Mycosphaerella eumusae has similar leaf spot characteristics to M. fijiensis and M. musicola.
Primary lesions are brown streaks that expand to form large brown spots.
This stage of the disease is the most recognisable and can be used to distinguish between the three Mycosphaerella leaf spot diseases.
As the disease progresses, spots become grey in the centre but keep a brown border
Leaf spots amphigenous, initially visible as faint brown streaks, developing into oval or elliptical light brown lesions with grey centres and dark brown borders, coalescing to form large, brown necrotic areas under favourable conditions.
Grey spots and patches are visible in necrotic areas, and lesions are surrounded by a chlorotic yellow zone. Pseudothecia amphigenous, predominantly hypophyllous, black, subepidermal, becoming slightly erumpent, globose, up to 80 µm diam., apical ostiole 10–15 µm wide; wall consisting of 2–3 layers of medium brown textura angularis.
straight, obovoid with obtuse ends, widest in the middle of apical cell, medianly 1-spetate or basal cell slightly longer than apical cell, tapering towards both ends, but with more prominent taper towards lower end.
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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