Abstract
SUMMARYRecent outbreaks of hop black root‐rot in England are described in relation to the disease in New Zealand and to previous records in this country.Rates of growth along detached hop storage roots were compared for several isolates of Phytophthora citricola from hop and other host plants. Isolates from New Zealand hops and recently diseased plants in England could not be distinguished from one another, but the original English isolate, obtained in 1942, appeared to be a distinct strain. A number of commercial cultivars exhibited differential responses to infection by the fungus in both detached root and entire rootstock inoculations. The cultivars Northern Brewer and Progress were amongst the most resistant.
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