-
- Biology of the Beast
- Hosts & Range
- Range of DRA ~ range of Fd in BC
- Hosts
- Susceptible: Fd, B, S, Hw
- Tolerant/ resistant
- Lw - early mortality (fast root growth) ... but resistant@~15-20yr
- Cw develops resistance when quite young
- hardwoods (&shrubs) ... but age (40y+r)
- Coast vs Interior (tree age)
- coast - not significant (mort. up to 15yr)
- ICH - universally present
- others (IDF, SBS, ESSF, MS) - patches (1-10+ ha)
- Infection - spores rare, veg. via root contact or rhizomorph
- spread
- endotrophic mycelium (in live bark/cambium - mycelial fans)
- rhizomorphs
- in sapwood (CODIT reactions)
- in heartwood when present (i.e. large roots)
- rate ~10-25 cm/yr
- tree vigour - inoculum potential - flare-ups
- quiescent vs. active
- damage (same as DRL)
- mortality
- girdling (young or stressed)
- windthrow/ windbreak (older)
- reduced increment
- decay (limited)
-
- general root disease symptoms
-
-
- coast vs. interior
- ICH vs PP vs rest of interior
- @ harvest/ regeneration
- alternate species (50-100%)
- conifers (Lw, Cw)
- hardwoods (but more susc. @ 40+yrs)
- (then possibly pines)
- so ... at least 50% Lw, Cw, hardwoods
- inoculum removal
- Young Stands @ JS - favour alt. spp.
- low - favour "up to" mod. spp.
- mod
- only if >max density
- ... talk to a specialist
- need lotsa 'alt spp' , i.e. susc. trees <20%
- inoculum removal (pop-up spacing) - exper.
- high - do nothing, accept reduced stocking, rehab?
- beware of brushing (hardwoods)
- flare-up
- IF needed ... do early (smaller stumps)
- partial harvest
- risky ... "flare-up" ~5 yrs after (bad)
- multiple entries favour DRA (bad)
- not for ICH
- for other eco-zones
- be careful!
- perhaps patch-cut & remove inoculum
- or need lotsa alt. species (susc. <20%)
