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Screening potato clones for resistance to common scab (Streptomyces scabies) in the field

Published online by Cambridge University Press:  27 March 2009

F. A. Langton
F. A. Langton
Affiliation:
Plant Breeding Institute, Cambridge, CB2 2LQ*
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Summary

Potato varieties were grown in the field in soil uniformly infected with Streptomyces scabies. In 1969 tubers were severely and evenly infected but in 1971 infection was slight and not uniform. Agreement of varietal ranking with agricultural experience was good in 1969 but poor in 1971.

In 1971, plots protected from rainfall after planting were dry enough at the start of tubering for severe infection; covering the plots for a further 6 weeks followed by irrigation to field capacity resulted in good yields of evenly and severely scabbed tubers. Irrigation during this period suppressed scabbing. The results were easily interpreted in relation to fluctuations in soil-water content measured by a neutron moisture-meter.

The efficiency of using only one site and the need to reduce variability in scab screening tests are discussed.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 79 , Issue 1 , August 1972 , pp. 75 - 81
Copyright
Copyright © Cambridge University Press 1972

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