Susceptibility of the main alternate hosts of Cronartium flaccidum, Vincetoxicum spp. and Melampyrum spp., to C. ribicola was investigated by artificial inoculations on detached leaves in the laboratory and on whole plants in the greenhouse. Neither uredinia
nor telia developed on the leaves of either Vincetoxicum hirundinaria, Vincetoxicum nigrum, Melampyrum sylvaticum, Melampyrum pratense, Melampyrum nemorosum, Melampyrum arvense, Melampyrum cristatum or Melampyrum polonicum following inoculation
by the 26 aeciospore sources collected from Pinus strobus, Pinus monticola, Pinus flexilis and Pinus peuce in 2000–2003. The results suggest that Finnish C. ribicola does not infect the main alternate hosts of C. flaccidum. Cronartium ribicola
and C. flaccidum can thus be identified reliably by inoculations on their main alternate hosts.
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Document Type: Research Article
Finnish Forest Research Institute, Rovaniemi Research Unit, PO Box 16, FI–96301 Rovaniemi, Finland.
Finnish Forest Research Institute, Vantaa Research Unit, Vantaa Unit, PO Box 18, FI–01301 Vantaa, Finland
Publication date: 2006-08-01