of target DNA (100, 10 and 1 pg per PCR assay).PCR with the specific primer set F49/R502
resulted in a visible 472 bp product in all spiked DNA samples, irrespective of soil type and extraction method (data not shown). Hence, the extended procedure was a necessary amendment for the PCR method although sensitivity may be reduced due to DNA losses on the PVPP column and a 10-fold dilution step