Abstract
Propagation of potato stocks from stem cuttings has produced material almost entirely free from infection withErwinia carotovora var.carotovora andE. carotovora var.atroseptica: during 1967–74, very few infected plants or tubers were found on the nuclear stock farm. When infection occurred,E. carotovora var.carotovora was the organism most often isolated, whereas in ordinary commercial stocksE. cartotovora var.atroseptica predominates. In 1973 and 1974 dipterous insects caught at a nearby dump of decomposing vegetable matter were contaminated withE. carotovora var.carotovora several weeks before infection was found on potato stems. Serotypes ofE. carotovora var.carotovora isolated from insects and infected plants were very often identical, providing compelling evidence that the source of the organisms was the dump, from which contaminated insects dispersed and subsequently transferred organisms to the crop. The origin of infections withE. carotovora var.atroseptica remains unknown.
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