Hop latent viroid (HLVd)
The viroid infects hop plants and does not cause symptoms. However, infected plants contain a lower concentration of alpha acids which are important for brewing.
secondary structure of Hop latent viroid, black nucleotides are of low reactivity, orange ones of intermediate and red ones of high reactivity, for more details see the original publication (click on image to enlarge it)
Author(s): Tamara Giguère and Jean-Pierre Perreault
Source: PLoS ONE (2017) 12, e0182536