PEST RISK ANALYSIS (PRA) TRAINING Group Exercises Manual

GROUP EXERCISE NO. 3.1
PEST RISK ANALYSIS TRAINING - GROUP EXERCISES MANUAL
Part 3 – Pest Risk Assessment, Probability of Entry
Pest introduction is comprised of both entry and establishment. Assessing the
probability of introduction requires an analysis of each of the pathways with which a
pest may be associated from its origin to its establishment in the PRA area.
A) Identification of pathways (20 minutes)
The probability of entry of a pest depends on the pathways from the exporting
country to the PRA area. Their variety, frequency, volume, destination and end-use,
and the frequency and quantity of pests associated with each influences the likelihood
of the pest entering the PRA area.
The greater the volume and frequency of pathways, the greater the probability of the
pest entering the PRA area will be. A good understanding and description of the
pathway(s) that a pest or pests may move on contributes to an accurate PRA.
Describe all of the pathways the pest could be carried on:
Documented pathways for the pest to enter new areas should be noted. Potential
pathways, which may not currently exist, but are feasible future pathways, should
be assessed. Pest interception data may provide evidence of the ability of a pest to be
associated with a pathway and to survive in transport or storage.
B) Evaluation of pathways (1 hour)
Each of the pathways identified above should be evaluated in turn, to determine the
likelihood that the pest will be associated with it. For each pathway identified, answer
the following questions:
1. Probability of the pest being associated with the pathway at origin
• Does the pest occur in the source area? What is its prevalence?
• Does the pest occur in a life-stage that would be associated with commodities,
containers, or conveyances? Do seeds, germ cells, spores or other propagules
have access to commodities, containers or conveyances?
• Is seasonal timing appropriate for the pest to be associated with the pathway
at origin?
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