Scientists have learned that cabbage and cauliflower crops could potentially be "devastated" by a species of moth arriving from continental Europe.
BBC News understands that tens of millions of diamondback moths are thought to have come to the UK in the past week.
This is 100 times the number that arrive in the entire year.
Researchers describe the species as a "super pest" because it is thought to be resistant to several insecticides.
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