Abstract

English

Highlights

  • Coffee berry disease (CBD) caused by Colletotrichum kahawae Waller and Bridge is the most serious disease of Arabica coffee (Coffea arabica L.) in Tanzania

  • The study results revealed that CBD resistance of Lyamungu coffee hybrids is partly being contributed by wax surface on green coffee berries

  • The nature of resistance of Lyamungu coffee hybrids to C. kahawae strains was confirmed to have been influenced by surface wax from green berries of C. arabica genotypes and deposition of polysaccharide materials at the sites of attempted penetration by the pathogen

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Summary

Introduction

Coffee berry disease (CBD) caused by Colletotrichum kahawae Waller and Bridge is the most serious disease of Arabica coffee (Coffea arabica L.) in Tanzania. According to the history of CBD, the genetic resistance appeared complete in Coffea canephora and partial in C. arabica. Hocking [11] demonstrated that there is a notable variation in CBD resistance within coffee varieties. Mulinge [16], on the other hand, found out that the susceptibility of berries to CBD varies with the age of the crop; berries are most susceptible when they are between 4th and 16th weeks after flowering, and at ripening stage but pin heads and hard mature berries (≥ 16th week) are resistant. Differences in the resistance of coffee trees to CBD are frequently observed under laboratory and field conditions. The high levels of resistance were found in Rume Sudan [32-34]

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