The Transmission Of “Mosaic” Disease In Hops By Means Of Grafting

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Abstract
Summary.: In these experiments. where susceptible scions have been grafted on to “mosaic” stock, all developed “mosaic” symptoms with one exception. Circumstances were not favourable in this particular case and it. should be regarded as giving indecisive not negative evidence. From the other cases there is satisfactory proof that, the supposed “virus” can be transmitted up the growing bine. With the “carrier” experiments, all the known susceptible sciens, which were grafted on to the “carrier” (M 45) stock, exhibited “mosaic” symptoms. The variety M 45 must, therefore. be regarded as capable of transmitting the disease to susceptible hops, and as being a “carrier.” There is no evidence that the process of grafting can of itself in any way induce “mosaic” symptoms to pear in healthy susceptible hops, or in the “carrier” M 45

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