Researcher Martha Koukidou in the olive fly 'rearing room' at Oxitec
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How to rear genetically modified flies

20 November 2013 Last updated at 10:00 GMT

A UK biotechnology company has applied for permission to carry out the first field trial in Europe of a genetically modified insect.

If it receives approval, the company, Oxitec, will carry out a small-scale test of GM olive flies in Spain.

The aim is to combat this olive crop pest by releasing male flies that have a "female-killing gene". If the GM flies can outbreed the wild flies, the female offspring will die - reducing the olive fly population.

Here, scientist Martha Koukidou from Oxitec explains how the company rears the GM flies to prepare for Spanish trials.

Video journalist: Victoria Gill