You probably know the story by now: a precocious Amish teenager named John Kempf was managing his family’s vegetable farm when he noticed something strange. A clear line demarcated two fields:
- one was ravaged by mildew
- the other, right next to it, was fairly healthy.
The infected field had a history of heavy fungicide use, while the clean field had been converted just that year to vegetable production from pasture.
Strangely, fungicides had not killed the fungi, but had actually made disease worse.
This “Aha moment” set John off on a quest that overturned all the conventional wisdom he had inherited.
In his pursuit of understanding, John cold-called professors, showed up on the doorsteps of plant pathology experts across the country, and asked his local librarian to request transatlantic inter-library loans of out-of-print textbooks from German research universities.
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