These tests are conducted in the country where the potential insect agent occurs, i.e. in the country of origin or a country of previous introduction. The control plant and test plants are placed in the field where populations of the insect occur. The test allows the insect to express its natural behaviour. However, it may be difficult to achieve high insect densities. Studies using open field tests are reviewed by Clement and Cristofaro (1995).

An example of an open field test.

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