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United States Department of Agriculture

Agricultural Research Service

ARS Photo Library

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Image Number K9655-1

Ecologist Ray Carruthers measures plant and flower head density of yellow starthistle while technician Justin Weber uses a sweep net to sample populations of biocontrol agent Chaetorellia succinea.

Photo by Peggy Greb.



640 pixels wide: (k9655-1.jpg)




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Last Modified: 5/23/2006
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