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United States Department of Agriculture

Agricultural Research Service

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Image Number K8797-4

In quarantine tests, potential biological control agents are confined in small cages with a test plant (Scotch thistle, in this case) to confirm whether they will feed and reproduce on that plant.

Photo by Keith Weller.

640 pixels wide: (k8797-4.jpg)

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Last Modified: 8/13/2016
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