Watkins was correct in predicting that harvested fruits and vegetables would be larger in the future. The widespread use of pesticides in the produce farming and the advent of genetically-modified fruits and vegetables in the 1980s and 90s have put oversized fruits on the market.
Tom Geoghegan. "Ten 100-year predictions that came true", BBC News Magazine. 11 Jan 2012. http://www.bbc.co.uk/news/magazine-16444966