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Influence of planting seed tubers with gangrene(Phoma foveata) and of neighbouring healthy, diseased and missing plants on the yield and size of potatoes

Published online by Cambridge University Press:  27 March 2009

G. A. Hide ,
S. J. Welham ,
P. J. Read  and
A. E. Ainsley
G. A. Hide
Affiliation:
IACR-Rothamsted, Harpenden, Herts AL5 2JQ, UK
S. J. Welham
Affiliation:
IACR-Rothamsted, Harpenden, Herts AL5 2JQ, UK
P. J. Read
Affiliation:
IACR-Rothamsted, Harpenden, Herts AL5 2JQ, UK
A. E. Ainsley
Affiliation:
IACR-Rothamsted, Harpenden, Herts AL5 2JQ, UK
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Summary

Potato seed tubers infected or not infected with gangrene (Phoma foveata) were planted at Rothatnsted in 1987 to measure the effect of the disease and of neighbouring plants on yield. The experimental design was constructed so that the effect on growth of six adjacent plants (two nearest neighbours in each direction within rows and one nearest neighbour in each direction across rows) could be estimated for each plant. Total yield, ware (> 150 g) yield and tuber number from individual plants were affected most by the disease but also, in decreasing importance, by the two plants on either side within the same row (first neighbours), the two plants adjacent to the first neighbours (second neighbours) and the two adjacent plants in the rows on either side. Yield and tuber numbers increased as the different combinations of neighbouring plants contained increasing proportions of plants from diseased seed and missing plants; plants compensated for decreasing competition. Tuber size distributions showed that numbers of ware tubers decreased with increasing competition whereas numbers of small tubers were less affected. The fitted model was used to predict yields from crops planted with different proportions of diseased or missing seed tubers.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 125 , Issue 1 , August 1995 , pp. 51 - 60
Copyright
Copyright © Cambridge University Press 1995

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