If you are a cannabis grower, one of the things that you most fear are viruses that may harm and damage your crops. It is perfectly understandable to feel that way since these viruses can really hurt and destroy your plants, after all the hard work and effort that you have invested.  Here are some examples of the most common viruses that infect cannabis plants: HSV or hemp streak virus - a common virus on cannabis plants in Europe - typical symptoms include the appearance of pale ...