A professor's casual hike in the High Sierra turned into a new elevation record for California's highest tree, the Jeffrey pine, which wasn't formerly known to grow at extreme elevations.

There are many other old-growth forests across the continent. Each of these forests has a unique ecology, but all are under ...

For chemical pest control, timing of pesticide applications is just as important as positively identifying the problem and selecting the right pesticide. Following are some plant diseases controlled i ...