Rapid temperature changescan causetree bark to split

Tree bark expands in warmer weather then contracts as temperatures dropsometimes causingbark to split

Eventually the gasses and fluids work their way out of the treesometimes causingbark to split

In this article , you discoveredcausestree bark to split

Cold damagealso can causebark to split

Warm sun followed by a cold winter nightcan causebark to split

Alternate freezing and thawing in the wintercan also causebark to split

Prolonged high populationscan causebark to split

Warm spells followed by a sudden drop in temperaturescan even causebark to split

when internal defects or bark injury results in tissues that expand and contrast at different pacescausingbark to split

http://EzineArticles.com/63375 Winter tree wrapping will helppreventbark splitting on exposed trees

various forms of stress(passive) may be caused byBark splitting on trees