FIGURE 6-2 Qualitative pest risk-assessment procedure used by USDA/APHIS (1997). Risk potential (A) is based on joint consideration (addition) of likelihood of introduction and consequences of introduction. Likelihood of introduction (B) is based on quantity of imported material and qualitative assessment of the likelihood that nonindigenous species will survive or find suitable host or habitat. Consequences of introduction (C) are based on qualitative assessments of climate-matching, pest host range and dispersal, and economic and environmental impacts.

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