Chronic Leaf Fall in Arabica Coffee in Tanzania

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Date
1967
Authors
Hollies, M. A.
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Abstract
Chronic leaf fall of apparently healthy leaves can be prevented by spraying with copper fungicides, but keeping the foliage dry also gave very good leaf retention, and no evidence was found to suggest that the action of copper was physiological. Spraying seedlings with copper fungicides did not increase the net assimilation rate, and good leaf retention due to spraying did not correspond with higher leaf chlorophyll content. The response to copper spraying did not alter with age of leaf. Since a large number of fungicides of different types was found to be effective in leaf retention it was concluded that chronic leaf fall is probably due to a pathogen rather than any physiological cause. Spore counts of Colletotrichum coffeanum gave erratic results, and further work is required on the fungal populations on coffee to establish the causal organism.
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East African Agricultural And Forestry Journal, XXXII (No. 4), pp. 404-410
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