Atropellis Canker Flashcards
What densities of stands are most likely to be affected by atropellis?
Dense stands
What decides tree resistance to atropellis?
- young trees immune (less than 15 years)
- vigorous trees can fight off atropellis
- In Trees over 15 years resistance is related to tissue age
(0-5 resistant)
(5-10 very few infections)
(10-25 most susceptible)
(25+ years very few infections)
In words, what parts of trees over 15 years old are most susceptible to atropellis?
Younger part of crown does not get infected but the lower part of the tree that is older is more likely to get infected.
What are the signs and symptoms of atropellis?
- long narrow canker
- resinosus
- black stain in wood
- black specs on wood (fruiting body)
A friend phones you up and says he has a stem infection on Pl in the interior.
-Dwarf mistletoe
-Black stain
-Blister rusts
-Atropellis
(PROVIDE SYMPTOMS)
What are the damaging effects of atropellis?
- weak wood in effected areas from non woody cells
- deformity (hard to debark)
- stain (bleacking/aesthetics)
- resin hinders pulping process (reject)
- lumber losses up to 33%
- pulp chip rejects to 33%
- overall loss in value 33%
What things increase mortality from atropellis?
- more than one canker needed to kill
- dense stands = higher mortality
- north aspect = higher mortality
What things dictate atropellis spread?
- ascospores with 100m range
- can infect apparently undamaged bark
- dense stands more heavily effected
- areas with high summer rainfall more effected
- canker still produces spores 2 years after tree dies
What are the management at harvest for atropellis?
- Mix or alternate species as appropriate
- Mow down infected residuals
- take out infected Pl within 100m of stand (recommended by ministry but not doug)
What are the management at JS for atropellis?
- Pre-commercial thinning by age 15. Cankers will still happen but likely less.
What are the hosts and range of Atropellis
- Pl (Py)
- central south BC
