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A number of seed, leaf, and stem gall nematodes are of significance to the forage and landscape grass and livestock industries. In North America, the bentgrass nematode, Anguina agrostis, reduces seed production on Agrostis tenuis and several other grass species. Anguina funesta is a seed-gall nematode that is most significant for its association with the toxigenic bacteria Rathayibacter toxicus. The wheat seed gall nematode A. tritici causes significant damage to wheat and other cereals; although it has been found in many countries worldwide, it has not been detected in the United States since 1975. Molecular methods based upon sequence variation in the ribosomal internal spacer region are useful for accurate identification of Anguina spp. Described herein are new species-specific primers and TaqMan probes for real-time polymerase chain reaction (PCR) identification of A. agrostis, A. funesta, A. tritici, and A. pacificae. Primer and probe combinations were each specific for the intended species and were sensitive enough to detect as few as 1.25 copies of nematode ribosomal DNA. PCR was also specific and sensitive in duplex assays that included genus-specific internal control primers as well as species-specific primers and probes. These standardized real-time PCR protocols should facilitate fast and accurate identification of Anguina spp. by diagnostic laboratories.

Real-Time PCR for Detection and Identification of Anguina funesta, A. agrostis, A. tritici, and A. pacificae