View Full Version : Black/Yellow Sigatoka?
CountryBoy1981
09-26-2012, 04:12 PM
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
http://s12.postimage.org/8n31worhl/Gran_Nain.jpg (http://postimage.org/image/8n31worhl/)
Dwarf Cavendish
http://s16.postimage.org/x30tmfvw1/Dwarf_Cavendish.jpg (http://postimage.org/image/x30tmfvw1/)
Dwarf Red
http://s12.postimage.org/mec4cn5t5/Musa_Dwarf_Red.jpg (http://postimage.org/image/mec4cn5t5/)
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
CountryBoy1981
09-26-2012, 05:05 PM
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.
CountryBoy1981
09-26-2012, 05:12 PM
Here are some better photos:
Gran Nain
http://s17.postimage.org/98e276dvv/Gran_Nain.jpg (http://postimage.org/image/98e276dvv/)
Dwarf Cavendish
http://s11.postimage.org/utv115cgv/Dwarf_Cavendish.jpg (http://postimage.org/image/utv115cgv/)
Dwarf Red
http://s9.postimage.org/crp3skfzv/Dwarf_Red.jpg (http://postimage.org/image/crp3skfzv/)
CountryBoy1981
09-26-2012, 05:54 PM
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.
alemily
09-26-2012, 06:47 PM
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.
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
sandy0225
10-12-2012, 07:41 AM
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.
sandy0225
10-12-2012, 07:44 AM
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.
PR-Giants
10-12-2012, 08:44 AM
My first guess is a root problem, probably over watering.
CountryBoy1981
10-12-2012, 09:21 AM
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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