All our hop lines have tested negative for carlavirus (by RT-PCR), hop downy mildew (by PCR) (Pseudoperonospora humuli) including systemic downy mildew, hop stunt viroid (HSVd), Arabis mosaic nepovirus (ArMV), apple mosaic ilarvirus (ApMV). The carlaviruses tested include Hop latent carlavirus (HpLV) and Hop mosaic carlavirus (HpMV). Plants are tested annually by our laboratory provider, University of Guelph, Agriculture and Food Laboratories, Guelph, ON.