It is relatively nontoxic. Neem is made from seeds of the neem tree. The active ingredient is azadirachtin. It has a garlic-like odor and is relatively nontoxic. Neem stops insect feeding and interferes with shedding of their skin.
Pyrethrums give a fast knock down of pest insects and are broad spectrum.
There are no residues left on crops after spraying with this pesticide. It is a relatively nontoxic, broad spectrum product sometimes found in products containing rotenone. Rotenone stops insect feeding and is broad spectrum in action. It leaves no residue on crops and lasts only 3 days once applied to vegetables. Rotenone is very toxic to fish.