ORVIdetect Japanese Knotweed

Knotweed in the ground

Knotweed (Fallopia) is a special plant. It is a very strong usurper and does considerable damage. With roots that grow up to 3 meters deep and can demolish foundations. The three species that proliferate here in the Netherlands are Fallopia Japonica (Japanese Knotweed), Fallopia Sachalinensis (Sachaline Knotweed) and the Bohemian or Bastard Knotweed.

Is my soil Knotweed free?

The root system of the Japanese Knotweed is extensive and a small piece of root can grow into a plant. Orvion has developed a DNA analysis that determines the presence or absence of the three species of Knotweed. This analysis can be used for batch inspections or earthmoving. In this method, the organic material (hair roots, twigs, leaves) is analyzed from soil samples or directly, whereby it is determined on the basis of DNA whether it concerns Knotweed. Because the DNA technique is extremely sensitive, very small plant fragments of the Knotweed are also found.

National protocol dealing with Asian Knots

The DNA analysis is included in the National protocol for dealing with Asian Knotweed. During the development of the protocol, the DNA analysis on soil was successfully validated by means of a blind test. More information about the protocol, validation and sampling in the field or soil depot can be found athttps://bestrijdingduizendknoop.nl/

Sampling and analysis

We offer the following options:

  1. An analysis on Knotweed of a (mixed) sample of soil for a batch inspection or during an excavation. The analysis consists of a pre-treatment, analogous to an asbestos analysis, followed by a DNA analysis. The analysis time is 7 working days.
  2. Identification of root material, whereby root material is sent to our laboratory and we analyze whether it concerns Knotweed within 5 working days.

The report indicates whether Knotweed is present or not. The results are sent by email. If desired, we agree with you on the best sampling strategy in the field or for the soil depot. For more information or a quote, please contact us via the contact form or Marc van Bemmel.

Soil contamination

Ecology (eDNA)

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