CANKERS

Question 1

What are some common canker causes?

Answer 1

• Sunscald
• Frost
• Bacteria
• Fungus

Question 2

Where can canker infections begin in trees?

Answer 2

insect wound
mechanical wound
lenticels
leaf scars
invasion from dead bark

Question 3

What are some host resistances to cankers?

Answer 3

• Production of cork tissue from the periderm seals off infection, killing outside tissue.

Question 4

What is an exophylactic periderm?

Answer 4

• Stretch
• Smooth bark
• advantage is that skin is constantly peeling off, ditching potential disease

Question 5

What is the necrophylactic periderm?

Answer 5

Type of periderm that responds to wound

Question 6

What are the three canker types?

Answer 6

• Annual - tree walls off infection and wins (Fomopsis)
• Perennial - recurring every year (tree walls off during frowing season but infection wakes up first after winter)
• Diffuse - wins and kills (chestnut blight)

Question 7

What are cankers

Answer 7

localized area of dead bark tissue