‘The Flowers of Painted Lady’ plants contain an insecticidal element, pysellethein, which is the main ingredient used in mosquito repellent coils and mats. Just about 2 to 4 microorgams of this element is enough to kill a mosquito. Lesser doses of this paralyses them. However, pysellethein does not affect the warm-blooded species. An average mat or coil contains only 40 microorgams of pysellethein, all of which is not emitted at the same time on burning the repellents. It mixes with the air gradually over a long period.
- They are made of a substance which causes heart burn for mosquitoes.