![Napier Grass Stunt ► How to tell the difference
The contrast between unaffected
and diseased plant parts is very
important in field diagnosis.
Left: the unaffected, sturdy
shoot is greener than the yellow,
thin diseased shoots either side.
Right: the vigorous young shoots
are more robust than the weedy
shoots that proliferate at the base
of diseased clumps. Contrast
bottom left, diseased, with
bottom right, unaffected.
Below: Differences exist between
the yellow leaves on the right and
the unaffected, green leaves,
though they are both similar in
size and form.
We say ‘unaffected’ rather than
‘healthy’ since the phytoplasma
can be present without any
symptom expression.
Red triangle: diseased. White triangle: unaffected. We gratefully acknowledge the assistance of Namulonge Research
Institute, Uganda in obtaining these photographs. Napier grass is also known as elephant grass.
TEXT: Eric Boa and Phil Jones. PHOTOS: Eric Boa. GLOBAL PLANT CLINIC [www.globalplantclinic.org] 6 July 2005](https://image.slidesharecdn.com/napiergrassfielddiagnosis-100511030155-phpapp01/85/Napier-grass-stunt-how-to-tell-the-difference-1-320.jpg)
![Napier Grass Stunt ► How to tell the difference
The contrast between unaffected
and diseased plant parts is very
important in field diagnosis.
Left: the unaffected, sturdy
shoot is greener than the yellow,
thin diseased shoots either side.
Right: the vigorous young shoots
are more robust than the weedy
shoots that proliferate at the base
of diseased clumps. Contrast
bottom left, diseased, with
bottom right, unaffected.
Below: Differences exist between
the yellow leaves on the right and
the unaffected, green leaves,
though they are both similar in
size and form.
We say ‘unaffected’ rather than
‘healthy’ since the phytoplasma
can be present without any
symptom expression.
Red triangle: diseased. White triangle: unaffected. We gratefully acknowledge the assistance of Namulonge Research
Institute, Uganda in obtaining these photographs. Napier grass is also known as elephant grass.
TEXT: Eric Boa and Phil Jones. PHOTOS: Eric Boa. GLOBAL PLANT CLINIC [www.globalplantclinic.org] 6 July 2005](https://image.slidesharecdn.com/napiergrassfielddiagnosis-100511030155-phpapp01/75/Napier-grass-stunt-how-to-tell-the-difference-1-2048.jpg)
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Napier grass stunt: how to tell the difference
The document discusses the visual differences between unaffected and diseased napier grass plants. It highlights how the sturdier, greener unaffected shoots contrast with yellow, thin diseased shoots, emphasizing the importance of these distinctions for field diagnosis. The content also notes that the term 'unaffected' is used instead of 'healthy' because phytoplasma can be present without visible symptoms.
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Napier grass stunt: how to tell the difference
- 1. Napier Grass Stunt► How to tell the difference The contrast between unaffected and diseased plant parts is very important in field diagnosis. Left: the unaffected, sturdy shoot is greener than the yellow, thin diseased shoots either side. Right: the vigorous young shoots are more robust than the weedy shoots that proliferate at the base of diseased clumps. Contrast bottom left, diseased, with bottom right, unaffected. Below: Differences exist between the yellow leaves on the right and the unaffected, green leaves, though they are both similar in size and form. We say ‘unaffected’ rather than ‘healthy’ since the phytoplasma can be present without any symptom expression. Red triangle: diseased. White triangle: unaffected. We gratefully acknowledge the assistance of Namulonge Research Institute, Uganda in obtaining these photographs. Napier grass is also known as elephant grass. TEXT: Eric Boa and Phil Jones. PHOTOS: Eric Boa. GLOBAL PLANT CLINIC [www.globalplantclinic.org] 6 July 2005