Pocket Guide to Balsam Bashing

In recent years, we've all become more familiar with the idea of invasive species. Plants and animals as varied as giant hogweed, the mink and oak processionary moths regularly make headlines because of the health, environmental and economic problems they cause. Invasive deer contribute to more than 74,000 traffic accidents in the UK every year, while Japanese knotweed added £70m to the bill for staging the London Olympics, and could soon stop you getting a mortgage on your house. These invasive