Abstract
Phytophthora fragariae Hickman, which causes strawberry red stele and raspberry root rot, is a quarantine organism for which specific and sensitive detection methods are required to test the health of planting material. Sequences of the internal transcribed spacer regions of the ribosomal gene repeat (rDNA) were used to develop primers for P. fragariae in a nested Polymerase Chain Reaction (PCR). The fungus was readily detected in infected but symptomless roots by nested, but not single-round, PCR. It was also detected in infested water samples obtained from the Dutch General Inspection Service by nested PCR. Detection of PCR products was at least 10-fold more sensitive by PCR-ELISA than by conventional visualisation on agarose gels.
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