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News Distribution Service (National): Invasive non-native species cost billions

Issued by the News Distribution Service on behalf of the Scottish Government.

Early eradication lessens financial impact

The financial cost of non-native species has been unveiled in a new report today.

'The Economic Cost of Invasive Non-Native Species to the British Economy' suggests that invasive species cost £1.7 billion every year and £251 million in Scotland.

The research was carried out by international scientific organisation CABI for the Scottish Government, Defra and the Welsh Assembly Government and it breaks down the effect on each country as follows:

* £1.3 billion per annum to the English economy,
* £251 million to the Scottish economy
* £133 million to the Welsh economy.

It indicates that the economic cost of INNS can be wide ranging and can result in the loss of crops, ecosystems and livelihoods. The cost to the agriculture and horticulture sector alone is estimated to be £1 billion across Britain.

The effect of the extent of the invasion on control costs was investigated in five case studies (Asian long-horned beetle, carpet sea squirt, water primrose, grey squirrel and coypu). In all examples, early action provided a significant economic benefit compared to the cost of management if the species were to become more widely established.

For example, with water primrose, a group of South American aquatic weeds which grow rapidly and can block waterways it is estimated that the current timely eradication will cost £73, 000 which is significantly less than the estimated £242 million that it would cost if the plant was to become widely established as it has on the continent in countries like France and Belgium.

Roseanna Cunningham, Scottish Government Minister for Environment and Climate Change said:

"We all know about the serious threat to our native wildlife from invasive non-native species, and this report confirms the huge cost to businesses and individuals in Great Britain every year."

"A better understanding of the negative impacts of invasive non-native species can help us raise awareness to help prevent introductions in the first place and to better respond to problems.

"This report highlights that once established, invasive non-native plants and animals can have a serious impact and that early intervention not only has a beneficial effect on the environment but also on our finances."

Richard Benyon, Minister for the Natural Environment, Defra, said:

"Invasive non-native species have a significant impact on the British economy and damage our own wildlife. The costs of controlling these species will rise unless society takes steps to prevent them taking hold and spreading.

"It becomes increasingly difficult and costly to control invasive non-native species as they become more established. Taking early action may seem expensive, but this report shows that it is the most effective approach, saving money in the long run and helping our native wildlife to thrive."

Jane Davidson, Minister for Environment, Sustainability and Housing, Welsh Assembly Government said:

"We in the Welsh Assembly Government are committed to protecting and enhancing our biodiversity and to understanding its relationship with, and impact on, our economy. We have been particularly concerned about the impact of non native species on our environment and on businesses in Wales.

"This report will help us to prioritise and target where actions can have the most impact, and will assist us in prioritising our resources for action in the future."


A document outlining the headline figures from the report and the full report itself can be found here:

This report was jointly funded by Defra, the Scottish Government and the Welsh Assembly Government and was written by CABI (see

Various methods were used to secure data for economic estimations. References of relevance to over 500 non-native species were gathered from the scientific and grey literature as well as the internet. A detailed questionnaire was sent to key organisations primarily to develop contacts but also to gather initial information. The collected information was used to estimate the costs, partially based on calculations for individual species, which was anonymously reviewed by over 30 selected experts from the sectors.

The top 20 non-native species inflicting the highest annual direct costs to the British economy are:

To view the word doc version of this release which includes a table showing top 20 non-native species inflicting the highest annual direct costs to the British economy, please follow the link below;


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  • Government


  • news distribution service(national)
  • non-native species
  • financial cost