INFECTION TESTS WITH TWO CAULICOLOUS RUSTS OF JACK PINE IN SASKATCHEWAN

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Abstract
The identity of Peridermium stalactiforme Arth. & Kern and its occurrence on Pinus banksiana Lamb, in Saskatchewan are established. Melampyrum lineare Desr. and Castilleja rhexifolia Rydb. were infected with this rust experimentally. For the first time, C. rhexifolia was discovered to be naturally infected with a species of Cronartium. The minimum period from inoculation to production of mature spores was 14 days for uredinia and 16 for telia. In 18 experiments, 17 inoculations on C. rhexifolia produced sparse infection in 30 of the 37 clusters inoculated, and 6 inoculations of Melampyrum lineare plants produced more severe infection in 48 out of 97 plants. In contrast, 59 experiments with Peridermium harknessii J. P. Moore involving 109 inoculations of 1344 M. lineare plants and 48 clusters of Castilleja rhexifolia failed to produce infection, indicating that these suspects are not hosts of P. harknessii.

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