1000 Flowers for the Planet - #331 Use Pyrethrum in the Garden
Pyrethrum is made from a type of daisy flower and can help in the garden when you have certain pests you really need to be rid of. A word of caution is that commercial pyrethrum sprays may contain possible carcinogenic ingredients, so read the label carefully and know what you’re putting on your vegie plants etc. Make your own insect spray by soaking dried Dalmation daisy flowers for three hours and use the water as your insecticide within twelve hours.
Try to use this less harmful, but imperfect, garden solution as a last resort for getting rid of really difficult pests because pyrethrum is harmful to bees, wasps, beneficial insects and fish, so we don’t want it in our water systems. After spraying it on affected plants, cover those plants with a sheet or some form of row cover for 24 hours to prevent bees and good insects from coming into contact with the pyrethrum.
It may have its cautions but it's heaps better than using chemicals.