广播电视英语短句 第 144 课：食用木薯-2

Cassava brown streak disease is a more destructive form of cassava mosaic. 褐条病是一种更具破坏性的木薯花叶病形式。

The mosaic has been active in East Africa for about one hundred years. 100年来花叶病在东非一直很活跃。

It limits plant growth. But brown streak can destroy a crop. 它会限制植物的生长.但褐条病也会破坏作物。

The virus was identified in Uganda in two thousand four and has spread fast in areas extending from Lake Victoria. 这种病毒2004年在乌干达被确认出，并且病毒从维多利亚湖迅速扩展。

So far, brown streak has not jumped to Nigeria, the world's largest producer of cassava. 目前为止，褐条病没有波及到世界木薯最大产点-尼日利亚。