Correlation between intercepted radiation and yield of potato crops infested by Phytophthora infestans in central Africa

Abstract

It became apparent from chemical late blight control data on large numbers of genotypes of the Rwandese late blight screening programme, that yields were linearly related to the amount of intercepted radiation by the crop. Measures which affected the total amount of intercepted radiation such as the use of contact and systematic fungicides, or of different genotypes, did not affect the radiation use efficiency of the canopy. Genotypes that started to tuberize at relatively low values of intercepted radiation partly escaped the effect of late blight infection of the foliage on tuber yields. This characteristic could be useful to identify early late blightresistant genotypes for central Africa, where farmers grow two crops per year and earliness is required.

Samenvating

De chemische bestrijding van de aardappelziekte in grote aantallen genotypen van het Rwandese veredelingsprogramma voor aardappelziekteresistentie heeft aangetoond dat opbrengsten zich lineair verhouden tot de hoeveelheid door het gewas opgevangen zonnestraling. Maatregelen die van invloed waren op de totale hoeveelheid opgevangen straling, zoals het gebruik van contact- of systemische schimmelbestrijdingsmiddelen, of van verschillende genotypen, waren niet van invloed op het rendement van het gebruik van zonnestraling door het blad. Genotypen die een knolaanleg vertoonden bij verhoudingsgewijze lage waarden van opgevangen straling, ontsnapten gedeeltelijk aan het effect van bladaantasting op knolopbrengst. Dit kenmerk zou van nut kunnen zijn om vroege genotypen te zoeken met resistentie tegen de aardappelziekte in centraal Afrika, waar vroegheid van belang is omdat boeren twee gewassen per jaar telen.

This is a preview of subscription content, access via your institution.

References

  1. Allen, E.J. & Scott, R.K., 1980. An analysis of the growth of the potato crop. J. agr. Sci. (Cambridge) 92: 151–163.

    Google Scholar 

  2. Bicamumpaka, M. & Devaux, A., 1984. Programme de sélection au Rwanda pour l'obtention de variétés résistantes au mildiou (Phytophthora infestans) et à la bactériosePseudomonas solanacearum). Abst. 9th triennal, Conf. EAPR (Interlaken): 330–331.

  3. Burstall, L. & Harris, P.M., 1983. The estimation of percentage light interception from leaf area index and percentage ground cover in potatoes. J. agr. Sci. (Cambridge) 100: 241–244.

    Google Scholar 

  4. Devaux, A., 1984. Différents aspects du contrôle du mildiou de la pomme de terrePhytophthora infestans par l'utilisation des fongicides. Note Technique ISAR (Rwanda) 3, 31 pp.

    Google Scholar 

  5. Devaux, A., Haverkort, A.J. & Mukamanzi, S., 1985. Etude comparative de la production de la pomme de terre en fonction des dates de plantation et de l'utilisation du paillis. Bull. Agr. du Rwanda 18: 166–173.

    Google Scholar 

  6. Haverkort, A.J., 1985. Relationships between intercepted radiation and yield of potato crops under the tropical highland conditions of central Africa. Ph.D. thesis University of Reading, 259 pp.

  7. Khurana, S.C. & McLaren, J.S., 1982. The influence of leaf area, light interception and season on potato growth and yield. Potato Res. 25: 329–343.

    Google Scholar 

  8. Scott, R.K. & Wilcockson, S.J., 1978. application of physiological and agronomic principles to the development of the potato industry. In: P.M. Harris (Ed.), The potato crop; the scientific basis for improvement. pp 678–703. Chapman & Hall London.

    Google Scholar 

  9. Spiertz, J.H.J., Heemst, H.J.D. van & Penning de Vries, F.W.T., 1984. Modelling growth and production of Potatoes. Proc. 9th Conf. EAPR (Interlaken): 99–113.

  10. Turkensteen, L.J., 1984. Survey of potato diseases in central Africa. Rapport Annuel du PRAPAC (Ruhengeri, Rwanda), 1984, 41–51.

Download references

Author information

Affiliations

Authors

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Haverkort, A.J., Bicamumpaka, M. Correlation between intercepted radiation and yield of potato crops infested by Phytophthora infestans in central Africa. Netherlands Journal of Plant Pathology 92, 239–247 (1986). https://doi.org/10.1007/BF01977690

Download citation

Additional keywords

  • Late blight score
  • fungicide
  • radiation use efficiency