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Last Updated: Tuesday March 09 2010 13:28 GMT

Japanese critters fight UK weeds

Japanese knotweed

A tiny Japanese insect is heading to the UK to kill off a super-weed that ruins gardens and weakens buildings.

Since Japanese knotweed was introduced to the UK, it has spread really quickly. It's so strong it can even break through concrete.

The weed grows very quickly - more than one metre a month - and swamps any other plants in its path.

But in Japan, the weed is killed by little insects and scientists think they could help control it over here.

The teeny critters will be released in two top-secret areas in the Spring.

Experts are hoping the insects will spread across the UK. The knotweed costs councils and gardeners around £150 million each year to get rid of.