black spots: disease or sunburn?

coast crab · 10-24-2009, 11:23 AM

I noticed this spotting on my glui kai a few days ago. It had been in the shade and I moved it to an open, sunny spot. So is this sunburn, or a disease?

Thanks!

Russell

<a href=http://www.bananas.org/gallery/showphoto.php?photo=25634&ppuser=5745><img src=http://www.bananas.org/gallery/watermark.php?file=25634&size=1 border=0></a>

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coast crab · 10-24-2009, 12:53 PM

Let me try this again....

Nicolas Naranja · 10-24-2009, 03:31 PM

The necrosis on the 10 o'clock leaf looks like sunburn and given your description of the situation that is probably the issue.

sandy0225 · 10-26-2009, 07:41 AM

Has your weather been dramatically cooler lately? Mine do that in the fall in Indiana sometimes after a cooldown in the weather.

coast crab · 10-26-2009, 11:45 AM

Quote:

Originally Posted by sandy0225

Has your weather been dramatically cooler lately? Mine do that in the fall in Indiana sometimes after a cooldown in the weather.

Sandy, you may be on to something. That cold blast everyone was complaining about hit us on 10-16/17. The cold wind was bad and we went from upper 80's to low 40's. Besides the black spots on the glui kai, my siam ruby looks TERRIBLE. I know that it is very sensitive to cold.

When you say "mine do that in the fall..." do you mean glui kai in particular? None of my other new plants in pots look like this, they were all potted then moved out into the sun weeks later (and exposure to cold) at the same time.

Nicolas, you are correct that there is sun damage - brown patches - but I've never seen sun damage show up as black spots.

Russell

john_ny · 10-26-2009, 02:59 PM

I learned, many years ago, what the sun can do. I had some Gros Michel that had been kept in a store. One day I took some to a flea market, that was held on the asphalt parking lot of a shopping center. There was no shade at all. Within a few hours, the leaves turned white. The white areas eventually dried up and turned brown, but I've nerver seen any black marks or specks caused by sun.

Nicolas Naranja · 10-26-2009, 03:16 PM

There are some fungal diseases that do cause black spots maybe Deightoniella torulosa which is called speckle. I'm sure that someone at Auburn Extension would be willing to help you identify it.

sandy0225 · 10-26-2009, 06:34 PM

No I don't have that particular banana but I've seen it on gran nain, margarita, siam ruby, and many others here where nanas aren't too happy in the fall!

1aday · 01-15-2010, 03:00 PM

I moved some small basjoo out into the sun this summer, and they got identical looking small spots. They started to go away once they got back to partial shade.
I'm sure your problem is sunburn.

coast crab · 01-17-2010, 11:39 AM

Thanks everyone.

Thirteen nights in a row of 20 degree weather "cured" the black spots!

Russell

10-24-2009, 11:23 AM	#1 (permalink)
coast crab garden variety plant nerd coast crab's Photo Gallery Location: Lovely Mobile, Alabama - The Heart of Dixie Find me on the map! Zone: 8b Name: Russell Join Date: Jul 2009 Posts: 427 BananaBucks : 49,542 Feedback: 0 / 0% Said "Thanks" 29 Times Was Thanked 409 Times in 178 Posts Said "Welcome to Bananas" 5 Times	black spots: disease or sunburn? I noticed this spotting on my glui kai a few days ago. It had been in the shade and I moved it to an open, sunny spot. So is this sunburn, or a disease? Thanks! Russell <a href=http://www.bananas.org/gallery/showphoto.php?photo=25634&ppuser=5745><img src=http://www.bananas.org/gallery/watermark.php?file=25634&size=1 border=0></a> <a href=http://www.bananas.org/gallery/showphoto.php?photo=25635&ppuser=5745><img src=http://www.bananas.org/gallery/watermark.php?file=25635&size=1 border=0></a> __________________

10-24-2009, 12:53 PM	#2 (permalink)
coast crab garden variety plant nerd coast crab's Photo Gallery Location: Lovely Mobile, Alabama - The Heart of Dixie Find me on the map! Zone: 8b Name: Russell Join Date: Jul 2009 Posts: 427 BananaBucks : 49,542 Feedback: 0 / 0% Said "Thanks" 29 Times Was Thanked 409 Times in 178 Posts Said "Welcome to Bananas" 5 Times	Re: black spots: disease or sunburn? Let me try this again.... __________________

10-24-2009, 03:31 PM	#3 (permalink)
Nicolas Naranja Muck bananas Nicolas Naranja 's Photo Gallery Location: Pahokee, FL Find me on the map! Zone: 10 Name: Nick Join Date: Nov 2008 Posts: 2,135 BananaBucks : 278,376 Feedback: 6 / 100% Said "Thanks" 58 Times Was Thanked 5,143 Times in 1,479 Posts Said "Welcome to Bananas" 7 Times	Re: black spots: disease or sunburn? The necrosis on the 10 o'clock leaf looks like sunburn and given your description of the situation that is probably the issue. __________________ Some people go bananas, I went plantains.

