An analysis of the effectiveness of crop spraying in South Vietnam in terms of its impact on Viet Cong rice rations. Viet Cong rice consumption varies in remarkably close relationship with the economic characteristics of a region and its distance from the Laotian or Cambodian border. It is influenced minimally, if at all, by crop spraying. On the other hand, losses incurred by the civilian population are considerable: It is estimated that over 500 civilians experience crop loss for every ton of rice denied the Viet Cong. In terms of denying food to the Viet Cong, the returns of the crop destruction program are so limited as to suggest that the program be taken under serious review.