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Scanning electronic microscope observations of Pst urediniospore infection by A. alternata. (A) 24 h after inoculation, the A. alternata germ tube contacted with Pst urediniospore; (B) 36 h after inoculation, an A. alternata germ tube penetrated into a urediniospore; (C,D) 48 h after inoculation, the hyphae of A. alternata directly penetrated through the urediniospore.
