Coffee board of Kenya monthly bulletins August 1972

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Date
1972
Authors
Mulinge, S. K.
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Abstract
Colletotrichum coffeanum Noack is a ubiquitous fungus occurring in the mature bark of coffee shoots.In Kenya four culturally distinct strains have been distinguished (Gibbs, 1969) comprising three saprophytic strains, ccp, cca, ccm, and a pathogenic strain causing coffee berry disease (CBD). The abundance of the CBD strain in the bark is of obvious importance in the epidemiology of the disease since at certain critical times of the year the bark is the main inoculum source for initiation of primary infections (Griffiths, Gibbs & Waller, 1971). Several factors are now known to influence the abundance of the CBD strain in the bark, notably fungicides (Furtado, 1969), cultivar (Mulinge, 1970) and altitude (Mulinge, 1971).In these studies estimates of the CBD strain were made on random samples of coffee branches and little or no attention has so far been given to possible variations which may occur within the tree.However, the existence of significant variation in inoculum production within the tree canopy could have important implications in relation to both spraying and pruning systems.
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Monthly Bulletin
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