Treating Knotweed With Herbicide

Japanese knotweed control comes in all shapes and sizes

, however although herbicide methods are though to be very effective, using them alone can take several years to eradicate your Japanese knotweed problem.

As herbicides are known to mainly rely on the presence of living Japanese knotweed foliage for them to be effective, the difference between the knotweed being in leaf or dormant is necessary when choosing a suitable herbicide for its control. Glyphosate, widely sold under brand names such as, Rodeo or Roundup, can be applied as a foliar spray directly onto the plant. The majority of herbicides however is not effective during the winter dormant stage, (and also depends on the amount of Japanese knotweed that needs to be treated) meaning the best time to apply it is ideally between July and September when the plant is in leaf.

Japanese knotweed cannot be eradicated by winter alone, like many other plants. As cold weather hits, the plant survives as an underground rhizome and through the autumn it then successfully lives on the food stores drawn from dying leaves and canes. It will take approximately around three years of treatment before the Japanese knotweed will be fully eradicated and by the third year of treatment, knotweed growth can still be easily overlooked amongst the grass and herbage in your garden or allotment. So be sure to keep an observant attitude to your green.

Consent and consultations may be required where applications of herbicides is adjacent or within 10 metres of water. These consents may also have a number of requirements relating to the plants removal, such as timing and location of the application. The mass spraying of chemicals is also likely to prompt concern about the impact on other plants and insects and the birds that feed on them. However if you require the need to make an application for approval, be sure to do this before the date of the Japanese treatment to therefore allow time for any consents to be granted.

There are a number of responsibilities on herbicide users in Japanese knotweed control and removal such as the plant protection Products Regulations 1997 and Statutory controls under the Control of Pesticides Regulations 1986. Furthermore, if you do not feel entirely confident with using herbicides, or do not possess the equipment or protective clothing to do it, it is highly recommended that a qualified gardener or eradication company specialising in knotweed should do the job for you.

by: Andre Issey

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