Assertion: clematis | /r/CapableOf | become to such an extent
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Source sentences:
text: However because 'Jackmanii' was bred from C. lanuginosa (a species which is susceptible to the pathogen which causes the disease), and because 'Jackmanii' led to a series of similar hybrids and the popularisation of the genus, clematis wilt soon became a serious problem for the new Clematis nurseries, to such an extent that by 1880 it had "brought the industry to a halt".