black disease on leaves

cromulentkevin · 08-17-2009, 12:55 PM

I am actually quite ignorant when it comes to bananas, so I figured I should ask some knowledgeable people. I believe this is a basjoo. Below is some links which hopefully work correctly and show images of what I'm talking about. Basically a new leaf comes out fine and the banana is continuing to grow and get bigger. However, after coming out, the new leaves quickly start getting what appears to be black mildew/disease and the leaf quickly declines. It grows fast enough to keep producing new leaves, but it is weird the leaves decline this quickly I think. I'm not sure if this is a disease or some sort of cultural thing (water, sun, etc). The black stuff does not rub off, but is an internal part of the affected leaf. I have sprayed with some fungicides and things and it didn't seem to have any change. I have many other varieties of banana, but this is the only one doing this. Any help would be greatly appreciated.

Simply Bananas · 08-17-2009, 02:01 PM

Where are you located, in the south I'm guessing?

Caloosamusa · 08-17-2009, 02:08 PM

This picture does not look like Black Sigatoka, but what you discribe is very much like the behavior of Black Sigatoka. What Fungicides did you use?

cromulentkevin · 08-17-2009, 02:50 PM

I should have mentioned my location. . .I'm inland southern california. . .zone 9b. . .pretty harsh sun/heat, low humidity, etc.

Simply Bananas · 08-17-2009, 03:20 PM

Quote:

Originally Posted by cromulentkevin

I should have mentioned my location. . .I'm inland southern california. . .zone 9b. . .pretty harsh sun/heat, low humidity, etc.

This happens to some basjoos here in the south. I do not know the cause, but hot dry weather makes mine look that way too. They seem to like it less than 85f more(at least mine do).

cromulentkevin · 08-17-2009, 04:22 PM

Quote:

Originally Posted by Simply Bananas

This happens to some basjoos here in the south. I do not know the cause, but hot dry weather makes mine look that way too. They seem to like it less than 85f more(at least mine do).

I actually was wondering if it is getting too much heat. I have a lot of canopy in my yard due to taller trees, but this location gets blasted pretty good middle of the day. Obviously in my part of the country it is very frequently over 85 degrees. Since basjoo is supposedly cold hardy, I have wondered if like some palm trees (such as Rhopalostylis) it also resents too much heat. I.e. it prefers an overall mild climate, not the extremes of heat and cold one finds in california desert.

cromulentkevin · 08-24-2009, 04:36 PM

Sorry to bump my own thread, but I don't feel I really arrive at a consensus yet. Anyone else care to offer their opinion as well?

Bch Grl · 08-24-2009, 08:57 PM

Not real sure what that is, but after seeing a presentation on plant diseases, I would guess it's a bacteria. No, it's not "wet"...not a bacteria.....but probably something bad.
Sorry to say, I would yank it out and dispose of it.
Try contacting this man....
Robert Cating
Grad research Asst, Diseases of Orchids
Plant Pathology Dept, UF
Plantmd@ufl.edu

He gave a great talk on orchid diseases at Jackosnville Orchid Society and is very knowledgeable re: plant diseases!

Margie

LilRaverBoi · 08-28-2009, 12:09 PM

So I just noticed this (or something very very similar) happening on my Ensete Maurelii. The older leaves have areas of black streaks/areas. That plant has been nothing but problems since I've had it...they're beautiful plants, but I'm tempted to get rid of it if it doesn't just grow normally WITHOUT issues!

Any information you can offer me on such an issue would be greatly appreciated!

Velutina · 08-28-2009, 02:07 PM

My guess would be fungus. If contact fungicide did not work, try a systemic fungicide.

sandy0225 · 08-28-2009, 03:53 PM

it looks like some kind of an environmental stress reaction to me. The newer leaves don't look like that, right (hard to see in the picture). Cut off the leave that bother you and see if it doesn't just grow out of it. Definitely not a cause for destruction of the plant.
Also do you have spider mites?

08-17-2009, 12:55 PM	#1 (permalink)
cromulentkevin cromulentkevin's Photo Gallery Join Date: Aug 2009 Posts: 6 BananaBucks : 2,918 Feedback: 0 / 0% Said "Thanks" 0 Times Was Thanked 0 Times in 0 Posts Said "Welcome to Bananas" 0 Times	black disease on leaves I am actually quite ignorant when it comes to bananas, so I figured I should ask some knowledgeable people. I believe this is a basjoo. Below is some links which hopefully work correctly and show images of what I'm talking about. Basically a new leaf comes out fine and the banana is continuing to grow and get bigger. However, after coming out, the new leaves quickly start getting what appears to be black mildew/disease and the leaf quickly declines. It grows fast enough to keep producing new leaves, but it is weird the leaves decline this quickly I think. I'm not sure if this is a disease or some sort of cultural thing (water, sun, etc). The black stuff does not rub off, but is an internal part of the affected leaf. I have sprayed with some fungicides and things and it didn't seem to have any change. I have many other varieties of banana, but this is the only one doing this. Any help would be greatly appreciated.

