India, Oct. 10 -- At the beginning of the 20th century, Russian olive was introduced to North America as a tree that could serve as a windbreak, prevent erosion, and provide wildlife shelter. The California Department of Fish and Wildlife describes the deciduous species as native to Europe and Asia. Over time, however, the tree became an invasive plant in parts of the United States.

The tree can spread beyond cultivated areas, particularly along riparian zones, the bands of land bordering rivers and streams. It is now considered invasive in much of California and in 16 other Western states. Once established, Russian olive can displace native plants, hinder their growth, and alter stream-bank hydrology. It is also difficult to remove beca...