In countries around the world, the oak tree is the symbol of strength, fortitude and endurance. In the U.S., the oak was designated in 2004 as our national tree. Despite this status as a stalwart of the forest and city alike, oaks in our native and urban ecosystems face tremendous challenges from diseases, insect pests and human-caused disorders.
Moment of Nature - May 24, 2013
Alien invasion

