DRN

Question 1

Hosts and range of Spruce DRN?

Answer 1

• Coast and interior wet belt

- Hemlock, Balsam, Spruce hosts

Question 2

How does DRN spread?

Answer 2

• primary wound invader (spores)
• P strain travels along roots
• S strain (butt rot, but can kill young trees up till about JS size)

Question 3

What is the main diagnostic symptom of annosus?

Answer 3

White decay with black flecks throughout

Question 4

Describe the conk for annosus

Answer 4

• Can be resupinate or shelf like
• found at base of tree/underside of roots
• Brown on top
• Holographic bottom

Question 5

How is DRN managed at harvest?

Answer 5

-Stumping is not very effective due to spore infection ability.

Question 6

How is DRN managed at JS?

Answer 6

• JS creates wounds due to root grafting with remaining trees
• Stumps can be treated with borax

Question 7

What are the two strains of DRN? Which in BC?

Answer 7

• H. irregulare Pine strain (similar to DRL, Eastern canada-California.)
• H. occidentale Spruce strain (In BC, A but rot with limited ability to travel along roots.)