I think the point is not that European production could not be seriously hampered, but that these threats happen more often than we tend to realise. As a side

I think the point is not that European production could not be seriously hampered, but that these threats happen more often than we tend to realise. As a side comment: Xylella fastidiosa is worse than Tuta absoluta in terms of the time frame, but olive oil trees (as another comment has mentioned) are much quicker to re-establish with modern farming techniques. Avocado trees were once considered to be productive if they are really big, but the current knowledge is the smaller they are the better—with heights of as small as 2m and spacing of 2.5m x 6m. Edit: "Much quicker" can still be a long time. With date palms, you are looking at a 15 year investment before you get high enough yields for positive cashflow.