In both North America and Europe, fungus-causing diseases such as Dutchelm disease have killed off millions of stately trees that once gave beauty to forests and cities.
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。
2
Holmes crossed two compatible races of ceratocystis ulmi, the causal agent of Dutchelm disease.
霍姆斯曾把荷兰榆病害的致病因子,长喙壳的两个亲和小种杂交。
3
The output was adjusted to the same pitch as the tree's screams and I threatened him with everything from falling branches to Dutchelm disease.