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Blister Rust Susceptibility Studies of Naturally Pollinated Seedlings of the Immune Viking Currant

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Abstract:

Currants and gooseberries are known to be susceptible in general to white pine blister rust (Cronartium ribicola Fischer). Within recent years, however, two red currant garden varieties have been investigated extensively and proved to be immune. In Germany, Tubeuf at Munich has proved the variety Rote Holländische to be immune from blister rust over a period of five years, 1928 to 1932. For a longer period, 1928 to 1937, the writer has demonstrated a related variety, the Viking, to be also immune from blister rust in Europe and North America. Seedlings of Viking propagated from seed collected from naturally pollinated bushes growing both where the possibility of cross-pollination with susceptible red currants was not excluded and where such cross-pollination seemed unlikely, produced a very large percentage of rust-immune plants and only a comparatively small percentage of susceptibles. The majority of the latter were weaklings. Among those showing vigorous growth, two were highly susceptible whereas the remainder were highly resistant to rust. To determine whether these susceptibles are fertile or sterile needs further investigation.

Document Type: Journal Article

Affiliations: U. S. Bureau of Plant Industry

Publication date: 1938-08-01

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