A statistical survey conducted on archaeological materials recovered from various sites drawn from both the north and south regions of Peru would give us some indication of areas where the crops were subjected to differential pest and disease pressures. References Bender, B. 1975. Farming in Prehistory. Bonavia, D. 1984. Cohen, M. N. 1978.
Archaeological plant remains from the central coast of Peru.
Dillehay, T. D. and M. B. Collins. Early cultural evidence from Monte Verde in Chile. Engel, F. A. 1970. Explorations of the Chilca Canyon, Peru. Guidon, N. and G. Delibrias.