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Poisonous plants cause serious economic losses in many areas of the West. However, there is no systematic way of accounting for the magnitude of these losses. A significant proportion of the poisonous plant loss is reflected in annual death loss in livestock and in calf and lamb crop percentages. By concentrating one's effort on the effect of poisonous plants on these measures, one should be in a better position to make reasonable estimates of the economic costs of poisonous plants. Other losses from poisonous plants should be considered as data become available. Based on the assumptions outlined, the economic loss in the 17 western states is about $107 million annually. Poisonous plants have the potential on many ranches of causing financial ruin to the business. It has been shown that poisonous plants can be economically controlled and losses kept at manageable levels. This material was digitized as part of a cooperative project between the Society for Range Management and the University of Arizona Libraries. The Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information. Migrated from OJS platform August 2020