Palo Alto Weekly: Why does my tree have white powder on its leaves?
Interior Alaskan forests have only six native tree species: white spruce, black spruce, quaking aspen, balsam poplar, larch (tamarack) and paper birch. Northern Canadian forests have all of those, plus jack pine, balsam fir and lodgepole pine. Since northern Canada and interior Alaska share the same grueling climate and extremes of daylength, why are the Canadian tree species absent from ...
In interior Alaska and some parts of Canada, witches' broom (an abnormal outgrowth of branches of the tree resembling the sweeping end of a broom), is commonly seen on black and white spruce trees. From late fall through the winter, the brooms are dark brown or "dead"looking and are often mistaken for birds' and squirrels' nests.
A very noticeable fall equinox feature in these parts is when deciduous tree leaves turn from green to yellow or orange or sometimes red, then fade and waft to the ground. Middle Alaska doesn’t have many species of deciduous trees: paper birch, aspen, willows and balsam poplar are all part of the dominant boreal forest here.
Powdery mildew on Tatarian maple leaves. Photo courtesy Getty Images. Welcome to our tree column, “Ask your local arborist.” Each month, arborists from the Davey Tree Expert Company in Menlo Park ...
The snarl of a chainsaw never sounds sweeter than when slicing through the trunk of a nasty Bradford pear (Pyrus calleryana). I have railed against the spring-blooming, white-flowering tree for years.
It is common for people in interior Alaska and corresponding areas of northwestern Canada to use the name cottonwood when referring to one widespread variety of deciduous tree.