Fungicides for Arabica Coffee -Phytotoxicity of Cycloheximide

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Date
1967
Authors
Hocking, D.
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Abstract
The use of cycloheximide in coffee clearly presents hazards not present in the use of copper fungicides. Exceeding the effective laboratory dose by a factor of 2.5 causes up to 5 per cent necrosis, and by a factor of ten, complete death of young leaves. Leaf discussed in the experiments reported earlier were cut from the centres of leaves 8-12 weeks old, which explains the absence of phytotoxic symptoms, the present symptoms on older leaves being restricted to tips and edges. Field control with copper fungicides probably requires an average deposit about ten times the effective laboratory dose (Hocking, 1967a). The translaminar action of cycloheximide may enable field control to be achieved with little or no increase in average deposit. However, the danger of local over-deposition, causing phytotoxic symptoms, would still exist. Thus great caution would need to be exercised in application.
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East African Agricultural and Forestry Journal, XXXII (No. 4), pp. 363-364
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