Japanese knotweed and other invasive species cost UK ?4bn a year, research suggests

Ash dieback most expensive, while cost of tackling alien species has more than doubled since 2010, says studyFrom Japanese knotweed to a fungus that kills ash trees, tackling invasive non-native species now costs the UK economy about ?4bn, up from ?1.7bn in 2010, research suggests.There are about 2,000 invasive non-native species (Inns) in the UK, and about 12 new ones establish themselves each year, adding, along with inflation, to the rise in costs. Continue reading...