In summer and autumn, the soon-to-open pyrethrum flowers are picked, dried in the shade, ground into powder, and sieved by 120- 150 mesh. Adding 200-300 times of water to each catty of pyrethrum powder, adding soap as appropriate to make suspending agent, and spraying after stirring evenly can prevent and control various pests in agriculture. Even if the whole pyrethrum is soaked in 20 times of water, it has a good control effect.
Poisonous derris
External use can kill insects, relieve itching, eliminate dampness and relieve arthralgia.
It should not be taken orally.
Prescription ① for the treatment of wandering arthritis: (poison) Derris Five Money, South Fairy (imported variety) appropriate amount.
* * * After grinding, soak the (toxic) derris in a cup of boiling water, then add the fairy powder to make a paste and apply it to the affected area. (2) Treatment of dampness: (poison) 22 pieces of derris and 42 pieces of white vinegar. Take the medicine in water once a day for two days.