Leaves often turn yellow before they drop because the tree harvests many of the nutrients from the leaves before it sheds them. This past month I began to observe that the leaves on some of my maple ...

December is great time to trek the mountains of northwestern Vietnam as maple forests change color from green to yellowish-red. Early winter, forests across the northwestern mountainous region are ...

Chlorosis, a foliage condition in which the leaf veins remain green but the surrounding blade tissue turns pale green or yellow, is a common occurrence among certain tree species on the Northern ...

As leaves die in the fall, color pigments form from sugars trapped in the leaves, producing the different red and yellows and oranges and purples. Bill Kreiger, professor of earth sciences and science ...