Aphid outbreak threatens up to one-third of Britain's lettuce harvest

A severe aphid outbreak is sweeping Britain's lettuce-producing regions, with the British Leafy Salads Association describing it as the worst in a quarter of a century. The currant-lettuce aphid is damaging crisphead, romaine and iceberg lettuce, especially bright-green varieties, and could destroy up to one-third of the national crop before the season ends in mid-autumn. An East Anglian grower forecasts a loss of three million heads, costing roughly £1 million.

Hot, dry weather this summer has created ideal conditions for the pest, and the earlier ban on neonicotinoid insecticides has left farmers with few effective treatments. Research into resistant lettuce strains is under way, but rapid aphid reproduction and evolving resistance pose ongoing challenges. The crisis adds to broader agricultural stresses, including drought-hit potatoes and pumpkins and heightened bluetongue risk to livestock.