THE MOSAIC DISEASE OF THE HOP; GRAFTING EXPERIMENTS, I

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Abstract
Summary.: Certain hop plants, which were grafted in 1926 with scions either (a) of plants affected with the mosaic disease, or (b) of the seedling variety M 45 (previously proved to be a “carrier”), produced in 1927 shoots affected with mosaic disease. From the evidence available, it would appear that the virus of mosaic disease can travel down a grafted stem and infect the rootstock. It would appear, further, that mere contact of a virus‐carrying scion with the stock (with no growth of the former taking place) is sufficient to cause the infection of the rootstock. When scions of the commercial variety Fuggles were grafted on a hop plant severely affected with the mosaic disease they remained healthy and completed their full seasonal development.

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