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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 10-15-2012, 05:32 AM   #1 (permalink)
 
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Default Bunchy top?

Hi all

My Cavendish Banana has suddenly started growing smaller leaves. I initially thought it was about to flower, however leaves are still sprouting - just small ones. I am worried it may have bunchy top.

I have attached some pics. Next to it are some Lady Finger types without any such symptoms.

If anyone could assist, it would be much appreciated.

(Photos in my gallery)
Banana Gallery - delonix87 Gallery

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Old 10-15-2012, 07:49 AM   #2 (permalink)
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Default Re: Bunchy top?

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Old 10-15-2012, 10:30 AM   #3 (permalink)
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Default Re: Bunchy top?

Better photos of specific areas will probably be more helpful.

Morse code and green J-hooks
[IMG][/IMG]

U of H 2006
Banana Bunchy Top Disease in Hawaii: Symptoms, Diagnosis and Management

U of H 2004
http://www.ctahr.hawaii.edu/bbtd/dow...TV-details.pdf

U of H 1997
http://www2.ctahr.hawaii.edu/oc/freepubs/pdf/PD-12.pdf

Symptoms of BBTV
The initial symptoms of banana bunchy top virus consist
of dark green streaks in the veins of lower portions
of the leaf midrib and the leaf stem (petiole) (Figure 1).
The streaks also occur, but are less prominent, in the
veins of the leaf blade (lamina). This symptom is sometimes
referred to as “Morse code streaking” because the
streaks are irregular and resemble a series of “dots” and
“dashes.” Rubbing away the waxy white coating that
covers the petiole or midrib makes it easier to see the
streaking. Also, dark green, hook-like extensions of the
leaf lamina veins can be seen in the narrow, light-green
zone between the midrib and the lamina (Figure 2). The
short hooks point down along the midrib toward the
petiole. They can best be seen by back-lighting the leaf
against the sky.
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Old 10-15-2012, 10:42 AM   #4 (permalink)
 
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Default Re: Bunchy top?

Banana plants sometimes make leaves like that and it has nothing to do with BBTV: they are just unhappy. For example, my cool-intolerant ones do that during winter.

Are you in an area where BBTV is present? If not, it probably isn't BBTV unless you recently imported bananas and their aphids from a BBTV infected area. A good close up of where the leaf blade connects to the midrib would show the "j-hooks" that are present when a plant has BBTV.
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