[url=www.tropicalplantsandmore.com]www.tropicalplantsandmore.com[/url]
If God wanted me to touch my toes, he would have put them on my knees.
Name: Elaine
South Sarasota, Florida (Zone 9b)
The one constant in life is change
Cat Lover Master Gardener: Florida Tropicals Multi-Region Gardener Vegetable Grower Region: Florida
Herbs Orchids Birds Garden Ideas: Level 2 Garden Sages Celebrating Gardening: 2015
Image
dyzzypyxxy
Mar 20, 2015 10:49 AM CST
Update on Big Jim: thankfully the peroxide douse I did when I first discovered this blight seems to have stopped it! I went and bought some Captan, but didn't get a chance to treat the plant with it before I got wrapped up in the regatta. When I finally got to have a day off yesterday, the plant had a few more dead leaves but nothing new showing up, so that is a big relief.

Will keep an eye on it and treat with Captan if the symptoms re-appear, for sure. Maybe it was just the "threat" that did it? Big Grin
Elaine

"Success is stumbling from failure to failure with no loss of enthusiasm." –Winston Churchill
Name: Ursula
Fair Lawn NJ, zone 6b
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Ursula
Mar 20, 2015 5:06 PM CST

Moderator

Sounds good! I for one would sure miss your nice plant.
Name: Elaine
South Sarasota, Florida (Zone 9b)
The one constant in life is change
Cat Lover Master Gardener: Florida Tropicals Multi-Region Gardener Vegetable Grower Region: Florida
Herbs Orchids Birds Garden Ideas: Level 2 Garden Sages Celebrating Gardening: 2015
Image
dyzzypyxxy
Mar 20, 2015 8:11 PM CST
Yes, and I've been promising a division to 'our' Jim for a while now, so must keep it alive at least until it can donate a limb or two.
Elaine

"Success is stumbling from failure to failure with no loss of enthusiasm." –Winston Churchill
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 21, 2015 7:27 PM CST
That's right, I have personal interest in this plant. nodding

Jim

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