Tobacco is ground up to make a natural insecticide.
Leaves have been used as a natural insecticide to keep with stored food, but must not be eaten as they are highly poisonous.
In general, tree rosin is considered a natural insecticide.
Extracts of Quassia wood or bark act as a natural insecticide.
There is also research indicating that the oil can be used as a natural insecticide.
Pyrethrum is a natural insecticide and the County is one of the most important production areas in the world.
Extracts from the wood are also used as a natural insecticide in organic farming.
The Indian meal moth has been found to develop resistance to new kinds of "natural" insecticides in just a few generations.
Over time, evolution has favored those plants having the natural protective insecticide.
IN Maryland, crab shells are being turned into a natural insecticide.