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Smells are bugging the bugs.

PUZZLING a plant pest could help gardeners save their crops from damage, North East biologists have found.

The team at Newcastle University have been concentrating on whitefly, which attack greenhouse crops like tomatoes and leafy allotment plants such as cabbage and sprouts.

But the Newcastle experts have shown that bombarding the pests with smells from many different plants temporarily confuses them and hinders their ability to feed.

They have been exploring the potential of harmless plant scents as an alternative to pesticides in greenhouses.

Testing a phenomenon known as the "confusion effect" - whereby animals and humans become inefficient at a task when they are bombarded with lots of distracting information - the team pumped a mixture of plant smells into a greenhouse growing tomato plants.

Exposing the whitefly to a heady aroma of cucumber, courgette, watercress, watermelon, cabbage and beans, the team found the insects became temporarily disorientated.

Like other insect pests, whitefly feed by pushing their long mouthpiece into the leaf until it reaches the plant's main source of nutrients.

Weaving their way between the plant cells to reach the sap is technically challenging and the team found the whitefly failed to feed while they were being bombarded with the dif-f ferent plant chemicals.

Researchers Dr Colin Tosh and Dr Barry Brogan said the breakthrough could be an important step towards a more sustainable method of pest control.

"It's like trying to concentrate on work while the TV's on and the radio's blaring out and someone's talking to you," said Dr Tosh, based in Newcastle University's School of Biology. "You can't do it - or at least not properly or efficiently - and it's the same for the whitefly.

"Whitefly use their sense of smell to locate tomato plants. By bombarding its senses with a range of different smells we create sensory confusion and the result is that the insect disorientated ble to feed. use the is tempo-- we saw it no more an 15 hours - it's unlikely is method one could be ed to conl crop pests. But this is an and safe f buying the time until n chemical hanisms kick in. Used in conjunction with other methods, sensory confusion opens up a whole new area in sustainable pest control."

Whitefly is a major worldwide pest of greenhouse crops and is traditionally controlled using chemical pesticides or biological methods such as parasites.

Previous studies have shown that whitefly become restless when a number of plant species are mixed together rather than being exposed to a single crop.

The aim of this latest research, funded by the Natural Environment Research Council, was to artificially create this mixed environment for a single crop greenhouse.

Measuring the time it took from the insect settling on a plant to accessing the plant sap, the team showed that hardly any of the whitefly exposed to a range of smells started feeding within 15 hours from the time of exposure.

By comparison, the majority of whitefly exposed to just the single smell released by the tomato plants started feeding within this time.

Dr Brogan, also based in the School of Biology, said: "Plants talk to each other when they are under attack, producing chemicals which warn other plants close by of the threat. At the same time, they produce a chemical which is unpleasant to the predator.

"But this response doesn't happen immediately, so if we can confuse the insects long enough to give the plants time to defend themselves this may go some way to reducing crop losses."

The team has now started the next phase of the study to investigate ways of helping plants to talk to each other and better switch on their defences.

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Publication:The Journal (Newcastle, England)
Date:Apr 30, 2014
Words:614
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