What is it about?

In 2016 we completed the world’s largest Japanese knotweed field-trial after 5 years of research. We defined a new patent pending approach to Japanese knotweed treatment; The 4-Stage Model. This model links control method selection and application with the seasonal surface-rhizome flows in the knotweed plant.

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Why is it important?

Seasonal targeting of Japanese knotweed treatment using the right control method provides more effective treatment outcomes, using lower doses of herbicide across the whole management life cycle. This means more affordable treatment, which is also more environmentally friendly than traditional blanket application of herbicides and ineffective application of carbon intensive physical control methods.


We began focusing on controlling Japanese knotweed at a time when there was a great deal of hysteria surrounding it, particularly in the UK. At the time, most information for people affected by the plant was largely based on anecdote. This led to the prospect of unscrupulous companies offering expensive and ineffective treatment options to homeowners. Additionally, large stakeholders were undertaking treatments that did not work, or worse, spread the plant further, creating greater problems and costing more money downstream. In short, it was quite incredible to us that there was no long-term, large-scale field trial analysis of the treatment methods used to control Japanese knotweed.

Dr Daniel Jones
Swansea University

Read the Original

This page is a summary of: Optimising physiochemical control of invasive Japanese knotweed, Biological Invasions, April 2018, Springer Science + Business Media,
DOI: 10.1007/s10530-018-1684-5.
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