Selection of Arabica coffee types resistant to coffee berry disease in Ethiopia

N.A. van der Graaff

Research output: Thesisexternal PhD, WU

Abstract

Descriptive part. A review is given of: the importance of Coffea arabica to Ethiopia; coffee research; habitus, origin and cultivation of C. arabica ; theoretical aspects of resistance and its implications for the system C. arabica -parasites; Coffee Berry Disease, symptoms, epidemiology, geographic distribution, origin, resistance to CBD, chemical control and control through resistance.Experimental part. Coffee trees (mother trees) were selected that showed a low level of CBD in areas with severe disease. The resistance of these trees was appraised through field observations, field inoculation tests, and seedling inoculation tests. Correlations were determined between field observations and tests. Selection thresholds were determined and their adequacy was assessed through longer term observation of the mother trees. Progenies of mother trees were planted in a heavy CBD area; the CBD resistance of the progenies was reassessed through disease estimates and berry counts in the field, and detached berry tests. The correlations between observations and tests were determined as well as selection tresholds for seed distribution to farmers.The nature of CBD resistance was discussed and additional experiments were made on: the rôle of the cuticle, variation in resistance within and between single-tree progenies, and interactions between host and pathogen. It was concluded that resistance was most likely horizontal. In multilocation trials, differences were found between coffee types with regard to leaf rust, leaf blight and blotch leaf miner. Disease and pest severity were related to provenance of the mother trees. Progenies were found to differ in resistance to tracheomycosis. Through field observations on differences in resistance it was possible to determine indirectly that all progenies possessed adequate resistance to brown eye spot. A final evaluation of the programme is presented.
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
Supervisors/Advisors
  • Zadoks, J.C., Promotor
Award date11 Jun 1981
Place of PublicationWageningen
Publisher
Publication statusPublished - 1981

Keywords

  • plant pathogenic fungi
  • coffea
  • coffee
  • plant breeding
  • disease resistance
  • pest resistance
  • economic situation
  • botany
  • ethiopia
  • economic production

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