Production of uredinia and telia by Cronartium coleosporioides
Investigations were conducted in British Columbia, Canada, to study the impact of climatic conditions on the production of uredinia and telia on alternate hosts by Cronartium coleosporioides (EPPO A1 quarantine pest). Aeciospores from different locations of British Columbia were collected and inoculated on Castilleja miniata, an alternative host of the rust fungus. It was found that rust collected from dry areas did not produce uredia and may have lost the ability to do so. Rusts from wetter areas produced uredia or mixtures of uredia and telia. The authors suggested that the loss of the uredial stage may be in response to climates that are often unsuitable for the spread or survival of the rust on alternative hosts.
Sources
Van Der Kamp, B.J. (1993) Production of uredinia and telia by stalactiform blister rust in British Columbia.
Canadian Journal of Botany 71, 519-521.