This is transmitted by several aphid species and may occur inone form or the other where bananas are grown.
The diseaseis rare and may not be serious.
The most characteristic symptom is the loss of leaf colour in pathes, rendering leaves variegated in appearance. Thevariegations may be roughly parallel to the lateral veins, but not always, giving leaves a striped appearance. As the disease
progresses, leaves emerge, having perhaps one or both sides of the lamina not fully developed so that the leaf margin insteadof being smoothly curved is irregularly wavy, often with blotches of necrotic tissue and the lamina is reduced in width.
Sometimes rotten areas are found throughout the leaf sheaths and the pseudostem.
In cooler areas, rotting of the heart leaf may develop to such an extent that a soft black rot extends right down to the corm(the 'heart rot' condition). The older leaves show black or purple streaks and may shed.
Fruits on infected plants may not show any symptoms or maybe stunted with chlorotic streaks or may show necrosis
Planting matem1 should be checked so as not to introduce the disease to a new plantation. Plants of the tomato and cucumberfamilies, maize, Panicum sp. and Digitalia sp. are known tocarry the virus. Intercropping bananas with such plants should be avoided. Non-host cover crops can be planted to suppress:weeds.
The infected plants must be destroyed by digging them up Eradicate all the suckers in the mat even if they appear healthyWhere possible the-vegetation surrounding the diseased site can be destroyed to kill aphids using malathion or another suitablespray.
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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