08-17-2009, 02:01 PM	#2 (permalink)
Simply Bananas Formerly known as porkpi Simply Bananas's Photo Gallery Location: James Island SC Find me on the map! Zone: 8b-9a Join Date: Apr 2006 Posts: 854 BananaBucks : 294,707 Feedback: 2 / 100% Said "Thanks" 478 Times Was Thanked 1,191 Times in 335 Posts Said "Welcome to Bananas" 458 Times	Re: black disease on leaves Where are you located, in the south I'm guessing? __________________ Afterall...doesn't everyone want a bigger Banana? Our Banana Videos On YouTube: https://www.youtube.com/channel/UCii..._p_tJVXZOHAdRA

08-17-2009, 02:08 PM	#3 (permalink)
Caloosamusa Caloosamusa's Photo Gallery Find me on the map! Join Date: Mar 2008 Posts: 3,578 BananaBucks : 28,153 Feedback: 1 / 67% Said "Thanks" 3,829 Times Was Thanked 1,556 Times in 675 Posts Said "Welcome to Bananas" 334 Times	Re: black disease on leaves This picture does not look like Black Sigatoka, but what you discribe is very much like the behavior of Black Sigatoka. What Fungicides did you use?

08-17-2009, 02:50 PM	#4 (permalink)
cromulentkevin cromulentkevin's Photo Gallery Join Date: Aug 2009 Posts: 6 BananaBucks : 2,918 Feedback: 0 / 0% Said "Thanks" 0 Times Was Thanked 0 Times in 0 Posts Said "Welcome to Bananas" 0 Times	Re: black disease on leaves I should have mentioned my location. . .I'm inland southern california. . .zone 9b. . .pretty harsh sun/heat, low humidity, etc.

08-24-2009, 04:36 PM	#7 (permalink)
cromulentkevin cromulentkevin's Photo Gallery Join Date: Aug 2009 Posts: 6 BananaBucks : 2,918 Feedback: 0 / 0% Said "Thanks" 0 Times Was Thanked 0 Times in 0 Posts Said "Welcome to Bananas" 0 Times	Re: black disease on leaves Sorry to bump my own thread, but I don't feel I really arrive at a consensus yet. Anyone else care to offer their opinion as well?

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08-24-2009, 08:57 PM	#8 (permalink)
Bch Grl I'm in Zone denial! Bch Grl's Photo Gallery Location: Jacksonville, FL Find me on the map! Zone: They say 9, but I think it's more like 8. Name: Margie Join Date: Aug 2007 Posts: 203 BananaBucks : 34,548 Feedback: 2 / 100% Said "Thanks" 339 Times Was Thanked 136 Times in 51 Posts Said "Welcome to Bananas" 90 Times	Re: black disease on leaves Not real sure what that is, but after seeing a presentation on plant diseases, I would guess it's a bacteria. No, it's not "wet"...not a bacteria.....but probably something bad. Sorry to say, I would yank it out and dispose of it. Try contacting this man.... Robert Cating Grad research Asst, Diseases of Orchids Plant Pathology Dept, UF Plantmd@ufl.edu He gave a great talk on orchid diseases at Jackosnville Orchid Society and is very knowledgeable re: plant diseases! Margie

08-28-2009, 12:09 PM	#9 (permalink)
LilRaverBoi Nanner Time! LilRaverBoi's Photo Gallery Location: Cedar Rapids, IA Find me on the map! Zone: 5 Name: Bryan Join Date: Mar 2009 Posts: 2,937 BananaBucks : 119,539 Feedback: 0 / 0% Said "Thanks" 534 Times Was Thanked 2,243 Times in 1,245 Posts Said "Welcome to Bananas" 855 Times	Re: black disease on leaves So I just noticed this (or something very very similar) happening on my Ensete Maurelii. The older leaves have areas of black streaks/areas. That plant has been nothing but problems since I've had it...they're beautiful plants, but I'm tempted to get rid of it if it doesn't just grow normally WITHOUT issues! Any information you can offer me on such an issue would be greatly appreciated! __________________ BANANA RAVE! Feel the beat from start to stop, dancin' and movin' from bottom to top! lilraverboi@genxglow.com RIP Tog Tan. We love you and will always remember you! I'm Bryan with a Y! There is no 'I' in BRYAN!

08-28-2009, 02:07 PM	#10 (permalink)
Velutina Location: Miami Zone: 10b Join Date: May 2008 Posts: 276 BananaBucks : 49,983 Feedback: 0 / 0% Said "Thanks" 100 Times Was Thanked 345 Times in 144 Posts Said "Welcome to Bananas" 0 Times	Re: black disease on leaves My guess would be fungus. If contact fungicide did not work, try a systemic fungicide. __________________ Adam

08-28-2009, 03:53 PM	#11 (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: 1,718 BananaBucks : 364,028 Feedback: 31 / 97% Said "Thanks" 38 Times Was Thanked 1,801 Times in 682 Posts Said "Welcome to Bananas" 9 Times	Re: black disease on leaves it looks like some kind of an environmental stress reaction to me. The newer leaves don't look like that, right (hard to see in the picture). Cut off the leave that bother you and see if it doesn't just grow out of it. Definitely not a cause for destruction of the plant. Also do you have spider mites? __________________ 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!

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