a swarm about 2 miles wide was spotted near leominster,herefordshire by a motorists .farmers fear that the diamondback will wipe out cauliflower and cabbage crops.diamondbacks are believed to have originated in europe but were spotted in america in 1854 .it has a wingspan of 15 mm ,body length of 6 mm and was first insect to prove resistant to pesticide bt toxin.
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