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- Title
Studies on silvering disease of red beet.
- Authors
KEYWORTH, W. G.; HOWELL, J. SHEILA
- Abstract
SUMMARY Observations and experiments were made on silvering disease of red beet during the period 1952-59. The disease is most prevalent on seed crops of the variety Cheltenham Green Top, but also affects other cultivars of Beta vulgaris, often only mildly. The causal organism is Corynebacterium betae sp.nov. which can be found in the tap-roots, stems and leaves of systemically affected plants causing veinal or uniform silvering of the leaves followed by wilting and death of the plant. External leaf infection gives rise to silvered lesions on the laminae or leaf margins. About 1% of the seeds from infected plants contain the pathogen and these seeds give rise to plants showing systemic symptoms. The bacteria spread from such plants in the seedling bed during the autumn and winter, probably entering other plants through their leaf edges. Such spread can occur to distances of at least 50 yards, and the planted out seed crop may be up to 75% infected. The disease is readily transmitted on knives which have cut infected roots. Seed treatment with streptomycin or erythromycin (200-400 g/ml.) gives almost complete control of the disease. Mercurial dusts are less effective but have been found of some value in practice.
- Publication
Annals of Applied Biology, 1961, Vol 49, Issue 1, p173
- ISSN
0003-4746
- Publication type
Article
- DOI
10.1111/j.1744-7348.1961.tb03601.x