Different plant species products were used as natural insecticides. For example Azadirachta, Chrysanthemum, Allium sativum etc. The amount of secondary metabolites in question may vary from species to species or in different parts of the same plant species.
There are many plant extracts can be act as botanical insecticides .Of these are chrysenthemum ,tobacco,neem ,rotinone and many others.The toxic materials can be in the different parts of the plants .In case of chrysenthemum,the pyrethrins ,cenerin and jasmolines as toxic compounds are concentrated in flowers more than any part of the plant .These extracted toxic materials are highly toxic to insects and with low mammalian toxicity .