- Dwarf Mistletoe - Mgmt
- Recognition & Assessment
- S&S
- brooms
- tend to be larger on Pl & Fd
- tend to be smaller on Hw & Lw
- 7-Point Hawksworth
- shortcomings
- tops?
- stem infections
- Rating ... Growth Loss
- 0-2 ... 0-5%
- 3 ... 5-15%
- 4 ... 10-35%
- 5 ... 30-70%
- 6 ... 65-95%
- this is tree rating ...
- tree rating vs. stand rating
- stand: H-60% C-40%
- 1/2 of H infected
- typical rating is 3-4
- Simplified "rating & loss"
- at harvest time ...
- 0-2 (5%) loss acceptable
- 3 (~10%) is marginally OK (... sometimes)
- 4+ (10+%) ... losses unacceptable
- heavy infection typically ... 20-40% vol. loss
- Assessment Time
- timber cruising / inventory
- SP - Site Plans (harvest / regen)
- FG surveys
- PST (pre-stand tending) surveys
- Management
- General
- goal: infection rating 2 or less on crop trees
- partial harvest & small blocks ... can be challenging
- Traits in our favour
- obligate ...
- girdle infected residual
- crown closure (esp. young stands)
- host specific ...
- depending on hazard / severity ...
- alt spp. or mix spp.
- slow to develop ...
- takes a while for sig. losses
- shorter rotation age ...
- obvious s&s ...
- OLDER trees
- easy to detect
- trees outgrow it on good sites ...
- yippee
- @ Harvest / Regen
- partial harvest (maybe)
- IF mix spp. and low infection
- <50% host trees (= potential) AND <20% hosts infected (= what is)
- target severe & moderately infected trees (yeah, right ...)
- leave trees should have NO (or light?) infection
- clearcut (easier)
- DMx free boundries
- min. perim/area ratio
- elim. small residuals
- knock down clause (0.5 or 3.0m)
- prescribed burn
- mechanical (interior)
- mix spp. over entire block
- alt. spp. close to infected trees
- dense stand ... crown closure
- @ FG / JS
-
- 1) infected overtopping tree <10 m from infected resid
- 2) overtopping = 3x's the median ht of regen
- 3) tree with infection on stem or live branch
- JS
- sanitation (but hard to see S&S at this age)
- remove all stem infections
- remove all infected even if it creates small voids
- however, if voids excessive
- do the best you can
- favour mix spp.
- steep slopes??
-
- DMH
- SI >22@50yr (richer sites)
- Regen as above +
- flat - mod. sloped ground ... clearcut w/ 3m knockdown
- Hw regen should 'out grow' the DMH
- JS as above +
- not too wide
- maintain dense stand near infected residual trees (↓ seeds)
- SI <22 @50yr (poorer sites)
- Regen as above +
- clearcut w/ 0.5m knockdown ... OR ...
- plant alt. spp. - Cw (Fd)
- JS as above +
- just say no (to drugs and spacing)
- DMP
- generally poorer sites & low LAI
- Regen
- clearcut w/ 0.5m knockdown
- along infected edges
- plant a "donut" of alt. spp.
- need to "maintain the donut" ...
- ... due to natural ingress
- or ...plant Pl, but slash a 30m strip when log adjacent
- JS
- "just say no"
- only space if
- required (= exceeds max density) and rating 0-2
- use wide spacing (6m)
- yes DMP will "rejuvenate" ...
- ... but Pl will benefit more from the wide spacing
