Yellow sigatoka disease is caused by Mycosphaerrela musicola. It is characterised by appearance of small yellow specks (1-
2mm long) on the leaf, parallel to the secondary veins of the blade.

The Yellow specks develop into necrotic spots, which are more or less round and are surrounded by a yellow halo.
The necrotic pathes may go up the leaf.

The lesions on most susceptible clones past through six stages to maturity

  • Minute yellowish green specks
  • Specks grow into yellowish green to yellow streaks,visible on the upper side of the leaf
  • The streaks expand and gradually change to brown orrusty red spots with undefined margins
  • The spots obtain a definite outline with a brown centre and a yellow to light brown halo sometimes with awater soaked centre
    The dark centre sinks and the water halo turns darker brown
  • The sunken central area turns grey and is surrounded by a dark brown or black border with a yellow halo
    between the border and the normal green leaf.

 

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The vast majority of the bananas currently grown and consumed were not conventionally bred but are selections made over probably thousands of years from naturally occurring hybrids. Cultivated bananas are very nearly sterile and as a consequence are not propagated from seed but rather through vegetative propagation, primarily suckers as well as more recently micropropagated or tissue cultured bananas. These factors, very old selections, near sterility and vegetative propagation, mean that these bananas have not been genetically improved either for resistance or improved quality and are becoming increasing in affected by serious pests and diseases.

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