Japanese Knotweed Treatment

Part of our Japanese Knotweed Removal Guide. Click to see more answers to your questions.

Herbicide – Spray

• Has to be conducted by a suitably qualified sprayer operator.
• All regulations and conditions of herbicide have to be adhered to.
• Follow up spraying may be required.

Herbicide – Stem Injection

• Has to be conducted by a suitably qualified sprayer operator.
• All regulations and conditions of herbicide have to be adhered to.
• Uses a highly concentrated dose.
• Suitable for small areas / targeted treatment.

Herbicide – Weed Wiping

• Has to be conducted by a suitably qualified sprayer operator.
• All regulations and conditions of herbicide have to be adhered to.
• Uses a highly concentrated dose.
• Suitable for small areas / targeted treatment.

Excavation

• Provide faster results than herbicide spraying.
• Large amounts of waste generated due to roots and soil being excavated.
• Waste to be treated on site unless transported to a licensed disposal site by a licensed waste carrier.
• All waste transfers need to be recorded on consignment notes.
• If subsequently bunded and treated treatment times can be greatly reduced from in-situ treatment.

Burning

• Controlled burning done on the same site where it was produced.
• An environmental permit may be required.
• Burning not to exceed 10 tonnes over a 14 hour period.
• Residual ash can be spread over the area of excavation or buried.

Burying

• Burying must be done with the proviso of the Environmental Agency.
• Can be done within a purpose built cell lined with an anti-plant membrane at a depth greater than 2m.
• If buried without a membrane the cell has to be at a depth greater than 5m.
• Burying plant material must not interfere with the groundwater.