Japanese Knotweed Quiz (How well do you know this Invasive Plant Species)

How many different species of Knotweed is found in Ireland & UK

5, Japanese Knotweed, Hybrid Knotweed, Giant Knotweed, Himalayan Knotweed and a Postrate/drawf Knotweed

3, Japanese Knotweed, Hybrid Knotweed, and Giant Knotweed

What are the main characteristics of Japanese Knotweed

Purple specks on stem, Zig - Zag pattern on branch/upper stems, Shield shaped alternate leaves

Purple specks on stems, Shield shaped opposite leaves, Zig - Zag pattern on upper stems

How do you tell the differance between Japanese, Hybrid and Giant Knotweed

Hybrid and Giant Knotweed species have smaller stem diameter to Japanese Knotweed

You can tell the differance by the size & colour of the rhizomes

Leaf and stem type helps identify the different species

Using a microscope on the underside of the leaves to note presence/absence & size of hairs

Show Best Practice for Herbicide application near waterways

Plants greater than 20 m away from waterways should be stem injected

Plants growing in the water should be controled by using a foliar application

Plants 20m and nearer should be stem injected with persistant Herbicide application

Plant within 20m of riparian zones should be stem injected

In the second year of Herbicide application show Best Practice

Plants should be treated with Glyphosate as soon as they appear

Plants should be treated with translocated Herbicide at 1 - 1.5 m high

Plants should be cut at second node and left to apply Herbicide at later date

What steps should developers take when first sighting of Knotweed is recorded on site

Immediately cut plants and scrape back topsoil

Cordon plants off with barrier tape and call in landscaper for advice

Cordon off plants with barrier tape, alert all staff not to disturb plant and call in Knotweed Control expert

Which Knotweed company is regarded by many to be the main experts in Knotweed eradication in Southern Ireland?

Www.KnotweedControlIreland.ie

Knotweed Solutions LTD.

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