Seed potato certification programs utilize a number of mechanisms to ensure quality seed is produced within the guidelines and regulations established by the certifying authority. One important component is a post-harvest test (PHT). The primary focus of this test is to detect and estimate any current season spread of virus, primarily Potato Virus Y (PVY or Mosaic) and Potato Leaf Roll Virus (PLRV) that may have occurred during the summer growing season.
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