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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

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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