A Comparative Analysis of Extraction Methods for the Recovery of Anguina sp. from Grass Seed Samples

J. A. Griesbach

Abstract


Four procedures were compared in their efficacy to extract juveniles of Anguina agrostis from commercial grass seed. The procedures included those currently used by the state regulatory laboratories of Oregon and California, as well as new tests developed to determine juvenile viability for the phytosanitary certification of fumigated grass seed. Eleven seed lots of Agrostis tenuis (bentgrass) and Dactylis glomerata (orchardgrass) naturally infested with varying levels of juveniles of Anguina were individually analyzed. Only one procedure, a new live recovery test, yielded nematodes in all 11 samples and is recommended as the best method for use by regulatory agencies. In comparison, although the other three extraction procedures resulted in greater numbers of Anguina agrostis juveniles per gram of seed, they failed to yield any nematodes in as many as four seed lots with low infection levels.

Keywords


anguina agrostis; assay; bentgrass; extraction procedures; nematode; orchardgrass; phytosanitary certification; regulatory nematology; seed-borne nematodes; technique

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