Arborist News quizzes are available free online to members for one year after the date of publication; a maximum of six quizzes are available at any time. CEU quizzes for older articles may be purchased by both members and non-members.
Sunken, loose bark, or oozing sap on trunks or limbs may indicate a canker, especially if associated with branch dieback. On trees, cankers are areas of localized necrosis of the bark and cambium, caused by a plant pathogen, typically a fungus or bacteria. Some canker-causing pathogens are a minor pest of trees, while others may cause branch failure or even tree death. Management of canker diseases focuses primarily on prevention and sanitation. (A, M, T, Bs, Bp)
CEUs for this quiz may be earned only once during the life of your certification.