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Main Banana Discussion This is where we discuss our banana collections; tips on growing bananas, tips on harvesting bananas, sharing our banana photos and stories.


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Old 06-07-2019, 11:02 AM   #1 (permalink)
 
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Default black stuff on leaves

Hi does anyone know what this is and if I need to worry about it.
best wishes and thanks to anyone who may be able to help.
Peego.

https://photos.google.com/photo/AF1Q...H3c4jvVApyuBAa

https://photos.google.com/photo/AF1Q...IN_vFHd9qBloaj
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Old 06-07-2019, 02:48 PM   #2 (permalink)
 
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Default Re: black stuff on leaves

Photo links do not work.
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Old 06-07-2019, 04:28 PM   #3 (permalink)
 
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Default Re: black stuff on leaves

https://photos.app.goo.gl/4bzyEfwE2xsepFf48

Thanks for letting me know, hopefully this works.
best wishes

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Old 06-07-2019, 04:31 PM   #4 (permalink)
 
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Default Re: black stuff on leaves

https://photos.app.goo.gl/1qenWVgfrWd25XF39
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Old 06-07-2019, 06:09 PM   #5 (permalink)
 
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Default Re: black stuff on leaves

Tell us more about the plant and post a pic of the entire plant & pot.
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Old 06-07-2019, 06:59 PM   #6 (permalink)
 
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Default Re: black stuff on leaves

We have had something that looks very similar on E. ventricosum which we think happened when it got too wet. We cut off as much as we could and it seems plants are recuperating. Others which were grown drier did not have the problem.
BUT, this is just an assumption on our part :-(
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Old 06-08-2019, 12:34 AM   #7 (permalink)
 
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Default Re: black stuff on leaves

Hi,
Thanks for both your comments, I appreciate you taking the time to reply.

Its a Musa basjoo, I've had it for a couple of months and it has grown really well and as quickly as expected. Its in a pot with a mixture of JInumber 2 and perlite, 50:50.
As I said it has been growing quickly, the last leaf as you can see turned out a bit thin and misshapen. The next cigar leaf has a small stain on it but looks to be growing at a normal rate.

There is the odd aphid around which I spray. I have looked hard for spidermite and cannot see any.

I'm in the UK. its been raining for what seems like ages and so I have kept it inside but take it out when ever the sun comes out.

https://photos.app.goo.gl/vjBW8cmzhFGVdbqo6

best wishes
Adnan
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Old 06-08-2019, 03:26 AM   #8 (permalink)
 
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Default Re: black stuff on leaves

Hi Adnan,

I'm British too, but right down south in Hampshire. We've had so little rain so far this year that if you want to send a few gallons we'd be very grateful. Grass verges etc were totally parched until yesterday when a few mm fell. My plants now suddenly look like they've had life breathed back into them; tap water is ok but some lovely soft English rain is their drink of choice.

Am wondering if it's a little bit of sooty mould on those leaves? I'm by no means an authority so it's just a shot in the dark.

The leaf distortion may possibly just be the way these plants sometimes react to a change of scenery and/or growing medium.

Have you given it a spray of fungicide just in case? Maybe a bit of Roseclear or similar could help?

Maybe a shufti under magnification could help identify the little vandals? I'd definitely not overwater it until the top few CMs are dry, and even then try to give it rainwater rather than tap water, and when you feed it do so sparingly, in much weaker dilutions than those stated until it starts to grow away rampantly. I've seen young plants die from excessively generous feeding.

Best of luck my Salopian mate, Dave.
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Old 06-08-2019, 03:46 AM   #9 (permalink)
 
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Default Re: black stuff on leaves

Hi Dave,
Thanks so much for your kind thoughts and helpful comments.
I was using tap water so your tip about rainwater is really valued and I will switch asap.
Its been grim here in Shropshire but glad its been sunny for you, perhaps less so for your plants! Rain forcast here for the rest of the week...
best wishes
Adnan
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Old 06-08-2019, 04:15 AM   #10 (permalink)
 
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Default Re: black stuff on leaves

