Aphid outbreak in the UK threatens industry with over $13 million in losses

A lettuce aphid (Nasonovia ribisnigri) outbreak at the end of the growing season in the United Kingdom is estimated to destroy around 30 million heads of lettuce, according to the British Leafy Salad Association (BLSA). 

A spokesperson for the organization told the local newspaper The Telegraph that this is “the worst aphid infestation in 25 years,” and is projected to result in financial losses of up to £10 million ($13.3 million). A mild winter and a warm, dry summer created ideal conditions for the proliferation of the insect, which kills lettuces by feeding on vital nutrients for the plant. 

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The infestation comes at the end of the growing season and in the middle of the local marketing window, which is usually set to last until mid-fall, when imports start hitting UK shelves. According to the BBC, the outbreak is expected to kickstart international shipments by about two weeks early this year. 

The hardest-hit areas are the Midlands, East Anglia, as well as the south-east, the south, and the north-west. Green lettuces are more at risk of aphids compared to purple ones, with Crisphead, Romaine, and Iceberg as the worst-hit varieties, according to specialized media outlet Hortidaily.

Lettuce aphid: A sturdy and dangerous pest

In conversation with BBC Radio 5 Live, BLSA spokesman Dieter Lloyd labeled the situation as “serious,” but noted that the outbreak is not affecting all lettuce production in the region. 

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Aphids have long been a problem for leafy green growers worldwide. Producers usually manage the pest by spraying neonicotinoids, an insecticide banned in the European Union in 2013 for its deadly effects on honeybees. 

This shift has pushed the industry to look at the development of aphid-resistant cultivars as the best solution. However, curbing the insect’s population with this approach has proven particularly challenging, as aphids can reproduce without mating and adapt quickly to adverse conditions. 

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The UK consumes 200,000 metric tons of lettuce each year, with half of it imported. Local growers account for half a billion heads each year. 

*All images are referential. 

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