降雨在病害传播中发挥了重要作用。

Rainfall played an important role for disease dispersal.

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动植物病害传播极快。

Disease of animal and vegetable pests propagate with extreme rapidity.

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要在美洲种植橡胶树很难，因为有一种叫做“叶枯病”的病害存在，橡胶树的间距必须很大（译者注：防止病害传播）。

Growing Hevea in the Americas is hard. A disease called leaf blight means the trees have to be spaced widely.

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