10-26-2009, 07:41 AM	#4 (permalink)
sandy0225 Northern Tropics sandy0225's Photo Gallery Location: Muncie, Indiana zone 5 Find me on the map! Zone: zone 5 Name: Sandy Join Date: Nov 2005 Posts: 1,717 BananaBucks : 244,843 Feedback: 31 / 97% Said "Thanks" 38 Times Was Thanked 1,782 Times in 681 Posts Said "Welcome to Bananas" 9 Times	Re: black spots: disease or sunburn? Has your weather been dramatically cooler lately? Mine do that in the fall in Indiana sometimes after a cooldown in the weather. __________________ Sandy Burrell Northern Tropics Greenhouse 1501 East Fuson Road Muncie, IN 47302 www.northerntropics.com specializing in bananas, heirloom tomatoes and water gardening plants~ check out our new online store at our website!

10-26-2009, 02:59 PM	#6 (permalink)
john_ny Member john_ny's Photo Gallery Location: Staten Island, NY - southernmost county in NY State. Find me on the map! Zone: USDA7- Sunset34 Join Date: Jun 2007 Posts: 2,014 BananaBucks : 428,414 Feedback: 5 / 100% Said "Thanks" 1,057 Times Was Thanked 2,270 Times in 830 Posts Said "Welcome to Bananas" 37 Times	Re: black spots: disease or sunburn? I learned, many years ago, what the sun can do. I had some Gros Michel that had been kept in a store. One day I took some to a flea market, that was held on the asphalt parking lot of a shopping center. There was no shade at all. Within a few hours, the leaves turned white. The white areas eventually dried up and turned brown, but I've nerver seen any black marks or specks caused by sun. __________________ John

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10-26-2009, 03:16 PM	#7 (permalink)
Nicolas Naranja Muck bananas Nicolas Naranja 's Photo Gallery Location: Pahokee, FL Find me on the map! Zone: 10 Name: Nick Join Date: Nov 2008 Posts: 2,135 BananaBucks : 278,376 Feedback: 6 / 100% Said "Thanks" 58 Times Was Thanked 5,143 Times in 1,479 Posts Said "Welcome to Bananas" 7 Times	Re: black spots: disease or sunburn? There are some fungal diseases that do cause black spots maybe Deightoniella torulosa which is called speckle. I'm sure that someone at Auburn Extension would be willing to help you identify it. __________________ Some people go bananas, I went plantains.

10-26-2009, 06:34 PM	#8 (permalink)
sandy0225 Northern Tropics sandy0225's Photo Gallery Location: Muncie, Indiana zone 5 Find me on the map! Zone: zone 5 Name: Sandy Join Date: Nov 2005 Posts: 1,717 BananaBucks : 244,843 Feedback: 31 / 97% Said "Thanks" 38 Times Was Thanked 1,782 Times in 681 Posts Said "Welcome to Bananas" 9 Times	Re: black spots: disease or sunburn? No I don't have that particular banana but I've seen it on gran nain, margarita, siam ruby, and many others here where nanas aren't too happy in the fall! __________________ Sandy Burrell Northern Tropics Greenhouse 1501 East Fuson Road Muncie, IN 47302 www.northerntropics.com specializing in bananas, heirloom tomatoes and water gardening plants~ check out our new online store at our website!

01-15-2010, 03:00 PM	#9 (permalink)
1aday 1aday's Photo Gallery Join Date: Mar 2008 Posts: 224 BananaBucks : 31,175 Feedback: 0 / 0% Said "Thanks" 15 Times Was Thanked 183 Times in 104 Posts Said "Welcome to Bananas" 24 Times	Re: black spots: disease or sunburn? I moved some small basjoo out into the sun this summer, and they got identical looking small spots. They started to go away once they got back to partial shade. I'm sure your problem is sunburn. __________________ Susan Last edited by 1aday : 01-17-2010 at 11:59 AM. Reason: What I meant to say was that the new leaves didn't have spots, not that the spots themselves went away.

01-17-2010, 11:39 AM	#10 (permalink)
coast crab garden variety plant nerd coast crab's Photo Gallery Location: Lovely Mobile, Alabama - The Heart of Dixie Find me on the map! Zone: 8b Name: Russell Join Date: Jul 2009 Posts: 427 BananaBucks : 49,542 Feedback: 0 / 0% Said "Thanks" 29 Times Was Thanked 409 Times in 178 Posts Said "Welcome to Bananas" 5 Times	Re: black spots: disease or sunburn? Thanks everyone. Thirteen nights in a row of 20 degree weather "cured" the black spots! Russell __________________

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