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Banana Plant Health And Maintenance Topics This forum is for discussions of banana plant health topics such as coloration issues, burning, insects, pruning, transplanting, separating pups, viruses, disease, and other general banana plant health and maintenance issues.


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Old 09-26-2012, 04:12 PM   #1 (permalink)
 
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Default Black/Yellow Sigatoka?

Hello, I have three banana plants, gran nain, dwarf cavendish, and dwarf red. The bottom leaves are yellowing along with some black specks. Is this Sigatoka or what would be the cause of these leaves?


Gran Nain


Dwarf Cavendish


Dwarf Red
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Old 09-26-2012, 05:00 PM   #2 (permalink)
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Default Re: Black/Yellow Sigatoka?

you must add N

add 1/2 gallon urine and it will perk right up
repeat monthly and find a source of K

what is ph of the irrigation water?
we also need your location
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winter winners, jackfruit, carambola, hua moa, d namwah, hak ip lychee with pink leaves 2 days before a cold snap eeeek!

Winter losers, kohala longan, misi luki, 80% jackfruit seedling loss

first bloomers, HUA MOA, DC, D NAMWAH, FHIA 17, KANADARIAN, RAJA PURI, M D NAMWAH

best bunch FHIA 17 , undisclosed

WORST BUNCH hua moa, 2 fingers

Last edited by G.W. : 09-26-2012 at 05:03 PM.
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Old 09-26-2012, 05:05 PM   #3 (permalink)
 
Location: Baldwin County, AL
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Default Re: Black/Yellow Sigatoka?

Quote:
Originally Posted by G.W. View Post
you must add N

add 1/2 gallon urine and it will perk right up
repeat monthly and find a source of K

what is ph of the irrigation water?
we also need your location
location is Baldwin County, AL and the water source is city water.

Last edited by CountryBoy1981 : 09-26-2012 at 05:49 PM.
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Old 09-26-2012, 05:12 PM   #4 (permalink)
 
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Default Re: Black/Yellow Sigatoka?

Here are some better photos:

Gran Nain


Dwarf Cavendish


Dwarf Red
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Old 09-26-2012, 05:54 PM   #5 (permalink)
 
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Default Re: Black/Yellow Sigatoka?

Would that also be the cause of the leaf fold/bend on the dwarf red near the tip of the leaf? There is a bend/fold about 2 inches from the end of each one of the leaves.
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Old 09-26-2012, 06:47 PM   #6 (permalink)
 
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Default Re: Black/Yellow Sigatoka?

Eh, mine turn pale green when they manage to strip the soil of nutrients and need food.

Miracle Grow for Tomatoes is cheap and easy to find around here and works...Walmart, Lowes, Home Depot, etc all carry it.
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Old 09-26-2012, 11:35 PM   #7 (permalink)
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Default Re: Black/Yellow Sigatoka?

MG for tomatoes is gonna be way too high on P
1-0-3 or 2-0-3 is where you should be aiming, not 10-20-10
palm fertilizer normally has a much better ratio for bananas
pee is free and will give you results in less than a week

sigatoka starts with a sploth and turns to a streak
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Winter losers, kohala longan, misi luki, 80% jackfruit seedling loss

first bloomers, HUA MOA, DC, D NAMWAH, FHIA 17, KANADARIAN, RAJA PURI, M D NAMWAH

best bunch FHIA 17 , undisclosed

WORST BUNCH hua moa, 2 fingers
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Old 10-12-2012, 07:41 AM   #8 (permalink)
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Default Re: Black/Yellow Sigatoka?

I haven't noticed that bananas really care what the fertilizer is as long as they're getting plenty when they're actively growing. Yours are going to be really slowing down this time of year even where you live, so don't over do it. You can always keep them limping along and then really crank them next spring. Definitely don't go over the package recommendations this time of year, and even a little less won't hurt during the fall months.
Also, you can start greening them up with a foliar spray of miracle grow type fertilizer. Use about 1 tablespoon in a gallon of water, spray until the top sides of the leaves are wet to the point of runoff. Don't do this on a sunny day, do it when it's cloudy or move them to the shade. Then when they are dry, move it back to the sun. Watch it about a week, then if it's not greening up, do it again next week, you should be able to put some color back in them in a month's time. Once a week. And you won't overdose it and hurt the roots which would cause a whole new set of leaf problems.
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Old 10-12-2012, 07:44 AM   #9 (permalink)
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Default Re: Black/Yellow Sigatoka?

Oh and I wouldn't use urea nitrogen, aka pee, this time of the year unless you use it really diluted. You don't want to burn the roots. Nitrate nitrogen is the preferred form for plants in cool weather and it doesn't cause root burn like urea nitrogen does.
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Old 10-12-2012, 08:44 AM   #10 (permalink)
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Default Re: Black/Yellow Sigatoka?

My first guess is a root problem, probably over watering.
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Old 10-12-2012, 09:21 AM   #11 (permalink)
 
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Default Re: Black/Yellow Sigatoka?

I had just transplanted them into the bigger pots/tubs because they were root bound in the smaller pots. I have laid off the watering since we are getting down into the 60's at night, only 80's during the day now also.
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