Black spot stem rot! Why? Help!

miaskin · 02-06-2012, 06:34 PM

Hi guys,

I have several few months old plants indoors that are developing black spots. They are becoming wider and become dry to the extend that the leaf above the spot (still green and looking healthy) eventually gets starved.
This is happening in the middle or even lower part of the stem.I am trying to cut these black spots out but it also sometimes significantly damages the stem.
What's happening to them??? Fungus?
I have low humidity, not more than 30%.
Thanks for your help!!!

Alex

caliboy1994 · 02-06-2012, 06:44 PM

Maybe you should post some pics. My bananas are fine with the low humidity here.

Richard · 02-06-2012, 07:04 PM

Yes, picture(s) of the black spots and also of the whole plant(s) including the pot(s) would be helpful. With any luck it is just normal leaf drop.

blownz281 · 02-07-2012, 07:22 PM

I have lost alot of nanners too this..... they come inside,grow great then get skinny and black area. trim back and never makes it.

miaskin · 03-01-2012, 08:45 PM

Hi guys!

I've cought several naners in progress of developing the black rot. Here are the images. I suspect occasional underwatering as a main cause for weakened immune resistance to fungi or something similar.
I had several successful 'surgeries' removing smaller black spots. In these cases it's too late.
Anybody have the same issues or suggested solutions?

Thanks!!!
Alex

paulorph · 03-01-2012, 09:22 PM

Are you sure the corm is dead on that? Looks like the dying tissue is killing healthy tissue around it. Another thing that may be happening is that it is dead all around the plant. The dead tissues seem to shrink. When this happens this can girdle the plant (keep flow of "sap" from roots to top of plant). Make sure there is no green under this. If there is take off the black tissue. Also, with low humidity, you should spray with water. If you dont, plants will get black spots from what I have seen here in Michigan (low humidity during winter).

02-06-2012, 06:34 PM	#1 (permalink)
miaskin N NJ Tropics miaskin's Photo Gallery Location: Bergenfield Find me on the map! Zone: arborday.org hardiness zone: 7 Name: Alex Join Date: Jul 2011 Posts: 21 BananaBucks : 14,673 Feedback: 0 / 0% Said "Thanks" 1 Times Was Thanked 12 Times in 7 Posts Said "Welcome to Bananas" 1 Times	Black spot stem rot! Why? Help! Hi guys, I have several few months old plants indoors that are developing black spots. They are becoming wider and become dry to the extend that the leaf above the spot (still green and looking healthy) eventually gets starved. This is happening in the middle or even lower part of the stem.I am trying to cut these black spots out but it also sometimes significantly damages the stem. What's happening to them??? Fungus? I have low humidity, not more than 30%. Thanks for your help!!! Alex

02-06-2012, 06:44 PM	#2 (permalink)
caliboy1994 <div style="font-style: italic;"><div style="font-style: italic;"></div></div> caliboy1994's Photo Gallery Location: SFV, California Find me on the map! Zone: USDA zone 10a; Sunset zone 18/19 Name: Andreas Join Date: Sep 2011 Posts: 2,301 BananaBucks : 273,108 Feedback: 0 / 0% Said "Thanks" 1,474 Times Was Thanked 2,196 Times in 1,148 Posts Said "Welcome to Bananas" 236 Times	Re: Black spot stem rot! Why? Help! Maybe you should post some pics. My bananas are fine with the low humidity here. __________________ "The ultimate goal of farming is not the growing of crops, but the cultivation and perfection of human beings." ~ Masanobu Fukuoka Find me on linktree here as Solarpunk Farmer: https://linktr.ee/solarpunkfarmer

02-06-2012, 07:04 PM	#3 (permalink)
Richard un-Retired Richard's Photo Gallery Location: Vista, CA Find me on the map! Zone: USDA 10b Name: Richard Join Date: Jan 2008 Posts: 9,674 BananaBucks : 643,176 Feedback: 9 / 100% Said "Thanks" 3,636 Times Was Thanked 12,537 Times in 4,719 Posts Said "Welcome to Bananas" 1,685 Times	Re: Black spot stem rot! Why? Help! Yes, picture(s) of the black spots and also of the whole plant(s) including the pot(s) would be helpful. With any luck it is just normal leaf drop. __________________ Back in business at plantsthatproduce.com

02-07-2012, 07:22 PM	#4 (permalink)
blownz281 Location: Coastal NC Find me on the map! Zone: 8b coastal Join Date: Dec 2008 Posts: 1,373 BananaBucks : 387,599 Feedback: 6 / 100% Said "Thanks" 440 Times Was Thanked 756 Times in 534 Posts Said "Welcome to Bananas" 14 Times	Re: Black spot stem rot! Why? Help! I have lost alot of nanners too this..... they come inside,grow great then get skinny and black area. trim back and never makes it.

03-01-2012, 09:22 PM	#6 (permalink)
paulorph Find me on the map! Zone: 6 Name: Paulo Join Date: Dec 2011 Posts: 73 BananaBucks : 33,721 Feedback: 0 / 0% Said "Thanks" 36 Times Was Thanked 71 Times in 44 Posts Said "Welcome to Bananas" 6 Times	Re: Black spot stem rot! Why? Help! Are you sure the corm is dead on that? Looks like the dying tissue is killing healthy tissue around it. Another thing that may be happening is that it is dead all around the plant. The dead tissues seem to shrink. When this happens this can girdle the plant (keep flow of "sap" from roots to top of plant). Make sure there is no green under this. If there is take off the black tissue. Also, with low humidity, you should spray with water. If you dont, plants will get black spots from what I have seen here in Michigan (low humidity during winter). __________________ Hi from cold Ann Arbor,Michigan! Go Blue!

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