Genetic diversity
Agrobiodiversity contributes to pest control by: (a) providing a habitat for pests' natural enemies to live and breed in; (b) providing wide genetic diversity which means it is more likely that genes contain resistance to any given pathogen or pest, and also that the plant can evolve as pests and diseases evolve. Genetic diversity also means that some crops grow earlier or later, or in wetter or drier conditions, so the crop might avoid attacks from the pest or pathogen.