Abstract
Some mother tubers rotted as early as July and most were extensively rotted by the end of August.Erwinia carotovora var.carotovora andE. carotovora var.atroseptica were frequently isolated from them and from the soil in their vicinity. Daughter tubers became contaminated only after the rotting mother tubers had liberated bacteria into the soil. By the end of August and early September most of these were contaminated. Moreover, the absence of contamination in progeny tubers of pot and field grown plants without mother tubers in contrast to its presence where mother tubers were present further supports the view that the seed tuber is the main source of contamination byE. carotovora in potato crops in Scotland.
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