It's been affecting organic growers the most because they can't use most of the conventional remedies against it. That doesn't mean it isn't CAUSED by monoculture.
If I may toss in a further point of confusion, organic ≠ ~monocultured. Most organic produce in supermarkets is grown in an environment very similar to that of non-organic produce, the only differences being chemical. Small farms that maintain crop diversity are not the norm even within the organic sector.
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