Abstract
SUMMARYThe growth of Erwinia carotovora var. atroseptica and E. carotovora var. carotovora in stems of potato cultivars Majestic and Red Craigs Royal is reported. At high daily maximum temperatures, all isolates grew logarithmically for varying periods. Thereafter E. carotovora var. atroseptica populations generally increased and incited blackleg, while E. carotovora var. carotovora remained stationary or fell and either failed to incite blackleg or brought about a fast soft rotting (hollowing‐out) of the stems. Growth of either variety, especially of E. carotovora var. carotovora was retarded at lower daily maximum temperatures. There was a reduced growth in Red Craigs Royal compared with Majestic.For the blackleg symptom to appear in Majestic, a threshold population of c. 108 bactcria/g of stem was considered a pre‐requisite.
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