Abstract
Breakdown of newly sown seed tubers in semi-arid irrigated sands was shown to be caused byErwinia carotovora var.carotovora andE. chrysanthemi. The soil-borne bacterial population appeared to be more important than seed tuber population in initiating rots in soil. Pectolytic activity of tuber-borne bacteria in an anaerobic environment increased with increasing temperature; there was comparatively little rotting below 25°C. Average percentage weight loss of tubers was approximately seven times greater when they were dip-or puncture-inoculated withE. chrysanthemi than withE. carotovora. Control measures should perhaps be based on protection of the newly planted seed tuber rather than on development of clean seed sources. This is the first report ofE. chrysanthemi caused soft-rotting of potato tubers.
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