Leicester research paves way for first use in Europe of an insect to fight inva...( Researchers at the University of Lei...)

Researchers at the University of Leicester have paved the way for the first ever use in Europe of an insect (biocontrol) to combat an invasive plant species in Britain.

University of Leicester biologists established that the Japanese Knotweed in Britain was one the biggest females in the world- a clone of cuttings brought into Britain in the 1850s. Costs of controlling it in Britain have been put at 1.5 billion.

Defra's Food and Environment Research Agency (Fera) has now launched a public consultation exercise into plans to control the Japanese Knotweed using a highly specialist sap-sucking insect or psyllid- called Aphalara itadori.

This follows a rigorous testing regime undertaken by the not-for-profit research organisation CABI at their quarantine laboratories, the purpose of which is to be as sure as possible that potential biocontrol organisms are restricted to Japanese Knotweed and cannot be tempted to stray onto related British plants or economically important species.

Lead scientist Dick Shaw said: "Using information compiled by scientists at the University of Leicester, Biocontrol experts at CABI were able to focus their collecting efforts on the precise region of Japan where the European clone of Japanese Knotweed originated.

"A number of Japanese invertebrates and micro organisms have been subjected to a rigorous testing regime. The aim of biological control is not to eradicate the target organism, but to weaken it so as to restrict spread and increase the effectiveness of other control measures (i.e less herbicide use)."

The psyllid doesn't actually eat the plant, but sucks the sap like an aphid, and also produces vast numbers of offspring on Japanese Knotweed plants, which severely affect the morphology and vigour of the plant.

Dr Shaw added: "Since there has never been a release of a biocontrol agent for a plant species in Europe, extreme caution is being exercised by all concern
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