Effects of Fungicides and the Populations of Colletotrichum and Other Fungi in Bark of Coffee

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Gibbs, J. N.
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The effects of copper, cap 01 and Tuzet, applied to coffee in early season (January to April) and in other programmes continuing through the long rains (January to July), on t e bark populations of Colletotrichum coffeanum Noack. (the pathogenic CB strain and the saprophytic ccm, cca and ccp strains), Phoma spp., Fusarium stilboides Wollenw and a Phomopsis sp. Were investigated on branch material from field experiments in Kenya in 1968 and 1969 by a plating technique which estimated sporulating capacity (s.c.) Fungicide application initially caused a non-specific reduction in s.c., Tuzet being the most effective. With the onset of the long rains this general reduction was not maintained, although during the period between the long and short rains the levels of many fungi in sprayed plots were still below those in the unsprayed control. In contrast, the S.C. of Phoma in plots sprayed with copper and of Phomopsis in these sprayed with Tuzet were higher than on unsprayed plots. The S.C. of the CBD strain was below that in the control only in plots sprayed with captafol.
Annals of Applied Biology, 70, pp. 35-47