However, evergreen trees drop older pine needles annually as part of their life cycle. If you see orange or yellow pine needles, this could mean they are at the end of their lifespan. Not only ...

CU biologists Jeff Mitton and Scott Ferrenberg have studied the life cycle and activities of the mountain ... When adult beetles emerge from a tree in late spring, they search for a living pine tree, ...

and to clarify the lasting effects over the rest of the tree's life cycle, from seedling to adult. First, researchers observed that the temperature experienced by maritime pine seeds affected ...