Applewood can be used to create wands, although such wands are rare. The wood does not mix well with Dark magic and favors those with strong ideals. Owners of applewood wands are considered to live long lives and are often known for being able to converse with other magical beings in their own languages (Pm).
The wood and fruit of the apple tree have meanings in the folklore and mythology of many cultures. Rowling appears to have borrowed from Norse folklore when describing the applewood wand holder as being "well-loved and long-lived":
In Norse tradition, the Apple is the tree of immortality. The Goddess Idunn was the keeper of the apples, which she fed the Norse Gods and Goddesses to keep them forever young. Apple wands were also used in Norse love rituals. To the Norse, apples represented long life, wisdom and love (Druidry.com).
The branches of the apple tree tend to be knobbly and twisted. A wand made from an apple branch is not likely to be perfectly straight, but rather would have a few odd angles to it.
From the Web
Apple folklore from Druidry.com, which relates numerous folktales from many traditions about apples and the wood of the apple tree.