Mepụta ụdị ahịrịokwu a dị mgbagwoju anya Ụdị a bụbu ihe a na-ahụkarị n'akụkụ ka ukwuu nke South West England, Southern Ireland na Brittany tupu ọbịbịa nke Dutch elm ọrịa, nke bibiri osisi osisi.
N'ezie, ụdị ahịrịokwu dị mgbagwoju anya bụ "Ụdị a bụbu ihe a na-ahụkarị n'ọtụtụ ebe na South West England, Southern Ireland na Brittany tupu ọbịbịa nke ọrịa Dutch elm, nke bibiri osisi osisi n'ofe Europe na 1960 na 1970s. "