File:Soll 2004 controlling knotweed in pacific northwest.pdf

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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.