Abstract
Summary. When scions of varieties susceptible to mosaic disease were grafted on German, American, Danish, English and Seedling varieties, they developed typical mosaic disease. It appears, therefore, that “carrier” varieties are common amongst commercial varieties of hops. Certain male hops also proved to be “carriers.” In a few cases susceptible scions grafted on “carrier” stocks remained healthy. These anomalous cases require further investigation. As a rule, the “carrier” varieties show no trace whatever of mosaic disease; the leaves are of normal colour and the plant shows normal growth with high fertility. A case is recorded where one “carrier” variety (Red Vine Canada) exhibited in one season nascent symptoms of disease. The term “masked mosaic” is suggested for the appearance shown. Scions of the commercial variety Fuggles, when grafted on “carrier” plants, invariably remained healthy.
Published Version
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