Sphyrapicus varius
Piciformes: Picidae
Identification
This woodpecker is 7 3/4" long with ladder-like black and white bands
down the back and a broad white stripe on each wing. The breast usually
appears whitish but is light yellow in some conditions.
Males have a red throat and top of the head. Females and immatures
have no red coloration.
Damage
Drills 1/4" holes in horizontal or vertical rows in the trunk while
feeding on tree sap.
In the lower midwest, damage is unlikely to harm the tree because
it only occurs as the birds are migrating north in the spring and south
in the fall.
In northern states and Canada in summer and in southern states
in winter, the damage can be severe enough to seriously harm or kill trees.
Scotch pine, Austrian pine, birch, crabapple, maple, and many other
trees are attacked.
Management
Tolerate the damage; its usually not harming the tree.
Wrap damaged areas of trees in the spring and fall. Remove
the wrapping when the migration has ended.