Scientists investigate stink bug threat

Published Monday, 7th October 2019 in Research news

The Brown Marmorated Stink Bug wreaks havoc on a wide range of crops
The Brown Marmorated Stink Bug wreaks havoc on a wide range of crops

Scientists are investigating whether a stink bug which wreaks havoc on a wide range of crops could establish itself in Scotland.

The Brown Marmorated Stink Bug originates from East Asia but spread to the USA in the late 1990s after hitching a lift on packing crates.

The insect, which gets its name from the pungent smell it releases when threatened, has since been found in parts of Europe, including Germany, Switzerland and Italy, and also in Russia and Georgia.

Now researchers from Scotland’s Rural College (SRUC), the James Hutton Institute and SASA (Science & Advice for Scottish Agriculture), are investigating whether it has already landed in Scotland – and if so, whether it could establish itself here in the long-term.

They have placed sex pheromone traps at strategic points around the country, including near Edinburgh Airport and in soft fruit growing areas, to attract the bug if it is already here.

Researchers at the James Hutton Institute and SASA are also developing DNA barcoding to help distinguish the Brown Marmorated Stink Bug from similar, less damaging species.

Dr Andy Evans, a pest management expert with SRUC’s Crop and Soils Systems research team, is using climatic models to see if the Scottish climate is conducive to the survival of the species, both now and in future climate scenarios up to 2080.

In addition, he will collect data from inside polythene tunnels to see if the higher temperatures and humidity in these protected environments would enable stink bugs to reproduce if they managed to get inside.

Dr Evans said: “From a Scottish perspective, it was the soft fruit industry that raised concerns about this insect, first for the damage it can cause to crops, but also the impact it could have on exports.

“Previous data suggests it couldn’t reproduce outdoors in Scotland. The insects need a certain period of warm temperatures to complete their lifecycle and in an outdoor situation in Scotland, there are probably not enough days of high enough temperatures for it to do so.

“Inside a polythene tunnel the temperatures can be very warm and if it does come into the country and finds its way into protected crops of raspberries or strawberries, there’s a risk it could keep itself ticking over. However, until we have looked at the data we don’t know.”

Following the completion of the project at the end of November, the researchers will produce maps highlighting areas at risk for future monitoring.

“There’s monitoring going on in England at the moment but they haven’t found it yet,” said Dr Evans. “However, there’s always a risk someone could bring plant material into the country from an affected area which is why we have traps near airports.”

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