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I used to live in Hampton, Middlesex, in the south of England. We grew blackberries and I don’t remember ever seeing any of the picked fruit grow mildew. But where I live now in semi-rural Nottinghamshire, in central England, blackberries will grow mildew within an hour of picking. Similarly, sliced bread – even when stored in the fridge – grows mould after a day or so. Can anybody explain why there is a difference? Although I know that mildew growth on roof tiles can be affected by airborne pollution, neither of these locations is subject to recognisable pollution that might have affected the growth of mildew…