Soll 2004 controlling knotweed in pacific northwest
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Soll, Jonathan. 2004. Controlling Knotweed (Polygonum cuspidatum, P. sachalinense, P. polystachyum and hybrids) in the Pacific Northwest. The Nature Conservacy. pp. 15.
Notes[edit]
- Indicates that stems may root if in water or if in moist sediment.
- Likely origin of the "cut every 2 weeks" claim by subsequent authors such as King County and others.
- Suggests that hybridization between species creates high chances of viable seed production, and that TNC in Oregon sprouted seed under controlled conditions.
- If herbicide treatments are too concentrated, damage to leaf tissue may prevent translocation to roots.
- Pulling or digging may be more effective than cutting, but produces roots which are more difficult to dispose of.
- Reports on Lummi experiment to till, cover with cardboard on 1/4 acre plots resulting in only 80% stem reduction at a cost of $32k/acre.
- Reported failure of 6 week covering in spring.
- Reports that goats may eat knotweed and offer alternative to mowing.
- Suggests that tilling may support subsequent spray effectiveness by increasing shoot to root ratio. (but this increases risk of transporting roots Pcereghino (talk)).
- Suggests that cutting or pulling may increase shoots and thereby improve herbicide performance.
- Sticker/Spreader specifications may strongly effect performance.
- Glyphosate, Triclopyr, 2,4-D, Imazapyr and Picloram have all been considered.
- Field experiments in 2004 were achieving 50% area eradication with 2-4 applications over 2 years of Glyphosate or Triclopyr.
- While injection achieves higher control, follow up foliar spray is almost always required, thereby reducing the initial high labor cost of injection.
