Chrysanthemum Flower Tea...

"...These flowers hold a powerful plant chemical component called pyrethrum. This substance invades the nervous system of insects rendering them immobile. You can make your own spray by boiling 100 grams of dried flowers into 1 liter of water. Boil dried flowers in water for twenty minutes. Strain, cool and place in a spray bottle. Can be stored for up to two months. You can also add some organic neem oil to enhance the effectiveness..."

http://www.globalhealingcenter.com/natural-health/organic-pesticides/

Anyone ever tried this?...

I've messed with this about 5 years ago. Never pursued it further. There are a number of plants that have similar properties that I worked with for a few months. I didn't like the results so I stopped testing everything.