The following plant-based products are used to kill/repel insects and mammals, alone or in combination with others. Most do not work as quickly as synthetic pesticides but are nowhere near as toxic to the enviroment.
1) Boric Acid
2) Canola Oil
3) Castor Oil
4) Cedar Oil
5) Clove Oil
6) Diatomaceous Earth
7) Hot Pepper
8) Lemon Juice
9) Neem
10) Orange Peel
11) Peppermint Oil
12) Rosemary
13) Sabadilla