一种液态药水，可以杀死真菌。

It is a kind of liquid medicine, and can kill the epiphyte.

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问题在于，我们如何才能做到不伤害宿主只杀死真菌呢?。

So how do you kill a fungus without harming its host?

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在北美和欧洲，像荷兰榆树病这样的真菌疾病已经杀死了数百万棵曾给森林和城市增光添彩的高大树木。

In both North America and Europe, fungus-causing diseases such as Dutch elm disease have killed off millions of stately trees that once gave beauty to forests and cities.

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