Damage Caused By Temperature Extremes

Lab #1 Non-infectious Diseases

Damage Caused By Temperature Extremes

Winter sunscald

Winter Sunscald: The bark has detached on these young maple trees at areas where the cambium was been killed due to inter sunscald. 

Frost cracks on trees

Frost Cracks: Successive years of frost cracks cause large folds of callus to develop. Frost cracks develop in areas where previous wounds were located.

Winter injury

Winter injury from low temperatrures can affect trees that are not well suited to Minnesota's climate. This is yew with the early stages of wintr injury and branches are chlorotic. These affected branches will turn red in time and die. Branches below the snow are usually not affected.