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                | I just mark on the leaf roughly where the 
                              whitefly is, and very carefully punch out a circle 
                              from the leaf disk. Then I check to make sure the 
                              fly is still there and transfer the sample into 
                              an individual vial.
                 
                  Andrew 
                              Polaszek
                 
                 , Entomologist, Natural History Museum, 
                              London
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