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The Yield of Potatoes Resistant To Heterodera Rostochiensis On Infested Land

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For more content, see Nematology.

Yields of a resistant potato variety bred from Solanum tuberosum ssp. andigena were adversely affected when their roots were invaded by H. rostochiensis larvae of a pathotype unable to multiply in them. Yields were inversely proportional to pre-cropping population density. Populations decreased slowly when the resistant variety was grown continuously but showed a tendency to increase after 4-5 years. There was some evidence that pathotypes 1 and 1,2 increased slightly (pathotypes B and C of other workers) whereas pathotype 2 (pathotype A) remained much the same. The dominant gene for resistance from Solanum tuberosum ssp. andigena, that from S. multidissectum and both together appeared to confer some tolerance to the injury caused by root invasion. Yields after methyl bromide fumigation were so increased that it seemed likely that pathogens other than H. rostochiensis were also controlled. Although a significant linear relationship could be fitted to the relationship between the yield of an experimental resistant variety bred from S. tuberosum ssp. andigena and the logarithm of the pre-cropping population density, the real relationship is probably sigmoid.

Affiliations: 1: Rothamsted Experimental Station, Harpenden, Herts, England


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