These are natural pesticides. They do not pollute the soil and are immune to getting resistant. For example: – strong smelling aromatic plants and their extracts like sweet basil, Mexican Marry Gold are used to control insects and fungi. Chilies can be used against insects, fungi, bacteria and viruses. Sun-hemp is used against insects, nematodes and fungi. Onion can be used against aphid, caterpillars and mites. Wood ash and Bead tree are used against soft-bodied insects fungi.