Thank you Adnan. Same forecast for here this week, 80% chance of rain every day except Monday. I'm looking on Ebay at these 1000 litre IBC liquid storage tanks. They seem to be well suoited to storing a lot of rainwater, and if I can filter it as it comes out it should be very tasty for the plants. Probably quite nice for the humans too (after UV treatment of course, as the birds don't stick to the same toilet rules as us lot!). If the 'balloon goes up' and we lose our access to fresh water it could be a lifesaver, after the plants have had a drink of course!
Have a great weekend and hopefully that little plant will soon be 'as right as rain'.
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Old 06-08-2019, 08:59 AM   #11 (permalink)
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Default Re: black stuff on leaves

Quote:
Originally Posted by Peego View Post
Looks somewhat normal for an older leaf on a plant.
The leaf breaks/pulls away from main stem and starts to deteriorate.
If it gets too unsightly you may cut it off.
Looks like a nice plant too.

Seems the plant being grown indoors and that could be an issue with excess moisture ?

Last edited by cincinnana : 06-08-2019 at 09:08 AM.
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Old 06-08-2019, 09:43 AM   #12 (permalink)
 
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Default Re: black stuff on leaves

Hi Cincinanna,
Thanks for taking the time to reply, I'm grateful for your tips and thoughts about my plant.
I will do what I can to make sure its not too wet.
Best wishes
Adnan
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Old 06-08-2019, 10:24 AM   #13 (permalink)
 
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Default Re: black stuff on leaves

The picture of the pot is not as clear as I was hoping for. But, it does show there is no saucer under the pot and no water or soil on the table top. I can only conclude the pot soil is water logged or very soggy in the bottom of the pot.


Even tho you are using a 50/50 mix of potting soil & perlite its purpose is defeated with the non draining pot. ... The pot & soil MUST drain all free water out! Bananas (& many other plants) do not like their feet (roots) to be in water or stale water. And, soggy soil blocks air to the roots.


As pjkfarm said above and I concur ... the pot is too wet ... This is the beginnings of root rot. ... It does little good to tell you the plant/pot is wet if we cant tell you why it was happening. Thus the need for full picture of the plant and pot.




Repotting is in order for the plant to survive.

  • For an indoor banana plant, you need a saucer under the pot. Put a riser/spacer under the pot so the drain holes are above any water that drains out. Discard and water that drains; ... at least do not re-use to water the plant. You can leave the water in the saucer for humitity to the plant.
  • If when watering, ... water doesn't drain from the bottom within a few seconds (20 or 30); then the potting mixture is not course enough. Add more perlite. A 25%/75% potting soil/perlite is good. ... I have & do used a fast draining soil mix in the bottom 1/3 of the pot with the corm sitting in course sand for the upper 2/3 of the pot. The corm neck/crown needs to be above the soil. Use course builders sand; pool filter sand; but do not use fine Play Sand.
  • Trim off any black roots and soft black parts of the corm. Sterilizing the corm with household bleach water for a couple of minutes to kill any rot & fungus.
Fast draining means you pour water in the top of the pot and you see water running out the bottom immediately. You only want to wet the potting soil and not retain water between the soil particles like a sponge.


Good luck with you plant. ... OH the plant is lonely buy two more ... 3 is a party.
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Old 06-08-2019, 03:58 PM   #14 (permalink)
 
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Default Re: black stuff on leaves

Hi edwmax,
Thanks so much for such a helpful, detailed and thoughtful response.
I really appreciate you taking the time to reply and help me out.
The pot is usually sat in a plastic tray; I just put it on the table to take the photo.
I will get to work repotting.
Thanks again.
Adnan
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Old 06-09-2019, 04:11 AM   #15 (permalink)
 
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Default Re: black stuff on leaves

How much bleach should I put in the water?
best wishes
Adnan
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Old 06-09-2019, 05:44 AM   #16 (permalink)
 
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Default Re: black stuff on leaves

Quote:
Originally Posted by Peego View Post
How much bleach should I put in the water?
best wishes
Adnan



A strong solution like you would use around the house for cleaning. .... Since this is not fruit to be eaten, 2/3 cup to a gallon of water will make a solution of about 2200 ppm for cleaning very dirty items and kill any infection or pest that may be on the corm.


ref: htttp://ucfoodsafety.ucdavis.edu/files/26437.pdf
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Old 06-09-2019, 06:28 AM   #17 (permalink)
 
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Default Re: black stuff on leaves

Thanks for that,much appreciated.
best wishes
Adnan
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