I have a couple of comments about your citation:
- This looks to be for the “Natural insecticide pyrethrum” not the ‘synthetic’ versions found more ubiquitously for purchase. I suspect the natural pyrethrum is used in ‘natural’ products and for organic farmers.
- Pyrethrins are extremely safe for mammals (except cats), and any health issues are primarily due to excessive exposure. The flower pickers are not exposed to the levels that cause problems.
3.From your cite, it looks like this resource is highly valued by the farmers and not viewed on as a detriment to their health and economy. There is no mention of harm due to exposure to the flowers.